just to save a bit time for others this is an apparently homemade battery pack.
Uses Sanyo prismatic cell pouches wrapped in black duct/cloth tape. Advert says lipo but it doesnt seem to stack up against quoted 2c discharge. So more likley some other lithium chemistry
its 10 x10 x 30 cm and weighs in at 8kg
No BMS
No charger inlcuded
Pack is split into 2 for charging purposes (and 8s and 5s to get 13s). So you need a balance charger capable of charging up to 8s
Seller has 40 ratings in total. All positive. Based in Feltham
price starts at £180 with a buy it now of £280
