Well ... I consider it a feature of battery selling. Fast charging a lithium battery makes it fail sooner, so I wouldn't consider it a "feature", unless you're in the battery business. (4 hours of charge in 10 minutes sounds like about a 6C charge - which is enough to totally kill a lithium battery designed for "fast" charging in a few months. 1C is maximum, 0.75C is the recommended maximum to use, and some lithium batteries are designed to be charged as fast as 2C (not the cheap ones in phones, the $5,000 ones in electric cars). (1C means that if the battery were at 0% [which you should NEVER allow - it shouldn't be discharged past 40%], it would take about 90 minutes to charge - you're charging it at its capacity. IOW, a 2250mAh battery being charged at 2250mA.)