Re: battery want stay charged The amp draw is the best to locate a drain with but all don't know how to use them. Like Rod i have located many drains with the trusted test light. Kind of get used to how bright it burns and when you are working alone the light is easier to see from afar. Yes, the meter is the best on late models. Hollis did the battery lose its charge with the cable disconnected? If so the batt is bad regardless of what the ck showed. I have seen this also.