Charging with a higher voltage doesn't do anything. If you read
this post You'll see that I stated no matter how many volts the battery took while it charged, they always put out 1.38 when done. Charging at a higher voltage will make the battery charge faster, and potentially fill your battery in shorter amount of time, BUT these controllers are already pushing these batteries to their limit of how fast they can charge. I have a feeling you got a battery that couldn't handle the zap from the fresh batteries. I would replace my battery with a new one, before I started to try to charge it for longer times.
Also read
this post that TinyRC made about using a peak charger.
***just wanted to add that I read this statement on the gizmo-guru.com website:
Quote:
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It's not advisable to use AA Duracell plus or High Grade Batteries. Please use standard AA Alkaline Batteries. Use of High Grade or Duracell Plus will overcharge the built in Battery in the Bit Char-G, and may need to be replaced.
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Dave