EXIF datas / Battery

Hi

Does anyone know how to calculate battery voltage from EXIF battery datas (PhotoMe EXIF datas), eg.:

Battery A/D Body No Load 2
Battery A/D Body Load 124
Battery A/D Grip No Load 2
Battery A/D Grip Load 75

Or can it be calculated from the datas?

In PhotoMe my images show up as (typically):

Battery A/D Body No Load 180 (7.9V, 71%)
Battery A/D Body Load 173 (7.6V, 62%)

Since I have no grip, these levels just show a 1.

It seems that PhotoMe has done the calculation for you, or what more do you want to know?

Sorry that I didn't mention that my camera is K-x, which has not grip at all. My latest picture had next information:

Battery A/D Body No Load 2
Battery A/D Body Load 93
Battery A/D Grip No Load 2
Battery A/D Grip Load 46

It seems that PhotoMe gives little bit confusing information and might it be so that value 93 is no load value and 46 is with load. Value 2 can mean NiMH. PhotoMe version 0.79R17 (Build 856).

Well, my PhotoMe is version 0.8B2 build 891, maybe the developer has made some improvements to this section.

Whatever version you have you need to use "Online Update" in the menus to update the database etc.

I updated PhotoMe 0.79R17 to Beta version 0.8B2, but Beta version show battery datas only as binary datas (hexadesimal):
00000000 22 30 02 5D 02 2E 00 00 00 00 02 70 02 2B "0.].......p.+

If you convert hexadesimals to desimal, then
5D (Hexadesimal) = 93 (desimal)
2E = 46

So I have to go back to PhotoMe version 0.79R17.

Additional informations

I found one EXIF online tool on the net, http://regex.info/exif.cgi

It gives quite good informations, but there seems to be one bug. Battery voltage is not calculated correctly, because tool gives too high value with NiMH-batteries, voltage scaling is wrong.

New Lithium batteries:
Body Battery State Close to Full
Body Battery Voltage 1 7,17 V
Body Battery Voltage 2 6,35 V

Full NiMH batteries: Battery is green:
Body Battery State Close to Full
Body Battery Voltage 1 6,32 V
Body Battery Voltage 2 5,81 V

NiMH batteries: Battery indicator is green, but sometimes goes to orange
Body Battery State Running low
Body Battery Voltage 1 6,05 V
Body Battery Voltage 2 5,58 V

A/D-converters maximum value is FF-Hex (desimal 255) and if we don't know how the scaling is made, we can't convert hexadesimal values to voltage.

With Lithium battries voltages are 4 x 1,5V = 6,0 V (nominal) and
with NiMH-batteries 4 x 1,4V = 4,8 V (nominal).

Typically fully loaded NiMH batteris (Sanyo Eneloops) gives about 1,3V..1,4V / cell => 5,2V ...5,6V.

These values have more an academic interest anyway, I have never thougth of studying the data before you brought up the question, Jukka.

The on-camera battery indicator serves me well enough, but it is interesting to find out how much information is hidden in the exif data.

Have you ever looked what kind of information other files, like word files for example have in them?

You might be thinking, that why on earth I ask these information. I have had some problems with K-x and NiMH batteries https://www.pentaxuser.com/forum/topic/k-x-nimh-battery-problem-24466

and I'd like to know is the problem K-x itself or the set of batteries and charger what I use (Sanyo Eneloops + GP charcer).

The problem could well be your charger. If your not using one that charges each battery independently you'll never get a properly charged set. I've just bought one of these link absolutely brilliant can even be left running in refresh mode to try to increase capacity. Also shows how much capacity each battery is capable of when used in test mode which is CHARGE-DISCHARGE-CHARGE so it measures the capacity on the discharge cycle.

It's actually 4 separate chargers you can put say 1 or 2 batteries in to charge up when the others are discharging etc.

Edit: Sorry just noticed that you already have a La Crosse RS-900 intelligent Charger which is pretty similar to the one I mentioned.

I borrowed that La Crosse charger from my colleque. My own is GP's quick charger which charges also each battery independently. I got GP carher when I bought GP ReCyko NiMH cells, but K-x dosen't work with ReCyko at all.

I know that La Crosse/Technoline or Maha Powerex are the best in its class. La Crosse suits better for Eneloops than Hama
http://www.fatwallet.com/forums/deal-discussion/881250/

Yes, I have. Far too much in my opinion. The file size has no relevance to the length of the document. And it increases for each new version of Word.

I got the smaller version because I didn't really want to burn down my house with the bigger one

http://www.fatwallet.com/forums/deal-discussion/979211/

At first they said they had fixed it with a firmware upgrade,
then they started exchanging the transformer part, but still
people reported meltdowns