Review on Experience Ultimate Outdoor Hygiene: Electric Rechargeable Portable Camping Shower With 1 Year Warranty by Brian West

I don't understand why the battery stopped 10 minutes into my shower the first time I used it. I had charged it the night before.do they not hold their charge overnight?The 2nd time I had both batteries that they provided charged with the 2nd one waiting in the wings just in case. The one I used kept going out but came back on when I depressed the on/off switch. It did this several times during my 15 gallon shower. I hot done without having to swap out the spare battery, but I'm wondering what might cause it to need to be restarted over and over.Do they need to be in the off position when charging? (I read that about the batteries in a similar shower head pump.) Any advice would be helpful.1) Do they hold their charge overnight?2) Do they have to be in the "off"position to charge correctly?3) Do they auto stop after 10 minutes or so needing me to re-push the LED "on" button?