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DIY Power Bank
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Please be positive and constructive with your questions and comments.

DIY Power Bank

by JRMN on Tue Aug 13, 2019 8:07 pm

I have 15 of these OEM D-X1 1380mAh (3.7v) BlackBerry batteries. Can I used them to create my own battery pack similar to what everyone is doing with the 18650 battery packs?
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JRMN
 
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Re: DIY Power Bank

by adafruit_support_mike on Tue Aug 13, 2019 10:17 pm

It's generally a bad idea to try and combine batteries.. or any other power sources.. unless they're specifically designed to work that way.

All power supplies have low internal resistance by design. It keeps their voltage from drooping when you draw more current from them. But when you put power supplies in the same circuit, they all look like short circuits to each other.

Some kinds of batteries, like AA cells, have internal resistance that increases as they discharge. If you put a nearly-depleted cell in series with a fresh one, the one that's nearly empty will limit the current enough to keep from damaging anything.

LiPos and other rechargeable batteries continue to have low resistance as they discharge, so putting them in series or parallel can be dangerous.

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Re: DIY Power Bank

by JRMN on Sat Aug 17, 2019 5:46 pm

Thanks for the info. Mike. Much appreciated. I will hold onto the batteries as I might be use them separately for future projects.
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Re: DIY Power Bank

by kflmiami420 on Sat Aug 17, 2019 6:34 pm

Yes you can If you know how to solder just take a look at this guy and what he did with old cellphone batts https://www.youtube.com/watch?v=m04CXhoQ2jU

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Re: DIY Power Bank

by JRMN on Sat Aug 17, 2019 9:30 pm

Thanks kflmiami420. I've come across a few of his videos before. I guess I didn't look hard enough.
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Posts: 49
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Please be positive and constructive with your questions and comments.