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03-26-2013, 03:49 PM   #1
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K-7 Battery

I bought an extra battery for my K7 off ebay. It says 7.4v on it, and the original says 7.2v. Is it ok to use this battery, or will it cause problems?

03-26-2013, 04:17 PM   #2
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It will be fine. Out of my three K-7 batteries, the original Pentax one is still going strong after some 2.5 years. The second one, off eBay, lasted about a year and a half, now not holding charge too well. The third one, again off eBay, is also beginning to show signs of old age after a year or so. In use I usually alternate between two batteries, running them well down and recharging as soon as possible. In practice, there seems to be little discernable difference between the 1860 mAh and the 2500 mAh ones.
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03-27-2013, 07:36 PM   #3
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I have a battery with the "7.4" crossed out in blue pen and "7.2" written in by hand. It has worked fine for 3 years in rotation with the original Pentax and another sketchy brand.
03-28-2013, 01:49 AM   #4
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Lithium Ion batteries are all the same voltage, the chemistry and state of charge determines the voltage. They only vary in capacity, life and internal resistance which can affect voltage readings when loaded, but the stated voltage is always when off load. The variation in manufacturers' quoted voltages must be down to when they measure it in the discharge cycle as freshly charged Li-Ions are more like 8v anyway.

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