When you draw current from a li-ion cell, its voltage quickly drops from 4.2 to around 3.7, and holds near there. Then it quickly drops to 3.1.
They need a cutoff circuit to keep from dropping further, so you never run a li-ion battery unprotected.
So the answer to your question is that the G1X might work at 9 volts, but sometimes it doesn't. It doesn't hurt the camera, since it has an over voltage shutoff. .
One thing I've discovered about continuous mode is that if the power is suddenly cut off, it loses all the photos in the folder it's writing, up to 2,000 pictures.
I'm not sure the big lithium battery will make it onto an airplane.
Good to know. Rawopint has a shutdown on low batterie which I set always to ‘true’.
Note the value used for this is the low voltage setting CHDK battery settings. The default for this is set in the port and may not be exactly right. If it's high, rawopint will shut down when you have battery left, and if it low, the camera could shut down before it's hit. If you want to fine tune it, you can observe the voltage the camera does it's own shut down (the "charge the battery" message), and set the CHDK value a little above that.
I set the low voltage limit at 6300 mv for the G1X and SX50.
I have a script, which I run in playback mode, which logs the voltage every 30s. The script runs until the camera shutdown. I see the "charge the battery" message before the camera shutdown. I made around 10 runs and I see values between 6412mV and 6441mV. This is how I made the plots above. Can this value be different in record mode?I found one ‘lowbat’ with G1x in my log files. The last entry was 6441mV. Locks like that is the same value as Canon shut down the camera. For a save shut down, the value in rawopint should be a little bit higher or?Can the value, where Canon shut down the camera changed by CHDK?Quote from: lapser on 28 / June / 2017, 17:04:45 I set the low voltage limit at 6300 mv for the G1X and SX50. I’m wondering why you can work until 6300 mV. Is this firmware dependent?
The low voltage limit of 6300 I use is only for external batteries
On the D20, the voltage before camera shut down was 3.328. Interestingly, the camera also reported the ISO of the last shot as 5 (instead of 800)
I write the entire log file at the end.
Quote from: lapser on 29 / June / 2017, 09:56:06The low voltage limit of 6300 I use is only for external batteriesI don’t understand this. Does the camera have different low voltage limit for internal or external batteries?Independent, if I use the internal battery or the 6 AA NiMh batteries operated in a sixfold holder, my camera always shut down at 6440mV. So I never had a chance to go to 6300mV on external batteries.
Quote from: lapser on 29 / June / 2017, 09:56:06 I write the entire log file at the end.What is the advantage of this? In a crash, all data could be lost.
It's a timing problem at short intervals. Writing a log file while the camera is saving raw files sometimes blocks the script for several seconds. That increases the minimum interval, which is important for what I want to do (i.e. get as many shots as possible in under 2 minutes during the eclipse).
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