Author Topic: Bosch Uneo External Battery Modification  (Read 13172 times)

Offline jarvist

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Bosch Uneo External Battery Modification
« on: July 09, 2011, 04:06:24 am »
I just modified another Bosch Uneo for bolt climbing use this summer, and took a good few photos of the pristine gearbox + my modifications, to help anyone else that decides to get one themselves.

http://www.flickr.com/photos/jarvist/sets/72157627025564123/

I choose to remove the internal lithium ion batteries entirely, and put it on a ~1.3m extension lead so you can directly use a battery in a SRT bag clipped to your chest harness without any extra leads.

The reason I'm having to do another is that our first Uneo died an unlikely death, possibly after being wired up backwards to the battery. Certainly something is wrong with the logic board, it's too clever by half. Drills should not have a 'Software Version'!
We also had a very irritating issue last summer in our 1C caves where the drill would refuse to run off cold NiMh batteries, instead just lighting up the 'low battery' red LED and refusing to put any juice into the motor.

The obvious thing to do is hot wire the blessed thing, which is what I intend to do with our 'broken one'. It's slightly complicated as the MOSFET to drive the motor is on the big PCB and the usual variable speed control has extra leads (again, going to the PCB!). If I succeed in driving a stake through it's over protective brain I'll report back here on such a positive modification. I thought it was a complicated (to drive) brushless motor, but this is not true.

So, overall the Uneo is pretty finicky (if you're not familiar with them, they also have odd and not widely available SDS-quick bits), but you can't get a lighter, or more pleasing to hold 1-handed & outstretched, drill for love nor money, and certainly not the £60 or so that you can pick up an 8mm-'concrete bit' Uneo for.

A load of people on ukcaving + a Spanish caver I found on Youtube were really helpful when I did this for the first time last year, but I can't remember their names off the top of my head!

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #1 on: July 09, 2011, 04:12:02 am »
+ I did a Makita BHR162 (available naked for ~£110) earlier this week:

http://migovec.posterous.com/makita-bhr162

Very front heavy with no external battery!
Super powerful though, turn it on too quick and it'll twist your wrist. The pneumatic action has a hell of a kick.

Offline sluka

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Re: Bosch Uneo External Battery Modification
« Reply #2 on: July 09, 2011, 09:44:24 am »
the drill would refuse to run off cold NiMh batteries

Sorry, but why you don't use the LiIon pack?

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #3 on: July 09, 2011, 10:47:57 am »
the drill would refuse to run off cold NiMh batteries
Sorry, but why you don't use the LiIon pack?

We didn't have any sensible way to charge them, and the 2.4Ahr (?) capacity of the tiny 18650 cells seemed a bit trivial to bother making them into external batteries. The substitution, on expedition, was simply to use our alternative 5Ah 12V lead acids. Their voltage goes up as the temperature drops.
This year we also have a 12-cell (14.4V nominal) NiMh Sub-C pack made up.

Now that I've got 8 Li-ion cells doing nothing, I might make them up into an external pack and see if I can charge them without them blowing up. On the last Uneo I left the wall-wart connector in, so that one could use the internal circuitry to charge up the Li-ions normally via the external fly leads (but without the temperature sensors doing anything useful...). But it quickly clogged with mud anyway, and seemed to let a lot of dust into the drill body.

Skua, are you the guy who advised me last year + who had left his internal batteries in, and brought three leads out? (battery +ve, motor +ve, common -ve?) It was a very sophisticated + well thought out way to both internal + external batteries depending on situation. For our use on expedition (charging off Solar PV) and with a mix of cavers who won't necessary understand the electrical subtleties (and could choose to short an external battery to the internal lithiums), I believe making it a wholly battery-less drill is the best solution.

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #4 on: August 15, 2011, 08:52:34 pm »
Just to comment that with a 3.7Ahr 14.4V Sub-C cell battery pack from component shop (£30) we were reliably getting 12-15 8mm bolt holes (at almost the full length of the SDS-quick 8mm drill bit the Uneo comes with), in our 1-5 degrees C warm cave environments.
This seems considerably more efficient for bolting than other, larger & more powerful, drills we've used.

Off 5Ahr lead acids (which are nice and nearly cuboid) we were getting ~10 bolts, though there was still charge left in the battery -- the voltage had just got too low for the Uneo to play.
 
We also found that you could warm up a battery (such as the lead acids after a couple of bolts had been taken out of them) when the Uneo was complaining that the voltage was low + cutting out:
* drill into space for the ~2s you get before the Uneo cuts out with the red 'low battery' light,
* quickly release and squeeze the trigger to drill for another 2s of drilling,
* repeat until the voltage picks up enough for continuous drilling, then place your bolt.

For next summer's expedition we'll be purchasing some more NiMh batteries from 'component shop', and looking into hot-wiring the broken Uneo.
 
As it's relatively modestly powered, there shouldn't be any problem with just having a simple 'on/off' switch and a MOSFET to drive the motor.

Offline Al.

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Re: Bosch Uneo External Battery Modification
« Reply #5 on: August 22, 2011, 04:18:01 am »
Einhell makes as similar sized drill to the Uneo that it takes real ADS bits:
<http://www.einhell.com/englisch/englisch.aspx?file=elektrowerkzeuge&lang=en>
What's more, it doesn't have any 'intelligent' hardware in it, so it's easy to hotwire.
They really are very good for bolting, but lack the power of a bigger drill.

Offline sluka

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Re: Bosch Uneo External Battery Modification
« Reply #6 on: August 22, 2011, 06:42:56 am »
Einhell: Weight   3 kg  :confused:

Offline Al.

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Re: Bosch Uneo External Battery Modification
« Reply #7 on: August 23, 2011, 03:54:21 am »
From their webpage:

Technical Data
Battery   14,4 V, 1.400 mAh
Max. torque   12 Nm
Idle speed   0-800 min-1
Impact rate   0-4500 min-1
Impact power   1,0 J
Drilling capacity concrete   10 mm
Charging time   3-5 h
Product weight   1,3 kg :-)
__________
& that's *with* battery




Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #8 on: August 23, 2011, 03:56:41 am »
Einhell: Weight   3 kg  :confused:
If we're talking about the Einhell Blue BT-HD (thing looks almost identical to an Uneo), that's the logistical, i.e. box, weight. The product weight is 1.3kg.
Which is probably about right if the internals are the same more or less as the Uneo but it has a larger chuck.

However, I'd be very surprised if there was no clever electronics in there, it boasts a variable speed control & integrated battery charging, which is exactly what the Uneo does. Has anyone actually adapted this for caving yet?

At a 'bare drill' list price of 61 Euros it's certainly worth investigating!

I'm not sure if these links will work for long, or at all, but anyway:
1 page PDF English brochure:
http://www.isc-gmbh.info/download/prod/35751538/4513470_01019.pdf
German technical manual showing the battery attachment:
http://www.isc-gmbh.info/download/prod/35751543/4513470_01019_SPK5.pdf

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #9 on: August 23, 2011, 04:12:13 am »
Just for completeness, here's the Uneo. Technical Data.:
Max. drilling diameter in concrete 10 mm
No-load speed 0–900 rpm
Impact rate 0–4,800 bpm
Single impact force 0.9 J
Impact stop Yes
Forward/reverse operation Yes
Pneumatic hammer mechanism Yes
Battery voltage 14.4 V
Battery capacity 1.3 Ah
Charging time 3 h
Battery charge level indicator Yes
Weight including battery, approx. 1.1 kg
Carrying case Yes

Offline sluka

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Re: Bosch Uneo External Battery Modification
« Reply #10 on: August 23, 2011, 06:21:22 am »
Einhell: Weight   3 kg  :confused:

Sorry it is all the case. Price is half or less than Uneo. SDS Plus - very interesting.

Offline Chocolate fireguard

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Re: Bosch Uneo External Battery Modification
« Reply #11 on: August 23, 2011, 08:47:49 am »
Just for completeness, here's the Uneo. Technical Data.:
Single impact force 0.9 J

Am I the only one who gets depressed by this sort of stuff coming out as "technical" data?

Offline Al.

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Re: Bosch Uneo External Battery Modification
« Reply #12 on: August 24, 2011, 04:12:19 am »
"Has anyone actually adapted this for caving yet?"

Yes

The supplied battery pack is pathetic. Good for 5-7 spits.

I cut off the front part of the handle that only houses the battery pack and fitted a power cable. I've run it on a variety of lithium battery packs and even a 12 V SLA by accident. It ran a little slow, but was still faster than hand-drilling the spit.

So far it's done ~150 spit holes and a few minor shot holes.

It drills slower than my old 12 V Makita, but it really isn't a big deal spending 30 seconds instead of 15 seconds to drill a bolt hole. It's under half the weight and size.

A nice exploration caving toy.

I've also seen a Chinese clone in red plastic bearing 'Taurus' stickers instead of 'Einhell'

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #13 on: August 24, 2011, 03:54:44 pm »
The SDS-plus makes it interesting indeed!
Mind you, the Uneo 8mm SDS-quick concrete bits are really nice for 8mm rawls, and it makes the overall length of the drill + bit really quite short, which is useful for bolting in rifts.

Is there a UK supplier for this Einhell drill?

The Uneo's RRP may be £129.99, but it's typically available for £60-90.

Offline hrock

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Re: Bosch Uneo External Battery Modification
« Reply #14 on: August 27, 2011, 07:37:34 pm »
when i did mine i managed to get a lead from the battery's out of the air vent in the handle then fitted the power in plug to come out the charging plug hole. it means i can run it on my 12v mnhi packs or 14.4 lopo packs and it can still be used for bits and bobs and the odd bolt on its internal batterys.

but there is no need now

http://www.amazon.co.uk/gp/product/B0047O2AR6/ref=s9_simh_gw_p60_d5_g60_i1?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=1JPPE82CN5A7MBQEYJBR&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294



faulty since production (can't spell) (spell chequed by chris)

Offline sluka

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Re: Bosch Uneo External Battery Modification
« Reply #15 on: September 13, 2011, 04:22:03 pm »
Just new one:

Bosch GBH 14,4 V-LI Compact Professional

1.8 kg, SDS+

Offline Roger W

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Re: Bosch Uneo External Battery Modification
« Reply #16 on: September 13, 2011, 05:24:00 pm »
"but there is no need now

http://www.amazon.co.uk/gp/product/B0047O2AR6/ref=s9_simh_gw_p60_d5_g60_i1?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=center-2&pf_rd_r=1JPPE82CN5A7MBQEYJBR&pf_rd_t=101&pf_rd_p=467128533&pf_rd_i=468294"


The blurb says "It can be frustrating to work in poorly or partly lit areas, but the Uneo Maxx solves this problem with the integrated PowerLight, which ensures the work piece is always visible."

Just the job for drilling holes in cave walls!

No customer review yet though...
"That, of course, is the dangerous part about caves:  you don't know how far they go back, sometimes... or what is waiting for you inside."   JRR Tolkein: "The Hobbit"

Offline cavermark

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Re: Bosch Uneo External Battery Modification
« Reply #17 on: November 15, 2013, 02:16:59 pm »
There is now this version with changeable battery 1.5Ah. Only 10.8 volt though, do people reckon it would be up to the job...

http://www.bosch-do-it.com/gb/en/diy/tools/uneo-3165140668767-199883.jsp#tab_technical

Offline drillbattery

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Re: Bosch Uneo External Battery Modification
« Reply #18 on: June 07, 2014, 05:32:47 am »
There are wide selection of replacement BOSCH cordless drill batteries that are compatible with specific BOSCH power tool models. You can buy with confidence that BOSCH power tooll batteries from UK drill battery will have a long life at a great price. All BOSCH cordless drill batteries Brand New, 1-Year Warranty!

If you need any model, please go to find at http://www.drillbattery.co.uk/batteryplus.php/bosch_power-tool-battery.html

Offline Bottlebank

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Re: Bosch Uneo External Battery Modification
« Reply #19 on: June 09, 2014, 09:43:18 am »
At least I'm a caver that also sells power tool batteries :-)
Drill and Power Tool Batteries - www.power-tool-battery.co.uk
Laptop spares and repairs - www.laptopbits.co.uk

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #20 on: July 25, 2017, 09:44:56 pm »
Hi, I know this is an old post but I want to ask you what is your experience with this Bosch Uneo drill? Have you ever tried to drill holes with its original battery and how it works? I want to buy one I am already thinking how to modify it to work on external batteries. Any chance to post some schematics or instructions what modifications you made it to work on external batteries. Thanks

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #21 on: July 25, 2017, 10:17:40 pm »
With the old Uneo we did a lot of very good work. For drilling 8mm through bolts I cannot imagine anything better. With a bit of forcing you can get an Uneo into a standard 6 L Daren drum, and then store the metalwork and batteries alongside. Under a kg and with a light hammer action, I found I could place bolts at full extension one-handed. Unfortunately, since 2011 all of our Uneos have slowly died. Certainly they are not as rugged as a full-blown commercial SDS-plus drill, such as the (identical voltage) Makitas we now mainly use. But I have to use two hands to place a bolt with the Makitas.

One of our club members ('potholer' on here) took one of the dead-electronics Uneos and replaced the electronics with a much simplified mechanism. Unfortunately, upon the last reassembly of the case, a wire ripped out of the reversal switch, so it needs some more fettling.

I never tried bolting with the built in battery, I would guess from the capacity you might get 4-5 8 mm through bolts, which would perhaps suffice.

I'm not sure if I ever wrote any explicit instructions for the Uneo. A major issue is that when you open up the Uneo, the gear box comes apart as well, and you have to seat it all back together in one. This involves pulling the chuck forwards, and constructing the pneumatic section in the correct order.

Here's a photo showing a Makita and an Uneo open at the same time - full size Makitas are much easier to work on:
https://migovec.files.wordpress.com/2011/06/img_0005-scaled-1000.jpg

Also my most watched video on Youtube (!) is one of the working mechanism with the case open, which might be useful when reconstructing.

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #22 on: July 25, 2017, 10:20:12 pm »
+ I did a Makita BHR162 (available naked for ~£110) earlier this week:

http://migovec.posterous.com/makita-bhr162

Very front heavy with no external battery!
Super powerful though, turn it on too quick and it'll twist your wrist. The pneumatic action has a hell of a kick.
Up to date link. (Postereous shut down.)

https://migovec.wordpress.com/2011/07/06/makita-bhr162/

Offline MarkS

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Re: Bosch Uneo External Battery Modification
« Reply #23 on: July 26, 2017, 09:17:42 am »
This page has some info on using drills with external batteries. It's not the Uneo, but I'd expect the general principles to be the same for any Li-ion drill.

http://durmitor.yucpc.org.uk/misc/drill_batteries.php

Offline Rob

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Re: Bosch Uneo External Battery Modification
« Reply #24 on: July 26, 2017, 09:43:34 am »
...
I never tried bolting with the built in battery, I would guess from the capacity you might get 4-5 8 mm through bolts, which would perhaps suffice.
...
I have the Uneo that has a small (1.5Ah) removable battery, which looks like this:



I take a spare battery, and generally get between 5-7 through bolts (8mm x 75mm) per battery. I really like it, especially it squeezing into a 6L drum. Great around the house too. Main downside is the batteries are expensive (~£50 for Bosch, ~£20 for fake).
The end is where we start....

Offline jarvist

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Re: Bosch Uneo External Battery Modification
« Reply #25 on: July 26, 2017, 10:23:49 am »
Rob's 'new generation' Uneo looks almost perfect, if it can still fit in a 6L drum. (Do you take the battery off to squeeze it in? With the standard Uneos we had to deform the mouth slightly to get it to squeeze through.)

If it's not too much effort, would you mind weighing your Uneo on some kitchen scales? The 1st gen Uneo with internal batteries removed + an extension cord added was ~900 g, which made it delightful to bolt climb with!

Offline Rob

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Re: Bosch Uneo External Battery Modification
« Reply #26 on: July 26, 2017, 08:19:01 pm »
My Uneo with battery is 1272g

Battery is 157g
The end is where we start....

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #27 on: July 26, 2017, 10:00:14 pm »
Thank you all for detailed replies. We already have one Makita, but we want something smaller to reduce weight when we go underground and when we need to put a few bolts only. Also this Bosch Uneo is cheaper than any Makita, at least here in Serbia. I will definitely check everything that you linked here, and if we buy this or anything else and modify it, I will post here of course.
Thanks again. :thumbsup:

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #28 on: December 18, 2017, 08:57:56 pm »
Hi. Here is update for my last post above. We bought one used Bosch Uneo and after a few days of reading and studying on internet about this modification I tried it today. Below are the photos how I did this. I used instructions from three different sources, one from here of course, one Spanish from youtube and one Italian.
And although I did everything as I saw I have problem to make this Uneo working with this sealed lead-acid  12V 7Ah battery. It just want start. When I connect it on its original Li-ion batteries Uneo start working. I check the voltage on lead acid battery and it is 13.7V and on original Li-ion is 15.3V. Does anyone knows what may be the problem? I put cable with two wires of 1.5mm2 and length about 1.7m. I also used one 6A diode on positive end to avoid destroying of electronic if  accidentally connected to different battery ends.I saw this on that Italian website.
So...anyone have a solution? :D


Offline Minion

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Re: Bosch Uneo External Battery Modification
« Reply #29 on: December 18, 2017, 11:58:20 pm »
There will be a voltage drop across the diode of about 0.7v too.

Not sure what voltage the Ueno runs at or what voltage the battery protection circuits may cut in.

Have you measured the voltage at the terminals of the motor?

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #30 on: December 19, 2017, 05:37:20 am »
I will check what is tge voltage on motor. Thanks. I also forget to mention for people who doesn't know that Uneo run son 14.4V but it also works with this modification on 12V. I will also try it without that diode and see if it will work. Thanks!

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #31 on: December 22, 2017, 09:19:21 pm »
Update from he last post:
I removed diode from Uneo because I don't want this voltage drop as it now works on 12V battery. Problem because Uneo didn't work was bad battery. I borrowed that battery to try it from a friend who told me that it was good but he was wrong obviously. :D
We now got the new battery which is lead acid 12V 7Ah and we will see in a few days,I hope, how many holes can we drill. I also make a backup battery from its original Li-Ion batteries when we need to put only 2-3 8mm bolts.

Offline maxf

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Re: Bosch Uneo External Battery Modification
« Reply #32 on: December 22, 2017, 09:50:30 pm »
Would it be possible for you to video your tests ? I'm interested to see how quickly and easily it drills one hole..

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #33 on: December 22, 2017, 10:30:26 pm »
Of course. I will record videos with both batteries to see the difference. When I test it unloaded I noticed that it was a bit slower with 12V batteries which is normal.

Offline Minion

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Re: Bosch Uneo External Battery Modification
« Reply #34 on: December 23, 2017, 10:16:47 am »
Glad it’s working now!

Running at a lower voltage will mean an increase in current, and an increase in heat. Just be mindful you don’t overheat the motor and damage it.

Those stickers are cool though!!

Offline NewStuff

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Re: Bosch Uneo External Battery Modification
« Reply #35 on: December 23, 2017, 04:37:12 pm »
An easy way of polarity protection is to alternate the Male and Female connections, so there is a male and female on each side. You'll see this in an awful lot of commercial power connections.
Alternatively, if you can stand the bulk, Molex Valuseal are excellent for underground, and are keyed.
https://www.mouser.co.uk/search/refine.aspx?Ntk=P_MarCom&Ntt=153080436
Permission? Wassat den?

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #36 on: April 16, 2019, 07:38:22 pm »
Hi. Me again. We just bought a new Bosch Uneo but without battery. It cost us 20eur. I now have a problem modifying it. On previous Uneo with integrated battery I only need to remove it and to solder wires which goes to external battery. But on this one there is some kind of electronics and when I connected wires to connections where battery goes, nothing happens. When I press the switch there is only light from that green light which is on top and another white light which lights spot where you drill. Here are the pictures of this uneo to figure it out. I don't know what to do, maybe to avoid electronics? Thanks

Offline Rob

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Re: Bosch Uneo External Battery Modification
« Reply #37 on: April 16, 2019, 11:18:29 pm »
Why modify it? Just use the replaceable batteries, like it's designed. Yes the batteries might be expensive, but China knockoffs exist and it keeps it light and versatile.  :thumbsup:
The end is where we start....

Offline ali_mac

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Re: Bosch Uneo External Battery Modification
« Reply #38 on: April 17, 2019, 11:54:03 am »
I think the idea is that the weight of a battery and the drill, on the end of your arm can be quite tiring if you are outstretched.
I'm not sure the cost of the batteries is the largest consideration.

Also, modern, fancy cells require propriety chargers and a proper mains power supply, whereas by modifying to a remote battery in a tacklesack, you can use home made/off the shelf batteries which will charge from solar or similar chargers, which is essential for expeditions where you might not have a 20km long extension lead  ;)

Another point would be that all drills on an expedition, regardless of make, could use the same batteries, cutting down again on how much stuff needs carrying...

Offline Ian Ball

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Re: Bosch Uneo External Battery Modification
« Reply #39 on: April 17, 2019, 12:38:33 pm »
Are you sure it was working before you bought it?

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #40 on: April 17, 2019, 03:01:24 pm »
@Ian: Guy who sold us, told that it was working... Maybe he lied us... It was very weird not to work when I connected it to external battery.

We already have one Uneo that we use all the time which use external lead acid 12V battery. We have 3 batteries, one 3Ah, another 5Ah and third 7Ah. So that is the reason why we don't want to use original batteries. We put 1.6m cable and battery goes in bag which we carry on shoulder. I already spoke with one of my collegues, he will check to see if there is a problem with electronics.

Offline Roger W

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Re: Bosch Uneo External Battery Modification
« Reply #41 on: April 17, 2019, 04:41:44 pm »
The Bosch Shop (https://shop.bosch-do-it.com/gb/en/garden-product/uneo--100043807) quotes £94.99 for a Uneo (inc. battery?  £34 sold separately).  20 euros sounds a bit too good to be true...
"That, of course, is the dangerous part about caves:  you don't know how far they go back, sometimes... or what is waiting for you inside."   JRR Tolkein: "The Hobbit"

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #42 on: April 17, 2019, 09:56:54 pm »
It is not bought in store, ofcourse. Maybe it is not brand new, but it doesn't have any marks that it was used. I will see at friday what is going on with it. Maybe there is a problem with electronics.. Did anyone tried modification on this model?

Offline perop

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Re: Bosch Uneo External Battery Modification
« Reply #43 on: July 21, 2019, 03:18:15 pm »
Hey guys, would like to thank you for a great idea utilising such a small drill to do the work. I've been using it for couple of years now and had to change a couple of them since their motor has very limited number of working hours (at least the ones I've been buying, seccondhand with dead batteries).
To overcome that issue, I've reacently changed the motor with rc brushless one. I am still testing it, but for now it acts like a little beast.. It costed me 30-40$ to do so, Uneo not included.
I will soon be modifing another one for a friend and will make sure to document it with the photos, so I can poste it here.

Thanks again for great thread, it inspired me to experiment with it myself.

 P.S. Milan were you able to make your 10v Uneo work?

Offline nihil_enochian

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Re: Bosch Uneo External Battery Modification
« Reply #44 on: July 30, 2019, 10:40:06 pm »
Nice to hear that you can change to brushless motor.
Yes I succeed to make this Uneo to work. It is 12V model. I don't know why but one guy told me to try to connect 1.5V battery to those secondary connections on uneo and it worked. Below are pictures how I did it. It is not pretty solution but it works. I didn't want to try to connect 12V to those contacts, maybe I would destroy electronics. Does anybody knows why this solution works and for what are that contacts.

Offline perop

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Re: Bosch Uneo External Battery Modification
« Reply #45 on: July 31, 2019, 10:18:36 pm »
Don't know.why it need 1.5v. You can measure a current uneo draws from that 1.5v source and if it is in miliamps range you could produce 1.5v with 2 diodes (4007 should work) and 1k resistor.
Connect ccatode of one diode to -12, catode of another diode to anode of the first diode and resistor between anode of the seccond diode and +12
It should give you 1.4v at the point where you connected the secvond diode with the resistor.