Quote:
Originally Posted by johnrobholmes
Another point to consider, what is a true 20C pack? I see many graphs of a 2200mah 20C pack that doesn't hold 2200mah at the said discharge rate. The mah of the pack is usually derived from a 1C discharge. What is the cutoff voltage of the test too? There are no clearly defined rules for the variables tested, and average voltage isn't given for the discharge rate either.
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Well discharge capacity does depend on the discharge rate, that's no secret. Ie higher discharge = lower capacity. In all fairness, there are not any std rules in rating batt packs. Its kinda like cars and HP, up to a certain point you can prolly get away w/ saying anything, b/c test condits are so variable, & if you lowball it people w/ just buy the other guy's car.
Generally tho I've seen 3.5V/cell as the limit to discharge rate. IOW, a 2S1P 2.1AH 20C batt should hold 7V @ 42A continuously. If its doing 6.5V, its not 20C
The nice thing about MA is they do have std size lipos (44mm wide) and in a large range of caps. TRC's tend to be 50mm and don't fit in NIMH batt trays. They are much more affordable than FPs tho too.