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Where can I get cheap recycled lead acid batteries? I like them more the li-ion because they’re more forgiving to temperature changes and have a much lower chance of catching on fire

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The recycling process isn’t direct battery-to-battery. The lead from old batteries is removed, purified, dried into ingots, then sold back to battery manufacturers to make new batteries. In other words, it’s likely that every lead acid battery you buy is made from recycled batteries.

Good rundown of the process here: https://batterycouncil.org/battery-facts-and-applications/ho...

The same place you buy recycled steel and aluminum: anywhere that sells NEW products.

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