Capacity: 3700mAh/Ni-MH/7.2V/26.64Wh Dimension: 100.80 x 68.00 x 17.20mm Replaces the original P/N 300-03864-1/LYNXRCHKIT-SC rechargeable battery with this higher capacity P/N 300-03866/LYNXRCHKIT-SHA This battery has 2 wires connected to a 3-pin connector. Your old/current battery may have 2 wires connected to a 2-pin connector. The circuit board has both connectors on it. Refer to attached photos describing this. Compatible Models: HONEYWELL Lynx 5100, Lynx 5200, Lynx 5210, Lynx Touch 7000, LYNXRCHKIT-SHA, LYNX Touch L5100, JJJ WALYNX-RCHB-SHA ADT Ademco Lynx system Capacity: 3700mAh/Ni-MH/7.2V/26.64Wh. Dimension: 100.80 x 68.00 x 17.20mm. Compatible Models: Compatible Models: HONEYWELL Lynx 5100, Lynx 5200, Lynx 5210, Lynx Touch 7000, LYNXRCHKIT-SHA, LYNX Touch L5100, JJJ WALYNX-RCHB-SHA ADT Ademco Lynx system. Compatible Part nos.: Replaces the original P/N 300-03864-1/LYNXRCHKIT-SC rechargeable battery with this higher capacity P/N 300-03866/LYNXRCHKIT-SHA. This battery has 2 wires connected to a 3-pin connector. Your old/current battery may have 2 wires connected to a 2-pin connector. The circuit board has both connectors on it. Refer to attached photos describing this