C size battery ER26500 Main application: Radio communication and other military applications Alarms and security systems Beacons and emergency location transmitters GPS Metering systems Sonobuoys LED lighting applications Others This C size lithium battery is compatible with LS26500, LS26500C, TL-4920, TL-5920, TL-2200, SB-C01, SB-C02, SL-770, XL-140F, XL-145F.