shadyincYou most likely just had a bad one because I had an E17 for like 4 years using it constantly either on the PC 8 hours a day or on the go and the battery still held a good charge when I sold it.
shadyincThe 15 hour playtime for the E17k is fairly accurate. Compare to say the "claimed 20h" playtime of the XDuoo XQ-10, which you are lucky to get 4hours from fully charged (Good luck trying to determine if its actually charged though, the RED charge led never turns off if it's plugged in) The XQ-10 weighs almost nothing, inside is mostly empty space, and for an extra buck or two they could of easily included a battery with 10 times the supposed 250mAH (a single AAA can be 1100mAH or more).