EZCART Stitchway UltraPower 1900 mAh BLACK Backup Battery Charger for iPhone 4,4G, 3GS, 3G ,iPod, iTouch-EXTERNAL, PORTABLE, RECHARGEABLE NEW! Portable External Battery Backup Charger for iPod/NANO/Classic/Touch/iPhone 4G/3Gs/3G Light-weight, super-slim design to carry with your iPhone or iPod Conveniently High-capacity, rechargeable lithium-ion battery No memory effect, Li-ion battery built-in LED indicator for battery power level