I've found my alternative : 

1 - 2 x 18650 Battery Holder with DC2.1 Power Jack : https://www.dfrobot.com/product-1695.html

2 - Charger : https://www.dfrobot.com/product-1693.html

3 - 2 Turnigy 18650 2000mAh 3.7V Rechargeable Li-ion Batteries

Just need an USB sector charger.