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When you're charging batteries, you SHOULD be sending through a voltage that is EQUAL to the pack (2.4v for dual, 3.6v for triple and so on) going higher than the rated is overkill and could be detrimental.
How much amperage you send through is really up to how confident you are that the batteries can take it. Considering the stock Bit Charger (on the remote) PUMPS out ~2.5A, that 500mA adapter isn't going to hurt anything...Then again, you're using an AC adapter and not a proper DC adapter (unless you're using something to convert) but that's a different story.
...Anyway, for some math: Divide the capacity of the battery by the charge rate of the charger, then increase the amount of time by about 20% to allow for a certain amount of inefficiency (batteries and charging them is not an exact science).
- At 500mA, it would take a little less than 6 minutes to charge the 3.6v/40mAH pack (40mAH/500mA X 20%= hours needed to full charge)
Considering these calculations we can look at how much juice a Bit battery gets from a 45second charge @2500mA (the stock charger).
2500mA = 41.66mA pr/minute = .6944mA pr/second.
.6944mA X 45 seconds = 31.25mAH - 20% inefficiency = ~25mAH (so, a single charge on a Bit Charger is really only providing 1/2 the capacity of the stock 50mAH battery)
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