Suit for 7.4v quadcopter,
such as Wltoys V666 V353 ; XK k120 ; MJX X101 X600 ; Syma X8C X8W X8G ;Yizhan Tarantula X6 rc quadcopter.
7.4v is 2s battery, has two cell inside, full charged, each cell 4.2v.
have balance charging and overcharge protection.
Can act as a spare or replacement charger for your rc quadcopter.
Can show the charging state.