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Old Nov 30, 2009, 9:53 AM   #11
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Use the Canon batteries.

Having proper power delivery makes a surprising difference to the camera's electronics and can affect your pictures.

How many shots will you get off a set of 6AA NiMh batteries? Maybe 200? With the Canon batteries in the grip it will be over 1000.
A set of six 2500 Mah NiMh AA batts easily out lasts a single Canon Li-ion LP-E6. My last recharge / shot count with NiMh AA's in my 7D was 1121.

The power output of the BG-E7, and all Canon grips that allow AA's, is regulated to a constant flow. Therefore it will in no way affect the image or operation of the camera.
Do not use standard alkaline AA batts. They will crap out in a hurry and will be a waste of money.

Don't be afraid to use Re-chargable NiMh AA's in your 7D / BG-E7, or any Canon DSLR, I have been using them for years with no problems. If you use high quality 2500 or higher NiMh batts, you won't have a problem and it will not affect your images or camera.
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Old Nov 30, 2009, 3:16 PM   #12
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A set of six 2500 Mah NiMh AA batts easily out lasts a single Canon Li-ion LP-E6. My last recharge / shot count with NiMh AA's in my 7D was 1121.
Well that's much better than I thought it was, but still somewhat short of 2xLP-E6. Also - are you using the long-life rechargeables? I've not been able to find 2500 Mah AA that don't lose their charge very quickly.

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The power output of the BG-E7, and all Canon grips that allow AA's, is regulated to a constant flow. Therefore it will in no way affect the image or operation of the camera.
Do you have any references to support that? I do not have any hard evidence to the contrary, simply that I remember when Pentax were taken to task for using proprietary batteries instead of AA for their K20D they claimed that they could not get satisfactorily regulated power delivery from AA's, even NiMh.
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Old Dec 1, 2009, 12:37 PM   #13
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Well that's much better than I thought it was, but still somewhat short of 2xLP-E6. Also - are you using the long-life rechargeables? I've not been able to find 2500 Mah AA that don't lose their charge very quickly.

Yes, I use 2500 Mah batts sold in the US as Nuon. Don't bother with Energizer NiMh, they suck.


Do you have any references to support that? I do not have any hard evidence to the contrary, simply that I remember when Pentax were taken to task for using proprietary batteries instead of AA for their K20D they claimed that they could not get satisfactorily regulated power delivery from AA's, even NiMh.
My only reference is my own experience and that of one of my broadcast engineering technicians where I work. We bench tested the power output of the grip with both AA and the LP-E6 Li-Ion. The power was consistent across the power curve of the batteries.
Sorry, I didn't document the data, I did this because I was curious if the power output would be consistent, as well as greater or less than the LP-E6.
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Old Dec 2, 2009, 1:39 AM   #14
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Even though hearsay, it's far better evidence than I have to the contrary.

Thanks for the info, very interesting, and makes a battery grip far more attractive.
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Old Dec 2, 2009, 11:01 PM   #15
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Even though hearsay, it's far better evidence than I have to the contrary.
Out of curiosity I just did a quick check on standard slow-discharge Ni-Mh Enerloop AA's (6x 1.2V x 2000mAh = 14.4Wh) and they should outlast an LP-E6 (7.2V x 1800mAh = 12.96Wh)

If one did leave the Enerloop AA unused over 6 months then it would drop to the same level as the LP-E6 (i.e. @ 90% capacity): http://us.sanyo.com/eneloop/About-Eneloop-Batteries
-> 14.4Wh x .9 = 12.96Wh
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Old Dec 3, 2009, 2:03 AM   #16
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Is Enerloop a trade name?

Certainly nothing is available in the UK with that brand name that I have seen.

I do have a large pile of slow-discharge NiMh batteries though that I find essential when I use my flashgun, because I often leave it unused for 4-6 weeks at a time, but then I need to grab it and go without having to worry that the batteries might have run down while I wasn't using them.
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Old Dec 3, 2009, 10:32 AM   #17
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Is Enerloop a trade name?
Yes - This is a Sanyo brand
The reason I picked them as an example is their datasheets are quite conservative; However, they may OEM to other vendors with higher ratings:
http://www.thomasdistributing.com/sh...2_141_142.html
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Old Dec 10, 2009, 12:53 AM   #18
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B&H sales the originals for $63.00.
http://www.bhphotovideo.com/c/produc...n_Battery.html
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Old Dec 10, 2009, 6:16 AM   #19
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Is Enerloop a trade name?
It's actually 'Eneloop'. (No "r".)
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Old Dec 10, 2009, 6:28 AM   #20
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LOL. As they are not for sale in the UK it doesn't matter.
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