I think its best to get a battery tester. I bought one from Amazon.com and it tests 9 volts, triple A and double A batteries. Sometimes you really need to know your batter levels especially when you are using important devices for practicle uses outside, like a camera for important events example.
thanks for the responses. i am surprised this hasn't come up before. maybe i will email ray about this when mine arrives. or he may read this here and respond. i know he frequents these boards.
It's at least important to note that, despite not bearing any indication when the battery is "full", the trickle charger is incapable of overcharging your batteries. Doesn't help if you're looking to charge multiple batteries quickly, but leaves no doubt that an overnight charge will suffice - and do so safely.
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