A bat­tery’s “C-rat­ing” is a ref­er­ence to the max­i­mum amount of con­tin­u­ous cur­rent it can de­liver. The rat­ing is ex­pressed as the bat­tery’s ca­pac­ity (that’s what the “C” stands for) mul­ti­plied by the rat­ing num­ber. For ex­am­ple, if you have a 5000mah, 25C bat­tery, the math is 5000 x 25 = 125,000 mil­liamps, which we can di­vide by 1000 to get 125A. This bat­tery can han­dle con­tin­u­ous cur­rent draw up to 125A. The larger/heav­ier/more pow­er­ful your ve­hi­cle, the more you need a bat­tery with a higher C-rat­ing. Smaller/lighter/less pow­er­ful mod­els can use packs with lower C-rat­ings. But here’s the thing: C-rat­ings are not con­sis­tent from brand to brand, so Brand A’s 25C bat­tery may ac­tu­ally be able to han­dle more cur­rent than Brand B’s 40C bat­tery. If you’re com­par­ing bat­ter­ies of the same brand, you can be sure the pack with the higher C-rat­ing can han­dle higher cur­rent draw than the pack with the lower C-rat­ing. If your ve­hi­cle’s man­ual rec­om­mends you use bat­ter­ies of a cer­tain C-rat­ing, shop ac­cord­ingly.

Larger, heav­ier mod­els like this Ar­rma Out­cast mon­ster truck are best pow­ered by packs with higher C-rat­ings.

Af­ter ca­pac­ity, C-rat­ing (here, 50C) is of­ten the most prom­i­nent num­ber on a Lipo pack.

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