I connected 1000mah Li-Po (4v) to one, the lowest voltage I could get was 6v but I have 4600mah Li-Po (4 V) connected, it went to 4V but doesn't go back up. They also use a huge amount of power, it dropped 1000mah 4v to 3.5v (about half the battery life) in about 2 minutes when I adjusted the voltage without powering anything at all and tried another Wind up amps with similar results. I should have just bought more DROK but no I wanted more for a lower price, you get what you pay for.
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