Understanding battery group sizing can seem confusing, but it really comes down to regional nomenclature.
Like metric and imperial there are DIN sizes (Deutsche Internationale Norm) and BCI (Battery Council International) group sizes.
What’s convenient is that most BCI sizes have DIN equivalents and vice versa.
Some makers will even place both designations.
40R = T6
48 = H6
Use this cross-reference as needed:
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