Originally posted by maxmagnum In conclusion, I believe that most of the new users having issues with batteries, probably have similar shooting habits like myself, and have caused extra battery drain by doing so. I cannot talk about issues before and after firmware update, since I installed v1.01 the day I got the camera.
As far as battery types, I don't think that there is a significant difference btw. Imedion and Eneloop. Meanwhile, I also purchased two sets of Powerex 2700 (as recommended by Pentax cust. svc.) and will test them on my upcoming trip. With all said in mind, I will try to adjust my behavior while shooting, and hope to get no less than 400 shots from a single charge, perhaps more. I will be very happy if that turns out to be the case.
Here are my battery life as in shot count in then K-x using eneloops and/or "DuraLoops" (Duracell Pre-Charged with white top and made in Japan - these are confirmed re-badged eneloops - hence the unofficial nickname)
620 - first time usage so lots of review, playing around etc.
1,295
1,252 (after upgrade to firmware 1.01.00.05)
1,102
1,074 (after upgrade to firmware 1.01.00.07)
1,303
So on average (discounting the first usage playing around count) I get more than 1,100 shots per charge with eneloops.
A word about the Powerex 2700 - they are very high capacity - probably one of the highest capacity available. The problem with high capacity NiMH is that they have thinner materials to be able to cram all that capacity into the limited volume - so are more prone to being damaged - pretty soon they develop high self-discharge - some self-discharging even within days....
The overwhelming recommendation here from experienced users is to use what you have already eneloops, as first choice, and then any other reputable brand LSD (Low Self-Discharge) NiMH batteries - such as the Immedion which you again have already.
Just charge them properly at 0.5C - which is at the default charge current of 1000mA on the Maha C9000 - and when the charger indicates "Done" leave them in the charger for another 2 hours....
Why?
- one has to read the Maha C9000 manual carefully to understand this -
the Maha C9000 is a very "safe" charger -
as such it uses multiple detection strategies to determine when batteries are charged/done - the one that's relevant/activated mostly with NiMH in good condition is voltage peak threshold - the cutoff is at just over 1.47V - this is good and safe for eneloops and other LSDs - BUT it does not charge them completely fully - it is about 90% full -
the remaining 2 hours in the charger is a "top off" charge at 100mA - this slowly and "safely" squeezes the last 10% of charge into the batteries. After 2 hours the charge then drops into a maintenance mode of 10mA.
Mostly it's OK just to use the batteries when the charger says "Done" - since that will be at about 90% capacity - but one want to squeeze every last drop of charge into the batteries safely, then leave them in the charger for another 2 hours.......