I've checked the dimensions of the 4-cell pack (2S2P or 4S1P) and it is slightly too large on every dimension than BRCA's standard LiPo limits. Length is only a millimetre or so, width a little more, but thickness is the worst - this shouldn't be an issue in most 1/10th buggies or TCs, but I know it's an issue with some trucks with enclosed battery trays.
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