Heavy Duty Replacement/Substitution for standard 802-5281 NiMH (1800 mAh) Rechargeable Battery and/or 802-5211-1 NiCad Battery. Must be recharge only with 509-0042 or 509-0037 NiMH Charger and 802-5285 NiMH Charging Stand (V3i Standard equipment charging system). Provides 2200 mAh capacity for a 20% increase in use time prior to recharge over standard 802-5281. Can be used with M6, MXT, XLT, DFX, VX3, V3i, and Slim Line TDI (SL) models. available 9/29/11