The problem is the type of batteries used in the 501X, a saddle pack namely. If I stick some small spots of velcro between the cell 'holes', it is possible to use this kind of LiPo's. But I prefer the saddle config LiPo, as it looks more like the normal Ni-MH saddle packs.
In a B4, batteries like the Kokam/Orion Trakpower 4900 are just perfect.
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