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Even though I have to throw dead devices away, I hate to throw away their batteries, which means I have a drawer with flat little batteries from phones and cameras, cubical little batteries from video cameras, and oddly shaped batteries from tools, etc. With all these, the charging circuits were a part of the original device.

Is there any practical way for a non-electrical engineer to make use of these as general power sources? It seems a shame to waste them.

I have to say that reading other questions about batteries does not raise a lot of hope, but I thought I would ask anyhow.

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closed as too broad by Michael Karas, Chris Stratton, Elliot Alderson, Finbarr, Edgar Brown Feb 5 at 20:07

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ Your best option is probably to recycle them. If you're in the US, many stores (Target comes to mind, but I've seen them at others too) will have recycling bins specifically for electronics near the front. I'm sure there's a similar arrangement elsewhere, but I don't have personal experience with it. \$\endgroup\$ – Hearth Feb 5 at 0:24
  • \$\begingroup\$ Parallel operation can work if you sense current on each cell and switch CC to CV to cutoff on the west cell which requires some logical analog diode or‘ ing of the controller. Otherwise you have break apart cells and match the best cells together. \$\endgroup\$ – Sunnyskyguy EE75 Feb 5 at 0:33
  • \$\begingroup\$ VTC - This recycle question is not really about electronics design in the spirit of the site. \$\endgroup\$ – Michael Karas Feb 5 at 0:35
  • \$\begingroup\$ I agree about broadness and spirit but had hopes that I might be pointed to a better site. There are a lot of battery questions here. It seems a shame that there is no simple way to make use of a 3.8v 2988 mAh battery or a 7.4v 890 mAh battery that are just laying in a drawer. Waht this world needs is some (cheap) universal chargers and some (cheap) universal connectors. Anyhow, thank you for your time, you've been so much more than kind. You can keep the dime. \$\endgroup\$ – pwright2 Feb 6 at 1:48