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I have some 18V alkaline battery packs that read 16V on a multimeter. First question - are these still worth keeping? If so, I was wondering if there was a useful/fun use for them. LED light strip maybe? Anything that would make an interesting home/shed project for a novice, don't mind spending a little money to buy tools and bits. Each pack has 2 x 2-pin connectors to connect in parallel. Battery pack details (as read from the label) 18V / 30Ah / 540Wh. Also have smaller packs 18V / 10Ah / 180Wh. The packs were originally used for running an environmental recording device in the field.

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  • \$\begingroup\$ As long you don't eat them or dispose them in the environment, you can do whatever you want. \$\endgroup\$ Sep 8 at 11:49
  • \$\begingroup\$ Excellent advice! But I'll probably need more instruction than that. Any websites I should go to? don't really know what I'm doing but keen to use them for something. \$\endgroup\$ Sep 8 at 12:07
  • \$\begingroup\$ Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. \$\endgroup\$
    – Community Bot
    Sep 8 at 14:06
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At an average of 1.33V /cell they still have about <20% SoC or juice left.

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You could disassemble one, and use the cells individually to power some "joule thief" kind of contraption.

Novice friendly video by Big Clive

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