This battery claims 6000 mAh and that is true, tested it with my battery meter. I can’t speak on discharge if it efficient enough I would hope so since the battery isn’t using a step up or down regulator. My main application for this battery is for headlights so it has a considerable draw in power. But if you plan to use this for your e-bike, scooter or whatever the light will last you one night ride. As little as 2 hours all the way to 6, depending on how much your lights draw. Charging the battery a bit confusing but let me clear things up. You need to turn on the battery while you charge it. If you don’t not a big deal but it won’t fully charge. It also takes longer since the power switch creates resistance, it has weird circuitry. Overall I’m satisfied with the battery but I do with the cells were larger capacity. There 6 cells inside 3 in series & 2 in parallel. But the battery 6000 mAh and there 6 cells that means each cell around 1000 mAh. If I had the tools to spot weld I would swap the cells out for 2000 mAh capacity. That would drastically increase battery life.
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