Another good bit of info to know is the max. average discharge rate for that pack. If you try to pull more amps out of the pack than it is rated for, you can destroy the pack with disastrous results. There are many 2100mah cells on the market right now with many different discharge rates.

The discharge rate is measured in "C" (as in 8C, 15C, etc.). In the simplest terms, multiply the number discharge rate by the amp capacity of your pack (2100mah = 2.1A). If you had 8C cells, than your maximum average discharge rate would be 16.8 amps (8x2.1). Exceeding that amp draw for long periods of time can cause the cells to swell, burst or just burn out.

Most packs have a maximum discharge rate that can be maintained for 60 seconds but it's always safer to gauge your battery needs by the average max. discharge not the maximum amp discharge.

If it is not marked on your pack, thenm contact the person you bought it from and ask them what the average maximum discharge rate and the maximum discharge rate.

Don't confuse this with charging the battery. That's always 1C (in your case 2.1 amps or 2100mah) or less.

BB

Hey Matt,
Feel free to elaborate or correct me. I've seen a few packs get fried this way by new flyers and I want to save him some trouble.