AA batteries no longer the trend?

Started Oct 31, 2011 | Discussions thread
David Hull
David Hull Veteran Member • Posts: 6,326
Re: some people will never get it.

The question is: What is the capacity of the battery vs. its size and weight. For a 5DII, the LP-E6 is a 7.2 V 1800 mAh battery. To get this voltage with AA cells would require 6 cells. Then again you could have 2400 mAh which would run the camera longer but the camera would have to be bigger.

They need a given capacity to produce a desired "user experience" with the product in terms of shots per charge. The trade off is shots per charge vs. overall product size etc.

Looking at the Canon LP-E6 as an example: The capacity (stored energy) of a pair of 1.2 V, 2400 mAh AA's is 2.4x2.4=5.6 Watt-Hours. For a Canon LP-E6 (about the same size as a couple of AA’s) you have 7.2 V at 1800 mAh for 7.2x1.8 = 12.96 Watt-Hours. The LP-E6 provides more than twice the capacity in a similar volume. Another way to look at it is that they are able to pack the capacity of 4 AA’s into the space of two AA’s. Four 2400 mAh AA’s gives you 4x1.2 volts for a total of 4.8x2.4=11.52 Watt-Hours of energy.

The reason for not using AA's is pretty much a no-brainer when you look at the numbers. You need to work the numbers for the 9V battery you are thinking of and see where if falls in terms of stored energy.

The on-board performance monitoring (i.e. the "chipping") is also beneficial (or at least “nice to have) in that it allows the user to monitor the performance of his energy source over time.

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