The HiKOKI UC18YSL3 charger is compatible with Li-Ion batteries. It is capable of charging 14.4V, 18V and 36v slide style batteries. Its cooling feature helps to cool batteries during charging or before charging commences to prevent battery overheating ensuring extended battery life. This charger features a preventative mechanism against charging a hot battery to extend battery life and a 3 way overcharge protection system to ensure battery is not overcharged. The two colour indicator light indicates what stage of charging the battery is in. Cooling feature helps cool battery during charging or before charging commences to prevent battery overheating ensuring extended battery lifePreventative mechanism against charging a hot battery to extend battery life3 way overcharge protection system to ensure battery is not overchargedTwo colour indicator light to indicate what stage of charging the battery is iCharges 14.4V, 18V and 36v slide style batteries