I have a stock Merida 550 LTD that I just converted to LiFePO4, thought I would share what has turned out to be a very good deal on a quality Battery Pack and BMS (BMS is mounted in aluminum so no risk of flex to the board).
The Battery Pack and BMS all fit very nicely inside the Merida Battery Box, the closed cell material that the Pack was shipped in worked very well as spacer material inside the Merida Battery Box.
Here is contact: (communication is very good ! They answered all my questions)
Company: Shenzhen Richroc Electronic Co.,Ltd
Tel: +86-755-2712 6881 / 2987 1511
Fax: +86-755-2172 6472 / 2916 8202
MSN: chinarichroc [at] msn.cn