The dimension of this battery is the same as the BPS S-2,4 Ah NiCd battery (LxBxH 120x55x52 mm).
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Only the BPS C-1,3 Ah NiCd battery is less high (42 mm) and 200 gram lighter, you can see the difference of 10 mm on the pictures.
I find the difference in battery-weight a lot compared to the total weight of the C12.
And the mobility of the C12 is much better with the smaller battery. But of course it's all very personal.