I'm putting LEDs and fiber lighting into a ship model. There's not a ton of room, but I found I could fit two LiPo (3.7v, 2400mAH, DTP 605068) Batteries in series with a single two-prong connector. The connector is plugged into a "SparkFun LiPo Charger Basic-Micro-USB (PRT-10217), and the +/- terminals of the charger board run to the circuit. Now for the problem.
Everything lit up really well and stayed lit up the first time, but whenever it gets plugged in the battery stops powering the circuit. Not only that, but when plugged in to a micro usb to any power source only part of the circuit comes on at full brightness (The branch with the 2red and 1 white LEDs), the rest of the red leds glow very dimly (except one 2 red branch that doesn't light at all). I suspect most of the white LEDs are lighting dimly, but as they are lighting bundles of end-glow fiber, it wouldn't be too obvious by the outside of the ship.
However, I've found that I could "jump" it by briefly connecting another battery of the same voltage to the leads off the LiPo charging board. When I do that the installed battery runs it just fine, turns off and on and keeps powering the whole circuit, until it's plugged in again, then the problem returns. I'm really hoping it's not the charging board that is the problem as getting it back out of the model will be a pain in the butt. Thanks in advance for any help!
All LEDs are 20mA, the Red LEDs are 1.77Vf (measured) the white are 3.2Vf