Matrix High Performance 11.1V Airsoft LiPo Battery Starter Pack w/ BMS Smart Charger (Model: Stick Type / 1250mAh - 12C / Small Tamiya)

"The Lipoly makes my Echo1 m4 v.2 shoot at an amazing rof, but the lipoly does not fit into the foregrip and you have to tape it to the fore grip to make it work!

"So I bought this package as part of my airsoft gun. The battery seems OK but the charger that arrived is not the one pictured and not entirely sure its working properly. The green LED does not come on to say it is charging so I don't know if it's working or not. My battery finally died on the field over the weekend and I've been charging all day but I don't know if it's working.

"can i use this in a stock JG 614 or would i have to upgrade the internals?