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What to do with usable surplus batteries?


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I've recently replaced my 12v 200AH gel batteries with pylontechs

One was bad but the other 3 are still serviceable. I gave one to a family member to run a TV in loadshedding but still have 2 good ones that I'm loathe to just hand in for their scrap value.

I don't have any use for them that I can think of.

Any suggestions?

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Get a small panel and pwm charge controller and use it to power a pump for a fountain/water feature or some kind of automatic drip system or a bunch of twinkle lights in the garden?

Replace the battery in your PC's UPS?

Use as a second battery in your car boot and install a killer subwoofer or a mini fridge?

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