18650 Li-ion battery holder for flashlights

This is a 18650 Li-ion holder for flashlights - designed specifically for mountain biking.
I used RTV silicone between the parts to make the case waterproof.

Each case contains 2x16850 cells(Panasonic NCR 3200mAh),1 PCB for 1p2s(8.4V), Waterproof DC connector and Velcro strip.

PCB 8.4V
http://www.ebay.com/itm/2-cell-2S-5A-7-4-8-4V-Li-ion-18650-Lithium-Lipo-Battery-BMS-Protection-Board-PCB-/222346888497?hash=item33c4e84531:g:cvQAAOSw4GVYUXHj

Panasonic NCR
http://www.gearbest.com/batteries/pp_189830.html?wid=21

DC connector
http://www.ebay.com/itm/1Pairs-Waterproof-Black-DC-Power-Female-And-Male-2Pin-22AWG-Cable-Connector-/301883049845?hash=item4649a1c775:g:oxoAAOSwG-1W0Ws-