Coen said:
What battery system of the C12? There is the C12... what else uses that battery? Almost nothing. Sure, plenty of things are compatible, but they run with very poor performance on the 12V (10.8V) battery.
The C12 (Li version) uses the "big" style 12V batteries.
Fun fact:
Those 12V 3-cell packs are 100 g lighter than the standard 3.1 18V packs AND work with both the DRC 18/4 *and* the PSC/PSBC 420. Especially with the PSC these are a boon - that tool screams for light batteries ... With the DRC they lower the top speed, so not too practical.
I hope the new 2.5 packs - while shorter per videos - will be compatible with the "old" 1.5Ah packs from my C12 Li per above.