This is so frustrating. I have a small LGB engine that I am trying to battery power. I’m using a Piko 35040 RC pocket remote and receiver. I have a Airwire900 battery that is 14.8v 3.4Ah that works as it should but it is too big to fit in the cab so I bought a 4 cell battery off Ebay that will fit but it does not work. I did find out that the red wire is actually the ground and the 3 black wires are positives. The rating for this battery is 14.8v 3400mAh/50.32wh.
When attached the Airwire battery works well. When it is swapped out and the HQRP Li-ion battery is attached it will send volts through the on/off switch and into the board but nothing to the motor? The Piko board does not like this battery for some reason.
What am I missing here? Does it have something to do with the mAh ?