Best backup battery brand in China

Compatible Sony model, NP-BX1

Battery @ $23

Charger @ $14

Battery + Charger @ $33

Spec.
input AC100-240V
3.6V， 1130mAh (New version, Sony original is 1240mAh)

compatible with original Sony charger/battery
please choose normal post if buy both battery and charger. I will post it in registered pack.