Uncategorized - 25 March 2010
Author: Doug Simmons

Doug Simmons

About Author

Biographical info.. hmm. I have a history of not being able to strike the balance between what is "safe" to put into these forms and what is, in my mind at least, funny. Can't do it.

(8) Readers Comments

  1. 3000 mah wrapper on a 1200 mah battery? you know, htc will send you a free battery if you call and ask. :P

  2. damn the battery scams

  3. 2 Batteries paralell = 2400 mAh

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  7. Just wondering why they are using unprotected cells? Was there ANY circuitry at all in the casing?

  8. Paralleling two batteries can yield more than twice the total capacity, I’m not sure a 30% uprating is or isn’t deserved in the pictured case, I tend think something closer to 10% is more likely if the 1200 mAh was for something close to the actual load the phone is for the battery. There is also a (big) problem charging paralleled stacks of cells as they age.
    The mAh rating of a battery depends on both the battery’s capacity and resistance AND the tested rate of discharge and cutoff voltage. For many battery types the tested cell capacity in total mAh at a 10 hour discharge rate is far greater than at a 1 hour discharge rate. There’s a lot of data publicly available from several manufacturers for 12v 7AH lead acid batteries for emergency lighting, UPS, etc. some have a nearly complete graph of total capacity vs rate of discharge curve. there aren’t as many chemistry variations available for other battery types, but you appreciate why 1200mAH + 1200mAH > 2400mAH