I suggest you look in the Information section or search for the threads about care and feeding of batteries.
The basics; get a voltmeter, or get a really good charger. There are many brands but the better ones are computerized and do everything for you. Even recondition batteries and discharge them properly.
As you just noticed, nothing sucks more than a not-working gun because all you have is a crappy charger. So read up on the subject or go see what local players use.
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