Just curious if you use a fire-proof case to charge those LiPo batteries. We use them in RC airplanes and carry them in an ammo can and charge them in a fire-proof container. The have been known to catch fire during charging and have caught fire and burned up aircraft on the flight line. Never charge them unattended.
Being an RC guy too, I do have a fire bag for charging and a metal box for storage. That is why this battery setup is temporary. They make much safer batteries now.
There is a video of one company that purposely shorts their battery and a competitors battery to show the outcome.
I've been talking with the deadrailinstall people and they have recommended a li-ion battery/charger set that is safe, permanent and cost effective.