... charge and discharge more than 800 times, professional to the mobile phone, MP3, MP4, PMP, PDA, NDS, GPSPHONE, PSP, IPOD, iPhone ... one; but also has overcharge, overdischarge protection, short circuit protection function. Long life design,after 500 cycles of charge and discharge ... the charging voltage in the range of 5.5V digital mobile equipment 2200mah battery portable power station for mobile phone