Compatible Original Battery Part nos: Replaces the original P/N 300-03864-1/LYNXRCHKIT-SC rechargeable battery with this higher capacity P/N 300-03866/LYNXRCHKIT-SHA
Don't forget to call the alarm company and have them put it in test mode before you open the unit. 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.
