Qm91 at DVinfo.net

Felix Sorger · August 9th, 2004, 02:11 AM

I just bought 3 QM91 batteries and I am a bit worried of one of them.
All came empty and got a full recharge with my mono quickcharger.

Two of them display (when plugged full to the camera with the LCD monitor open) a lifetime of around 386 minutes, whereas one starts with only 260 minutes.

I know that the "normal lifetime" with LCD open should be around 4 hours with moderate zoom and almost permanent recording.

Do I have two very good performing batteries and one is just performing normally
or
is the Info Lithium not always that precise and the batterie will last longer
or
is one batterie performing less than it should?

All the three came in an untouched original Sony package from the same supplier.

I decharged the problem battery completely and charged it full again, but it still has the same amount of minutes when plugged, the others still start higher.

Any ideas?

Boyd Ostroff · August 9th, 2004, 06:38 AM

I haven't charged mine recently, but IIRC they claim about 360 minutes initially. That time is constantly revised as used, and after a couple hours recording the estimate gets pretty accurate. When you discharged the suspect battery how long did it run the camera?

Felix Sorger · August 9th, 2004, 06:58 AM

<<<-- Originally posted by Boyd Ostroff : (...) When you discharged the suspect battery how long did it run the camera? -->>>

no, I did it during the night, so no idea. I should give it a try.
I want to discharge the two others once as well, so that they have had at least one full cycle before coming to more extreme situations (specially situations -15°C, so less performance..), but I can do this later...

Maybe a long run with a "normal charger" could be an idea as well (through the camera)...

August 9th, 2004, 02:11 AM	#1
Felix Sorger Regular Crew Join Date: Jul 2004 Location: Luxemburg Posts: 27	Difference in lifetime Qm91 ?? I just bought 3 QM91 batteries and I am a bit worried of one of them. All came empty and got a full recharge with my mono quickcharger. Two of them display (when plugged full to the camera with the LCD monitor open) a lifetime of around 386 minutes, whereas one starts with only 260 minutes. I know that the "normal lifetime" with LCD open should be around 4 hours with moderate zoom and almost permanent recording. Do I have two very good performing batteries and one is just performing normally or is the Info Lithium not always that precise and the batterie will last longer or is one batterie performing less than it should? All the three came in an untouched original Sony package from the same supplier. I decharged the problem battery completely and charged it full again, but it still has the same amount of minutes when plugged, the others still start higher. Any ideas?

August 9th, 2004, 06:38 AM	#2
Boyd Ostroff Wrangler Join Date: Dec 2002 Location: Mays Landing, NJ Posts: 11,802	I haven't charged mine recently, but IIRC they claim about 360 minutes initially. That time is constantly revised as used, and after a couple hours recording the estimate gets pretty accurate. When you discharged the suspect battery how long did it run the camera?

August 9th, 2004, 06:58 AM	#3
Felix Sorger Regular Crew Join Date: Jul 2004 Location: Luxemburg Posts: 27	<<<-- Originally posted by Boyd Ostroff : (...) When you discharged the suspect battery how long did it run the camera? -->>> no, I did it during the night, so no idea. I should give it a try. I want to discharge the two others once as well, so that they have had at least one full cycle before coming to more extreme situations (specially situations -15°C, so less performance..), but I can do this later... Maybe a long run with a "normal charger" could be an idea as well (through the camera)...