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Old Sep 8, 2011, 3:45 PM   #1
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Default Third party battery

I ordered received a third party battery from B/H Photo today that is actually 7.4 volts instead of 7.2, and 1700 ma instead of 1860. Is it ok to use it? It says replace pentax DLi90. It's made by Pearstone.

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Old Sep 8, 2011, 4:51 PM   #2
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I've bought a couple of 3rd party batteries - I've not measured them but they work just fine.
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Old Sep 8, 2011, 5:10 PM   #3
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G'day Tony

Every battery-operated device will experience a variation in voltage as the battery cycles from 100% to "flat" ... whatever % that may be
It is quite common for a hand torch to fall from 6volts to 3,6volts before the bulb stops showing any useful amount of light ~ and your car will cycle from 12volts to 10volts before it's "flat" too

Thus - the camera maker will set the electronics to operate over a voltage range ... probably 7,5v to 4,8v before powering 'off' ... and as such I see no issues with a 0,2volt variation in a new battery

Hope this helps
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Old Sep 8, 2011, 6:28 PM   #4
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Quote:
Originally Posted by Frogfish View Post
I've bought a couple of 3rd party batteries - I've not measured them but they work just fine.
Have you tried a pearstone battery.
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Old Sep 8, 2011, 6:36 PM   #5
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I have a pearstone battery for the K20d. Have never tested the voltage, but it seems to work just as well as the pentax one...
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Old Sep 8, 2011, 6:56 PM   #6
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The milliamps means that the battery will not last as long. My original phone batter was 800 milli-amps. I bought a larger battery, same voltage, but the milliamps are 2000. My battery lasts longer. So don't sweat this element of it.

The voltage is 2.8% higher. Probably not enough to make a difference. However, pay attention to the warmth of the camera. If you feel any difference in temperature, stop using it immediately. Again, I doubt it will make a difference, but it never hurts to know what to look for, does it?
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Old Sep 8, 2011, 8:20 PM   #7
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I have not had any problems with a 3rd party LI battery on my Kr, seems to last as long as the stock battery, not as long at the AA's with the adapter.

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Old Sep 8, 2011, 9:07 PM   #8
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Thanks everyone. Soon as I get my replacement K5 I'll give it a try.
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Old Sep 8, 2011, 9:21 PM   #9
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I've had two replacement generic spares for my K20 for three years and they work just as well as the one that came with the camera. (Had two because they were a two pack.)

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Old Sep 8, 2011, 11:38 PM   #10
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When I bought my K20D body I bought a 2nd battery for it, 7.2v 1800mah, works great. With the grip I probably get over 1000 shots before I have to charge one of them.
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