I had this happen. The stuck part. I found that using a large rubber band wrapped around the cart helped.. This increased the grip friction and by increasing the diameter, the mechanical advantage.
My buddies have learned to use it. One commented that now that he knows how to hit it, he always gets powerful hits.
You just need friends that will learn.
Before everyone goes and buys a ton of these batteries, remember lithium batteries have a operational life, even if left unused. So don't buy them with idea of just storing them for later. The shelf life of a lithium battery is about 3 years.
I had mine stick once. I caused it by spinning the base on fast. There was enough momentum to get base "all the way on" making enough friction to have it stick. I would not suggest lube at all. Just make sure the threads (one on the switch and one on the body) are clean. And be careful about...
I have to admit ignorance in the matter of ohms. I thought I understood it in terms of watts, volts and amps. But that ohms thing....
~3.7 volts then. At ~4 amps.
An interesting power supply problem...