Author Topic: Soldering  (Read 1481 times)

Offline Fjell

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Re: Soldering
« Reply #50 on: October 28, 2021, 03:32:13 pm »
You do need a BMS, but protected cells are not a good idea for a pack, you need an external one like this on the side of the pack. For three cells in parallel at 4V, I think you don’t really need them to be isolated from each other.

https://www.ebay.co.uk/itm/274816765248?_trkparms=ispr%3D1&hash=item3ffc5b0d40:g:hGgAAOSwH9tgtKJh&amdata=enc%3AAQAGAAACkPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSlHY%252FYTip4QFVjNQrCEJt6oRXPnQUqI5GRvF9cVLkiOfD3fImX87a6XHY60%252BAZEGn90BVv7cv1jg19Qw7EbBhgFbOe3pxoeCB9%252BGYZ%252BUqbKgpTdelpP8gVJhUoJF%252BQ1BPdo3fGYnoPQB5BYgnpEomPPOMOOE2CQEfg66lF0kDY9PxYMH6v52aNk3W7Huf82hNsRyN%252FyvCHkZOgcFURh7L4fpBwAEUjR0rqyBPBGma9Jyx1I%252FnVrixzT5wMu0nJR0rRMaMG43Uf5Sr69Yi0TVd8Gzv5VoEQa53jJ8FXNrbHTzbxStv57yhR%252BNiD8Gvl%252FBPtRwbZI3vCghzrWUFF442jM92mdY4iDuvwBd689Vo4iu4bL6sXDpshLDjdQHCfFinUfODeWv2KiWabJ5O7THVqSSgzFjYmQF1UhafXsCuG0GBzOBg%252FdK96Ob%252BRhy6psDIcyvWPD7Dgxo1kdvmbHN8kuoV3BHK7MghycKSfgZWe6TeIBVkgWSh8B30ZKNHBtx1a6oxsysBkZUOMo9iKYTb5DE9SXup2Xt9J2Awoy4DQX13%252FXo7WdG30VdwgnGH2PukK8p2CKOLp%252BnJEKmucSAdL%252FYSAeZ50hsqQxISe24x9kRneeFUC%252Fa8TtLG%252BkWTXocbRRcP7QSYh3M73Ssne%252FuEMTPzwvNqYNqpaC7M1bkBs%252BcxQJmqkLArppYpNw1aCHWDH864OXroliB2kFgOwUM6SZFtFEV6G2fUk7e88ZUGkUqJrfvS8fo9cQvDiE5xwvFGZhC%252FDV4iujxA15USH74IjpXo5dURHKctrLGX%252FAg8TyrVqun%252FMgy0%252BVyXgG7ELoDN%7Cclp%3A2334524%7Ctkp%3ABFBM0OHu9Jhf

The lamp wires connect to the solder pads. You need a slightly more sophisticated one (and its more critical) for a 8V Scurion-type pack with cells in series.

Online Cantclimbtom

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Re: Soldering
« Reply #51 on: October 28, 2021, 03:33:46 pm »
Also, you can contact Strikealite and they will make custom stuff to order and/or copy other manufacturers or discontinued packs. Conveniently, they list them on the website afterwards so you can just order them if someone else has beaten you to it!

https://www.strikalite.co.uk/prodcat_type/20/ALL/0/Specialist_Battery_Packs.html
Too late for me now, but a very useful site in future.
Thanks!
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Offline Fjell

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Re: Soldering
« Reply #52 on: October 28, 2021, 04:23:52 pm »
You really must use a BMS with the Custom Duo as I don’t think there is anything in there to prevent the battery dropping below 2.5V. It is in principle designed for batteries which can go to zero. If anyone knows different I would be glad to be updated as I have several. If you go much below 2.5V or even to zero, and then try and recharge it then you may well experience interesting times - and the pack is anyway prob ruined.

The BMS prevents over and under charge plus protects against short circuit. A very techy point is maybe to make sure you get one that unlatches after a short circuit. Otherwise you have to charge it to unlatch - ie cell is unusable even if charged - a disappointing situation far underground if you got it wet or something.

Online royfellows

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Re: Soldering
« Reply #53 on: October 28, 2021, 04:35:09 pm »
Prompted by this thread and the OPs soldering skills, no disrespect intended, I have done a bit of reading up on my material. I have a report on lab tests undertaken by Samsung on their high discharge cells which included, believe it or not, putting them in an oven at 140C.
After 20 minutes their capacity nosedived.

Well, with memories of Steven Seagal's microwave booby trap in Under Siege I am surprised that they didn't bloody explode.

I would say if anything this is a comforting thought.
 :lol:
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Online Cantclimbtom

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Re: Soldering
« Reply #54 on: October 28, 2021, 05:27:32 pm »
You do need a BMS, but protected cells are not a good idea for a pack, you need an external one like this on the side of the pack... ... ...
  Thanks. Ordered from ebay using link provided
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Online Cantclimbtom

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Re: Soldering
« Reply #55 on: October 28, 2021, 05:31:00 pm »
... with memories of Steven Seagal's microwave booby trap in Under Siege... ...
If I'm ever underground and come across Tommy Lee Jones leading a team of mercenaries, I can lend them my helmet/lamp
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Online Ian Ball

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Re: Soldering
« Reply #56 on: October 28, 2021, 05:31:16 pm »
I used that same BMS for my pack of 18650s.  I suspect it will be an easier soldering this time but I will say I am glad I ordered 3 so I had a spare ;-)

Online royfellows

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Re: Soldering
« Reply #57 on: October 28, 2021, 09:34:49 pm »
... with memories of Steven Seagal's microwave booby trap in Under Siege... ...
If I'm ever underground and come across Tommy Lee Jones leading a team of mercenaries, I can lend them my helmet/lamp

 :lol: :lol: :lol:

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Offline Stuart France

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Re: Soldering
« Reply #58 on: October 29, 2021, 02:34:55 pm »
Well folks, I'm horrified to say the least at what I've seen on this thread especially the photos.

Please take a look at the suggested method and the issues raised in the attached PDF.

If you follow this step by step then you will get a good result.

Online royfellows

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Re: Soldering
« Reply #59 on: October 29, 2021, 02:59:49 pm »
Stuart's paper looks good to me but I think its true to say that the more you do of anything, whether its soldering, caving, or karate, the better you will get at it.
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