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Is the DC charging design on the Wiring Diagram safe?I'm using the battery balancer.
what about 18Ohm speakers or headphones? I tested a 3.7v 500mAH battery (it wasn't charged enough) and it gave the same volume and power, but I don't know much mAH my headphones use.
DIY Tough Bluetooth Boombox (Lasts 20hrs!)