This Battery has been used for RG351V devices as well
https://www.youtube.com/watch?v=_XU-sneVy28
Li-polymer Soft Pack
– Output: 3.7V 4000mAh
– With PCM(SEIKO IC)
– With Molex 51021-0200
– Lead wires: AWG#26, L:50mm
– Size : 76.5 x 54.5 x 8.2mm approx.
– Weight : 66g approx.
14.8wh