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Old Jun 30, 2005, 1:18 PM   #1
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Hello,

I read a test which stated approx 3800 shots with 20% flash usage while using the oem battery which is rated at 720 mAh.

my question is if using the battery grip w/ (6) 2300 mAh AA's with total power of 13800 mAh, i could expect up to 72,000 shots????

or is it not correlated like that..?

thanks,

eric
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Old Jun 30, 2005, 1:36 PM   #2
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Hi, where did you see that battery life usage ?

The Canon specifications for the RebelXT with an NB-2LH battery are
  • At 20 °C/68 °F: No Flash/Approx. 600, 50% Flash Use/Approx. 400[/*]
  • At 0 °C/32 °F: No Flash/Approx. 450, 50% Flash Use/Approx. 350[/*]
Different camera but the 20D using the BP511A gets
  • At 20°C / 68°F: No Flash/Approx. 1000 shots, 50% Flash Use/Approx. 700 shots[/*]
  • At 0°C / 32°F: No Flash/Approx. 750 shots 50% Flash Use/Approx. 550 shots
    [/*]
When using the external battery grip on the 20D with a set of 6 AA duracells I get about 15-20 shots before they are dead. (the canon manual estimates 60-80 shots)
Real life I am getting about 1100-1200 shots using dual BP511A's and a "normal" lens, because a lot of times you focus and do not actually take an image which uses power.
Or perform Chimping(review you images and histograms) which uses power.
And I suspect a 'not normal(Abey-Normal)" lens like my 300 F2.8 Ultrasonic drive lens will use a lot more power when focusing as well.

Be carefull what kind of AA batteries you put in it too, the grip for the 20D specifies Alklines or Nickel Hydride only

Peter.
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Old Jun 30, 2005, 1:44 PM   #3
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http://www.anandtech.com/digitalcame...i=2405&p=6

my AA's aren't alkalines. they are 2300 mAh NiMhs.

thanks,

eric


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Old Jun 30, 2005, 2:20 PM   #4
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Well I'm impressed :-) :blah:

I've never gotten results anywhere near that.
A bp-511A on its own in the 20D was geting me 400-500 shots in the winter before it is out of gas. I haven't tried counting in the summer. But I suspect the Canon specifications are fairly accurate.

That test site did not say what was used for a lens either.

If you have the camera, grip and AA batteries head out and start snapping :-)
See how far you get before the tank runs out :!:

Peter.
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Old Jun 30, 2005, 4:19 PM   #5
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eshieh1 wrote:
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using the battery grip w/ (6) 2300 mAh AA's with total power of 13800 mAh, i could expect up to 72,000 shots????
Check your math - It's power -> you don't just multiply by 6 (i.e. the 720mAh is rated for a higher voltage)

... beside there's a lower voltage cut-off in which the lithium ion still excell over the Ni-Mh :idea:
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Old Jun 30, 2005, 4:29 PM   #6
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oops! i forgot about voltage difference. i was just looking at the mAh
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Old Jul 1, 2005, 12:33 AM   #7
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eshieh1 wrote:
Quote:
Hello,

I read a test which stated approx 3800 shots with 20% flash usage while using the oem battery which is rated at 720 mAh.

my question is if using the battery grip w/ (6) 2300 mAh AA's with total power of 13800 mAh, i could expect up to 72,000 shots????

or is it not correlated like that..?

thanks,

eric
On my first full charge with the 350D I got 1060 photos (without flash) with the battery still showing some left. I would expect to get maybe 12-1300 before draining it completely. That is a long way from 3800 though.
John
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Old Jul 1, 2005, 6:52 AM   #8
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As PeterP have noted, the number of shots also vary with the lens used (i.e. a macro or long tele will draw more juice for example) and don't forget IS on top of the AF - all theses features draw current away from the camera

BTW shooting in RAW vs JPEG also makes some differences... :?
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