Over-temperature protection
and it is recommended to charge it to 40% -60%
2 Volt Battery
Keep Battery Cool and Dry: Cordless tool batteries will last longer if stored in a dry
Don't store in the damp and direct-sun exposure
For Hitachi 12V Battery 4Ah Replacement | EB1212S Ni-Mh Batteries 2 Pack ryobi 18v battery Over-temperature protectionReplacement Part Numbers:(use"Ctrl+F" to find your own PN & Model) Hitachi EB 1212S, EB 1214L, EB 1214S, EB 1220BL, EB 1220HL EB 1220HS, EB 1220RS, EB 1222HL, EB 1226HL, EB 1230HL, EB 1230R EB 1230X, EB 1233X, BCC1212,320386, 320387, 320388, 320606, 320608 320686, 321652, 322629, 323226, 324279,324360, 324361, 324362? Compatible With:(use"Ctrl+F" to find your own PN & Model) Hitachi C 5D, CD 4D, CL 13D, DB 12DM2, DH 15D2, DH 15DV, DN 12DY, DN 12DYK,