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Fast chargers like these are never a good idea. Charging a battery rapidly only creates a surface charge which means any volt meter will show full voltage, but you'll see that the battery's runtime is substantially lessened. The longer time you spend charging a battery (at a slower rate of course) the more run time you'll get out of it, to a point.
Not to mention that anyone who's looking for a 15 minute charge will likely be putting the batteries in immediately after thrashing on their car. The batts will already be warm before you set them to charge. This is a bad idea and it's the usual cause of batt fires and explosions. All batt manufacturers state that the batts should cool down to room temp before recharging as well as before reusing which means Use-->>cool-->>Charge-->>cool-->>Use-->>cool..etc. Disregarding this warning could easily result in anything from damaged batts to a house fire.
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