Replaces battery models such as KNB-57L KNB-55L KNB-24L KNB-56N KNB-35L. Compatible with the following radios: TK-2140 TK-2160 TK-2360 TK-3140 TK-3170 NX-220 NX-320 TK-3360 TK-3160. This is a 2000mAh Li-ion battery for the TK-2100 TK-3100 series of two way radios. Compatible with charger KSC-25SK, KSC-25LSK, KSC-256AK. The replacement TK-2100 TK-3100 series standard rechargeable lithium-ion battery has an estimated battery life of up to 12 hours with the battery save feature on and 10 hours without battery save to support long work days. Contains 1 battery. Brand New - 100% new and never been used. 12 months warranty.