OK......I know there have been a lot of postings but....... I have 2 new Excal batteries and I wore them down to the the death squeal tonight. One was totally dead and the other just about dead....getting approx 10 hours on each one. Now.... when I put them on a battery tester (cheapie Radio Shack) it says they are good. Then I put them on a Multimeter and that said both of them were good. Why am I getting those readings?