Product Review

HEIOKEY 4pcs 3.7V 750mAh Li-po Battery with JST connector RC Quadcopter Replacement Battery, It suits for MJX X400 X300C X800,Holy Stone HS110,HS200,Sky Viper S670 RC quadcopter.
Good choice for you to enjoy more flying joys.

●Battery Specifications:
Capacity: 750mAh
Voltage: 3.7V
Watt-Hour: 2.78Wh
Connector Type:JST-SYP-2P plug
Continuous discharge rate:25C
Battery Weight:19.6g/0.69oz
Battery Charging time: around 100 minutes
Battery Working time: around 6-8 minutes
Battery Size: 42 x 24 x 9.6mm/1.65 x 0.96x 0.37inch

●Battery Compatible with these models:
MJX X200
MJX X300 X300C
MJX X400 X400W X400C X400-V2
MJX X500 X800
Sky Viper S670
Holy Stone HS110 HS110W HS120 HS130
Holy Stone HS200 HS200W

●This 4 in 1 Intelligent Charger for 3.7V Lithium RC Batteries,charging 4 batteries at one time,save your time.

●Charger Specifications:
Input: DC 5V, 0.5-2.7A
Output: DC 3.7V
Battery Type: Lithium
Size:48.6x33.9x12.9mm/1.9x1.3x0.5 inch
Weight: 12g/0.42oz

●LED Status:
Red Lights on: currently charging
Red Lights off: charging complete
So when you find the light is not bright,pls don't angry.Maybe batteries are fully.

●Package Included:
4 * 3.7V 750mAh 25c lipo battery
1 * X4 JST Battery Charger
1 * USB charging cable

●Caution:
1. Do not use the adapter of over 5V to charge the batteries
2. The battery is charged and discharged once every 3 months in the long-term storage process to keep the battery activity
3. Do not use the charger to charge the batteries of different capacity at the same time,because their voltage and current are different

●Noted:
Not fit MJX X401H 7.4V Quadcopter Drone.
It is very tight for for sky viper v2400,If you are willing to modify it ,you could buy for sky viper v2400.