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04-24-2011, 06:41 PM   #1
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D-LI90 Not Holding Charge

Recently my D-LI90 battery for my K-7 suddenly goes dead, as in loses all its charge after only 1-2 days and I haven't used my camera that much in terms of shooting. The battery is nearing 2 years old when the K-7 came out. Anyone else have this problem with this battery before or is this a tell-tale sign to buy a replacement?

Oh and I ordered a replacement just in case. I got a couple shoots this upcoming weekend.

04-24-2011, 06:56 PM   #2
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It's probably reaching the end of it's life- the expectancy is about 500 charges total.

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04-24-2011, 06:59 PM   #3
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Whenever I've bought an appliance that uses a Li battery I've always been told not to expect more than about 18months use before it starts to die. That's certainly been my experience with laptop batteries and the like. I guess it depends how well you maintain it, how heavily you use it, whether you drain it to the dregs before recharging etc. Two years sounds about right. They're a helluva price to replace, aren't they? Frankly, I've been using a cheaper, non-Pentax one as my backup battery and haven't noticed any difference in how many shots I can get before needing to recharge.
04-24-2011, 08:13 PM   #4
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They do wear out after so many cycles. Not much can be done about it.

04-24-2011, 09:00 PM   #5
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There are two possibilities:
* the battery wears out (as decribed in earlier posts), or
* the camera circuitry has a fault.

Does the battery wear out when it is out of the camera? In the negative, the issue is the camera, not the battery. That did happen to one of my P&S, and I lost 2 batteries until I realised it.

Food for thoughts...
04-25-2011, 12:00 AM   #6
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Here is a good link regarding Li-ion battery life:
How to Prolong Lithium-based Batteries -- Battery University
The pertinent points are:
  • They will all fail eventually
  • Loss of capacity is accelerated at low charge levels
  • Full discharge for each cycle is not a good thing
  • Heat is a bad thing, particularly when combined with a high charge level
  • Maintaining the battery at a state of partial discharge is healthy
The battery in my K10D has been going strong since Spring of 2007 and has supported some 17000 exposures to date. I guess that means that I had best be buying a replacement sometime soon.


Steve
04-25-2011, 06:24 AM   #7
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Thanks for all your responses, guys. It's been helpful.

QuoteQuote:
Does the battery wear out when it is out of the camera? In the negative, the issue is the camera, not the battery. That did happen to one of my P&S, and I lost 2 batteries until I realised it.
No, I keep the battery in the camera since I always carry it with me everywhere I go. And I always take constant care of the camera when it's by my side, like no sudden jolting or dropping.

QuoteQuote:
The pertinent points are:
They will all fail eventually
Loss of capacity is accelerated at low charge levels
Full discharge for each cycle is not a good thing
Heat is a bad thing, particularly when combined with a high charge level
Maintaining the battery at a state of partial discharge is healthy
Thanks for referring that article. Heat is always an issue with me since sometimes the camera's in a hot car and my apartment can get pretty hot. I never considered state of discharge to be an issue but now I know and I thank you for that.
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