Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-11-2009, 07:32 PM   #91
Veteran Member
Eruditass's Avatar

Join Date: Jul 2009
Location: Pittsburgh, PA
Photos: Gallery | Albums
Posts: 2,206
Original Poster
Just wanted to say that my K-x actually works better with many of my NiMH on Auto, versus NiMH mode.

11-11-2009, 11:09 PM   #92
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
QuoteOriginally posted by noou Quote
what's your point? also the guy that had reached 1000+ shots with eneloops must have reviewed his photos on the lcd and so on...

no design to argue further: here we are discussing a real problem, all the rest is useless
My point is that you are spreading misinformation. You state that the Pentax number of 640 exposures is a pessimistic guess, but it is the other way around. The CIPA standard is an optimistic estimate, not the normal behavior of most users.

When you get 350 exposures in normal usage with some LV, video and viewing your images than that is a match with the 640 exposure CIPA specification. You may state otherwise but that's based on nothing, so there is indeed no reason for me to discuss this with you any further.
11-12-2009, 12:23 AM   #93
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
Yellow Reduced Mode

QuoteOriginally posted by OutOfFocus Quote

I will buy a suitable resistor on my way home today and measure the discharge current and voltage under better known conditions.
That will be interesting. You'll need a 1 ohm with 2 watt thermal dissipation capacity to mimic a K-X with LV. You'll probably need a bunch of standard resistors in parallel or you'll create some smoke :-)

The whole issue with the K-X is not really a firmware flaw, but that the engineers decided that you'll only get green/orange with batteries that are capable of sustaining the load of LV and video.

An alternative would have been to introduce a yellow battery mode in which LV/video is disabled. Than you would have K-M like behavior and people could use lesser NiMHs if they don't value LV or video.

Should perhaps be added to the firmware wish list. I'll do that...
11-12-2009, 01:34 AM   #94
jup
Forum Member




Join Date: Nov 2009
Location: San Jose, CA
Posts: 98
QuoteOriginally posted by Eruditass Quote
Just wanted to say that my K-x actually works better with many of my NiMH on Auto, versus NiMH mode.
I had similar experience. Also worked with my NiMH better on alkaline setting then NiMH setting. Seems that it's actually more tolerant to alkaline then NiMH batteries, and sometimes on auto it decides that those inserted NiMHs are actually alkalines.

11-12-2009, 06:21 AM   #95
Senior Member




Join Date: Aug 2009
Location: Houston, TX
Photos: Gallery
Posts: 141
Update

Continuing the saga of my Duracell 2650's:

The discharge capacities of the cells were all approximately 2400 mAh. I recharged them at 1500 mA and put them in the camera as soon as they were charged.

The camera turned on immediately with a green battery indicator. I played for a while, took a dozen or so shots, used LV a bit. I turned the camera off and on, played some more, took a few more shots. Waited overnight, turned camera on, used LV, took a few more shots. All this time, the battery indicator remained green.

I turned the camera off, opened the battery compartment, waited a short while, closed it, waited a short while (about 10 seconds), turned power switch on. Nothing. Turned camera off and on again, and this time it turns on with a red battery indicator. Tried LV. Battery indicator still red. Turned camera off and on, tried LV again, etc. Still red. Opened battery compartment, repeat all the above. First power: nothing. Second and subsequent power ons: red indicator the entire time.

I took the batteries out and discharged them one at a time into three 10 ohm resistors connected in parallel (i.e. a 3.333 ohm resistor). Each battery read 1.28 V while discharging. I calculate the current to be about 380 mA.
11-12-2009, 06:28 AM   #96
Senior Member




Join Date: Aug 2009
Location: Houston, TX
Photos: Gallery
Posts: 141
Further update

Discharging into a single 1 ohm 10 watt resistor: voltages were 1.16, 1.18, 1.18, and 1.19 V.
11-12-2009, 06:55 AM   #97
Senior Member




Join Date: Aug 2009
Location: Houston, TX
Photos: Gallery
Posts: 141
Sounds like a good idea

QuoteOriginally posted by tomtor Quote
The whole issue with the K-X is not really a firmware flaw, but that the engineers decided that you'll only get green/orange with batteries that are capable of sustaining the load of LV and video.

An alternative would have been to introduce a yellow battery mode in which LV/video is disabled. Than you would have K-M like behavior and people could use lesser NiMHs if they don't value LV or video.

Should perhaps be added to the firmware wish list. I'll do that...
Perhaps you could split the current indicator into two halves: left side is battery capacity for photo mode, right side for LV/Video mode, with solid red for low and black for disabled. (Black/black is battery discharged and camera turns off.)
11-12-2009, 07:00 AM   #98
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
QuoteOriginally posted by OutOfFocus Quote
Discharging into a single 1 ohm 10 watt resistor: voltages were 1.16, 1.18, 1.18, and 1.19 V.
That's interesting, that means that those voltages are sufficient for getting the green status in the K-X, because you used these with success in your K-X

I wonder what the results are with batteries which never give green or yellow status after being inserted in a K-X, I assume much lower voltages.

11-12-2009, 07:01 AM   #99
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
QuoteOriginally posted by OutOfFocus Quote
Perhaps you could split the current indicator into two halves: left side is battery capacity for photo mode, right side for LV/Video mode, with solid red for low and black for disabled. (Black/black is battery discharged and camera turns off.)
Good idea, pure luxury :-)
11-12-2009, 07:06 AM   #100
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
QuoteOriginally posted by OutOfFocus Quote
Continuing the saga of my Duracell 2650's:

I turned the camera off, opened the battery compartment, waited a short while, closed it, waited a short while (about 10 seconds), turned power switch on. Nothing. Turned camera off and on again, and this time it turns on with a red battery indicator. Tried LV. Battery indicator still red. Turned camera off and on, tried LV again, etc. Still red. Opened battery compartment, repeat all the above. First power: nothing. Second and subsequent power ons: red indicator the entire time.
The behavior after opening the battery department is IMO really a firmware flaw. It should give a similar battery reading as before removing them. I cannot see any reason for that, when you specify the use of NiMH. In auto mode I can imagine it guesses wrong.

Thanks for your experiments.
11-12-2009, 10:53 AM   #101
Veteran Member
Eruditass's Avatar

Join Date: Jul 2009
Location: Pittsburgh, PA
Photos: Gallery | Albums
Posts: 2,206
Original Poster
Here is some thorough controlled testing, please verify if you get a chance!

Re: K-x Battery Experience (Part 2): Pentax SLR Talk Forum: Digital Photography Review
11-12-2009, 06:30 PM   #102
Forum Member




Join Date: Nov 2009
Location: Mankato, MN
Posts: 56
So what's the consensus, here? Which rechargeables have seemed to work the best so far? I want to make sure I get some before my k-x arrives next week...
11-12-2009, 06:34 PM   #103
Veteran Member
Eruditass's Avatar

Join Date: Jul 2009
Location: Pittsburgh, PA
Photos: Gallery | Albums
Posts: 2,206
Original Poster
I'd go with eneloop or duracell pre-charged white top (if they are still around).

Pentax in Europe has been shipping with eneloops and Ned Bunnell says he uses them, so I'd go with that
11-12-2009, 08:08 PM   #104
Site Supporter
Aristophanes's Avatar

Join Date: Jul 2008
Location: Dartmouth, Nova Scotia
Photos: Albums
Posts: 3,922
QuoteOriginally posted by lattyday Quote
So what's the consensus, here? Which rechargeables have seemed to work the best so far? I want to make sure I get some before my k-x arrives next week...
Eneloops or any recent Powerex/Maha/Imedion.

Rechargeable Batteries Battery Chargers Rechargeable Lithium Digital Camera Batteries Maha Ansmann Energizer Sanyo ZTS
11-13-2009, 12:28 AM   #105
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
Eneloops is without doubt the safest choice, but indeed the white top Duracell pre-charged work as well. I and others also had great results with Varta 2500 mAh.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
australia, batteries, battery, california, camera, canada, dslr, k-x, nimh, photography, post
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Batteries: AA NiMh tech v Block LiIon Hypocorism General Talk 15 11-06-2010 10:33 AM
For Sale - Sold: MAHA 8-Battery 1-Hour Charger + 8 Powerex NiMH batteries (MAHA MH-C801D) (Worl pbo Sold Items 1 04-04-2010 10:41 PM
TR III Battery Pack & NIMH batteries? HawaiianOnline Pentax Camera and Field Accessories 4 03-26-2010 11:21 AM
Will a Vivitar 285 work with NIMH batteries? Big Dave Pentax Camera and Field Accessories 3 04-07-2008 03:56 PM
TR Power Pack III Batteries -- NiMH ??? snostorm Pentax DSLR Discussion 4 10-21-2007 09:03 PM



All times are GMT -7. The time now is 05:44 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top