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06/02/2006 12:42:14 AM · #1 |
| Is it good practice to full discharge NiMH batteries before recharging them again? Thanks. |
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06/02/2006 12:45:55 AM · #2 |
I think that was only necessary with NiCAD batteries. NiMH batteries don't have the infamous "memory effect" of NiCADs.
I have discovered, however, that they *do* where out over time. I had a Canon BP-511a battery that was two years old that wouldn't hardly hold a charge any more. |
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06/02/2006 01:26:41 AM · #3 |
Originally posted by dwterry:
I think that was only necessary with NiCAD batteries. NiMH batteries don't have the infamous "memory effect" of NiCADs.
I have discovered, however, that they *do* where out over time. I had a Canon BP-511a battery that was two years old that wouldn't hardly hold a charge any more. |
Thanks. I was worried because I used to discharge my NiMH (using the camera's discharge feature) and my NiMH died - they wont hold charge for more than a day! I just bought some new ones and was wondering if I had been causing the problem. So, dont discharge, eh? |
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06/02/2006 01:43:16 AM · #4 |
| No, don't ever fully discharge NiMH or Lithium batteris or they will quickly become door stops. |
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06/02/2006 01:53:39 AM · #5 |
Originally posted by Megatherian:
No, don't ever fully discharge NiMH or Lithium batteris or they will quickly become door stops. |
aargh! then why in the world did my digital camera comes with this function? I thought it's a good practise to discharge them before a full recharge (same principle as formatting memory cards). I just wasted 6pcs of 2500mAh batteries - all wont hold a charge for more than 1 day. |
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06/02/2006 02:01:02 AM · #6 |
| I thought that you should discharge them because they do have a bit of memory effect though not as bad as NiCd. You are not supposed to discharge them fully, but anything designed for discharging them should not discharge them that far. You don't need to discharge lithium as they do not have any memory effect. I always fully use my NiMH's before recharging and have a spare set fully charged. I don't think I'm wrong but I could be. |
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06/02/2006 02:32:38 AM · #7 |
Hmm, mine must be senile then. I have two bp511s, I've had them for almost 2 years now, and I have let them discharge only once or twice. I make it a point to recharge them about once a week or before going somewhere where it really matters that they do not run out.
So, if you can afford it, wait until it's naturally discharged. (afford it == won't be detrimental if you run out of juice in the middle of some important shooting session).
But, I would not be scared if I have to recharge it when it's only half-empty.
-Serge |
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08/09/2006 12:50:10 PM · #8 |
Originally posted by dwterry:
I think that was only necessary with NiCAD batteries. NiMH batteries don't have the infamous "memory effect" of NiCADs.
I have discovered, however, that they *do* where out over time. I had a Canon BP-511a battery that was two years old that wouldn't hardly hold a charge any more. |
Same problem here with not holding charge. 20D, battery grip with 2 BP511's. Also the grip has been modified as per Canon original battery indicator issues.
It's worked great up til this week, great long battery life. Now the indicator on the camera shows almost empty batteries after only about 40 shots. When I recharge them they show 3/4 charged and fully charged within a few minutes. I suspect the amps and drain is too much for the batteries being 1 1/2 years old with lots of recharges.
So, I've heard there is a great after-market battery manufacturer that some of ya'll use. Are they remanufactured or new and what kind of luck have you had with them compared to the Canon brand?
So who do ya'll use for replacement batteries? |
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08/09/2006 01:11:57 PM · #9 |
| Bump so I can get some ordered BP-511 for Canon 20D |
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