The issue as I understand it is the amperage which the mod uses to recharge. Some electronics use 2 amp chargers (for example), and the mods will require a 1 amp charger. Using a 2 amp charger would be an unnecessary risk for failure.
The device will only pull what it needs. If your charger can supply 2 amps but your Coolfire only needs 1 amp then it will only charge at on amp. This is a feature of the USB standard and not applicable to the older 510 connection style chargers.
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