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 Post subject: Battery Grips
PostPosted: Tue Mar 06, 2012 8:33 pm 
Not sure if this is the right place to post this as its regarding a 3rd party battery grip for a canon 550d, but here goes anyway.

I have had a Meike battery grip for my 550d for a while now and use 3rd party batteries in it. I have found the battery life is very good and have no complaints. One strange thing I have noticed is that when the batteries die and I recharge them one battery will only take a few minutes to recharge (5-10) and the other will take an hour or so. It seems as if they are not being drained at the same rate. Has anyone else experienced anything similar?
I am no electronics whiz, but batteries in parallel should drain at the same rate shouldn't they? They are both of the same brand and rating (not Canon I might add). I makes me think I may have a duff battery, but this said they both seem to last roughly the same when used solo in the camera body.


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PostPosted: Tue Mar 06, 2012 9:41 pm 
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Are you sure the connection is not serial rather than parallel in your grip?

Does it take any more time for the camera to die with 2 batteries rather than 1?

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 Post subject:
PostPosted: Tue Mar 06, 2012 10:18 pm 
I assumed it was parallel as it will work with one battery in either slot or two.
It lasts much longer with 2 than one battery.

I will have to experiment with the batteries in different slots and see if its a particular battery than drains faster or a particular slot.

I also find the camera's battery level monitor stays at 100% then drops to 50%-25% then dead within 10-20 shots. Which can catch you out sometimes.


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PostPosted: Wed Mar 07, 2012 3:47 pm 
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Hm, got the same sort of problem here, but then with a genuine grip and fake batteries (Lenmar). The batteries are 100% for a time, and after that (also without grip though) they're immediately ''almost empty'' (half battery icon) and quickly after that the camera stops working.
Strange, yes. Ive got the same thing with the 350D and grip though, and the 350D's got the same battery icon (full, allmost empty, empty). So I think the ''almost empty''/''half full'' is more like 15% left or something.

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 Post subject:
PostPosted: Thu Mar 08, 2012 7:30 am 
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Have you thought about the age of the batteries? Because sometimes you can get a new battery off the shelf but its already holding at half capacity because its been sitting on the shelf for about 5 years. Happened to me. Bought a new battery and checked its recharge rate and age and it was near to dead, and according to Olympus, it was a battery that was made 8 years before.

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 Post subject:
PostPosted: Thu Mar 08, 2012 1:58 pm 
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Hmm, Ive had it with new batteries, so that couldnt (or could it?) be the problem.

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Ruben

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 Post subject: Re: Battery Grips
PostPosted: Wed Apr 18, 2012 7:02 am 
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Does anyone know how the Canon grips work, especially the BGE5?

Does it use both batteries at the same time or use one up then start sucking juice from the other?

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 Post subject: Re: Battery Grips
PostPosted: Wed Apr 18, 2012 1:19 pm 
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From personal experience it discharges both at a steady rate... I have the BG-E7 and two LP-E6 genuine batteries, if that makes any difference.

EDIT - I may be imagining things, but I've also anecdotally noticed that battery charge will equalize between two differently-charged batteries over time... IE, 75% batt + 25% batt = two 50% batts... although it might be coincidence that I may have swapped out another battery for the 25% one (I have 3). Has anyone else experienced that or am I just in need of more sleep?

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 Post subject: Re: Battery Grips
PostPosted: Thu Apr 19, 2012 1:49 pm 
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If my recollection serves me correctly, I once had a battery that could not keep a charge.
No matter how long I charged it, by itself, it would not keep the camera powered up for long.
I found this out due to a set of batteries dieing on me rather quickly in my Canon BG-E3 grip.
Once I got rid of this battery and started using another, everything was fine.

So in summary, yes, one battery seems to try to charge the other one in order to provide a constant voltage.

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