Tenergy's Smart Universal Battery Pack Charger (T-01025) is designed for any NiMH and NiCd battery packs from 6 V - 12 V (5-10 cell pack). The current of charge can be manually selected and the unit includes a temperature sensor. The T-01025 uses Pulse and Negative Pulse technology (10% negative pulls) to avoid battery from overheating and polarized during fast charging, which significantly increasing the battery pack's cycle lifePlease do not use this charger for low capacity battery packs (<1000 mAh) or high capacity packs (>5000 mAh). Strong suggestion to use Tenergy brand high drain rate battery packs. Do not leave charger unattended during charging. *Flat Rate shipping is for the lower 48 states only.