Bosch Uneo External Battery Modification

[nihil_enochian]

@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.

 

[Roger W]

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...

 

[nihil_enochian]

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?

 

[perop]

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?

 

[nihil_enochian]

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.

 

[perop]

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.