Kann Akku am Ladegerät MH-16 verbleiben?

m-hermann

NF-F Platin Mitglied
Liebe D1*er,
zur Frage, ob ein EN-4 oder Fremdakku am Ladegerät MH-16 verbleiben kann, findet sich leider im Forum und im Web keine zielführende Aussage. Auch in den offiziellen Manuals zum MH-16 oder zur D1X steht dazu nix.
Eigentlich sollte man unterstellen, dass so ein hochwertiges Ladegerät bei volller Ladung auf Erhaltungsladung umschaltet. Vor allem bei NiMH mit der hohen Selbstentladung wäre das sehr zu wünschen. Eine Überprüfung der Erwärmung von Akku und Ladegerät hat ergeben, dass sich beide während der Ladungsphase stärker erwärmen als nachher, wenn die grüne LED den vollen Ladungszustand anzeigt. Ich hab z.Zt. einen 4Ah Akku ca. eine Woche dranhängen und es zeigt sich keine besondere Erwärmung mehr wie während der Ladungsphase - weder beim Akku noch beim Ladegerät. Daraus schließe ich, dass zumindest keine weitere Aufladung mehr stattfindet, was für den Akku schädlich wäre.

Falls jemand diesbezgl. genauere Informationen hat, würde ich mich sehr freuen.
 
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m-hermann

NF-F Platin Mitglied
gerade habe ich was auf "Vinland's Battery Page" zum MH-16 unter "Battery and Charger Information" gefunden, dort wurde analysiert:

One MH-16 Charger was tested and the following was measured:
Refresh Discharge rate= 0.31A
High Charging rate= 1.42 A
Trickle Charging rate= 60 mA
Charging voltage after 15 minutes= 8.25 V
Charging voltage while switching to trickle charge= 9.10 V


Ist "Trickle Charging" = Erhaltungsladung ???
 

m-hermann

NF-F Platin Mitglied
... und was ich noch auf der Seite gefunden habe, sind Analysen eines Ingenieurs zum Stromverbrauch der D1er, da wunderts kaum das die Akkus so schnell leer sind:


1. Camera off: The drain in off mode is extremely low, 0.17mA. By dividing the 2000mAh battery capacity with the current drain we will get approximate hours of use. 2000/0.17= 11,760 hours= 490 days! Of course, the battery will selfdischarge in the meantime but the "Off" drain is absolutely insignificant.
2. Sleeping: This was a big surprise! The current measured 0.21mA. An insignificant change from the Off mode! Doing the same calculations as above, it would last 397 days. In other words, the practical reasons to turn the camera off is to prevent accidental exposures and auto focusing.
3. Camera awake: As soon as it wakes up, it will use 590 mA (=0,59A!) continuously until it falls asleep again in six seconds if that setting is used. If continuously used, it would last 3 hours and 23 minutes. Theoretically, one would get 2000 "wake-ups" on one battery charge. This is very significant! If the camera is woken up four times for each picture taken, we are down to 500 wake-ups even before a picture power drain is included.
4. Picture taking: This was the second surprise. There is a large, very short current spike as the mirror closes but then it basically drops back to the typical 590 mA current drain. The current spike is so short that it does not use any significant power. This is independent of the resolution mode. After the picture is taken, which takes a fraction of a second, the camera processes the picture and saves it to the CF. (Actually, if long time exposures are done, the current drain while the shutter is open is 1200 mA (=1,2A!) and will affect the battery life if very long exposures are made)
It is the processing/saving time that is significant. In order of increasing resolution that time is approximately, 0.5s, 1.0s, 1.5s and 8.5s. The only reason that we are getting fewer NEFs than JPGs pictures is the actual time the camera is awake. I do not know why the NEFs take such a long time to process since no compression is done. JPGs should require a significant amount of calculations for the compression although the final size is smaller. I also do not know if the time depends on the brand of CF. Faster saving directly translates to more pictures. Since I do not have a microdrive, I could not measure one.
Also note, waking up the camera and taking a JPG almost uses as much energy as just waking up the camera, about 7 seconds vs 6 seconds.
5. LCD monitor: The current drain is 50% more while it is on; 900 mA. The problem is that it often further adds to the time that the camera is awake.
6. PC Mode: The same typical 590 mA drain here also. The problem or thing to watch out for is the long time that the camera might be on, since it does not time out in 4 or 6 seconds.

Extreme examples:
Basic JPG, 4 seconds until sleep and no extra wake-ups: Total is approximately 5s/picture which gives about 2400 pictures. No one uses the camera that way but it gives an idea about the high end limit.
NEF, 8sec timeout, 4 second LCD/picture, 4 extra wake-ups: Equivalent to 51s/picture which gives about 290 pictures.
This would be further degraded by a slower microdrive and the focusing current for the lens. Please do not pick on these numbers, they are calculated based on Nikon's claim for the battery which might not be applicable in this mode and there are many variables that I have not included in this report to try to keep it simple. It does show, how some persons can get 900 pictures and others just a few hundred.
 

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