Use the replacement battery usually in exchange or use it as a power bank for my Q10 but also for charging other devices via USB Micro. Works beautifully. Since the battery is charged and discharged regularly, I can not say anything to that described in other reviews discharge on continuing charger. In any case reached this replacement battery's full performance only after several charging cycles. When you first use the capacity appears to be very low compared to be already in use battery. After several full charge cycles full capacity, all wonderful. In summary, a good traveling companion or a security at a very intensive use of Q10 that a road not run out of power. Note: Only the capacity is, of course, since it is limited by the capacity of round about the same battery as in the device. If you need more power, the purchase of a Power Bank would certainly recommended. In which case probably the form factor and the weight will not be as handy as with this replacement battery .... Apart from battery replacement is with the use of a power pack also not possible, you can use this exclusively for charging via cable. In this respect, this replacement battery has clearly still justified ....