http://www.dchome.net/viewthread.php?tid=883911
(in Traditional Chinese, Google translated English page here)
So, his comparisons and results are tabulated:-
| Battery Type: | NiMH (Sanyo 2500 mAh) | AA Lithium (Energizer) | NiZn (PowerGenix) |
| Total Weight (4 x AAs): | 115g | 98g (85%) | 58g (50%) |
| AF Motor Speed (from 00 to nearest w/ DA 16-45) | 0.316s | 0.254 (80%) | 0.211s (67%) |
| Voltage (Per Cell): | 1.38V (-8% Lower than the Designed 1.50V Nominal Voltage) | 1.72V (+15% Higher) | 1.78V (+19% Higher) |
So, it is clear that the NiZn wins all, it is lighter and yet more powerful. But this may also be too powerful for the Pentax AA DSLRs to tolerate, as the voltage might be too high and more importantly, the internal resistance of the NiZn is just too low, this may put some electronics and components inside our cameras at risk, in particular the built-in flash, I bet - Read my this previous article for more details:-
Better K-x Rechargable Solution? Is the NiZn Safe?
Anyway, if you hate much the NiMH battery performance and reliability in your Pentax AA battery DSLR(s) (I DO), and if you might want to overclock your DSLR(s) for better performance, you may give the NiZn a trial. But remember, do this at your own risk and you might get your camera burnt and damaged in the end!
P.S. Recently when I did some prolonged movie recording (which was just for a few minutes continuously for each clip and then clip after clip, air-conditioned indoor) with my K-x with fully-charged NiMHs in it, it quitted and left the "LiveView" mode a few times prematurely without any warning. The battery indicator changed from green to yellow (half-depleted) and then to red (fully depleted) and back to green after enough rest! This is really annoying as I found that when I did the same with the Canon 550D, even under a hot sun and high temperature outdoor, and for even longer recording time, no problem ever happened! That AA battery rechargeable "solution" used by Pentax in any Pentax AA DSLR does really SUCK, I have to say! >:-( It's just now an unique Pentax problem anyway, for the current lines and models of DSLRs that are in the market.
Read Also:-
AA Battery Chargers Fully Compared (4 Models)
Logging you in...
frankd · 767 weeks ago
Its not just pentax either, many PS shooters have battery issues with NiMH batteries becaue of their charger suck. Zinc batteries are good but for right now i'm happy with the Eneloop and a Lacross Charger.
Michael A. · 767 weeks ago
RokVox 40p · 685 weeks ago
I went to use it last week, got the flashing battery icon. Replaced with AA alkalines (didn't have lithiums on hand). Still got the flashing icon. Sorted through my battery stash. Tried all kinds of AAs. No good.
Called Pentax. Was told "newer" batteries are "too powerful" for my "old" camera (since when is a 2006 product that cost a LOT of money "old" within six years?). Was told that 1.5 volts nowadays actually output 1.8, which is too much for this model. Was told the rechargeable solution, was told to go to the dollar store and buy the cheapest off-brand I could find (which I did—no change). Was told AC adaptors for my model were no longer produced, but there are a few left (for $50) on Amazon. Was basically told I was SOL and should probably just buy a new one.
Well, I would, if funding was available but it's not right now. So, what batteries WILL work? What brand, what model number, where can I get them? Any advice, please, thank you...
Gaetan · 571 weeks ago
I have 4 lenses with that , cannot use it. WHAt bateries should make my pentax work ????????????? Tell me !!!! p l e a s eeeeeeeeeeeeee
Palio · 571 weeks ago