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External Power for ELPH 300HS

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Offline waterwingz

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Re: External Power for ELPH 300HS
« Reply #30 on: 19 / September / 2014, 20:39:07 »
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Quote from: El Pistoffo on 19 / September / 2014, 20:30:25
I'll have to look into that earlier post by ahull
He got the voltages correct.   

This might be a more complicated thing related to something like  "equivalent series resistance" of the battery pack where the current delivered causes the voltage to drop even thought the battery itself still has a lot of charge stored.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline El Pistoffo

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Re: External Power for ELPH 300HS
« Reply #31 on: 19 / September / 2014, 20:45:48 »
Quote from: waterwingz on 19 / September / 2014, 20:39:07
Quote from: El Pistoffo on 19 / September / 2014, 20:30:25
I'll have to look into that earlier post by ahull
He got the voltages correct.   

This might be a more complicated thing related to something like  "equivalent series resistance" of the battery pack where the current delivered causes the voltage to drop even thought the battery itself still has a lot of charge stored.

I wonder if it an issue with the parallel battery holder.  It is kind of cheap (Chinese) but one of the only I could find.  It also has protection circuitry, maybe coupled with the batteries protection it causes an issue.   Why can't things work as they should?  :(  When it does work, it's a great power source with loads of run time.

I might try a different battery holder manufacturer.
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Offline waterwingz

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Re: External Power for ELPH 300HS
« Reply #32 on: 19 / September / 2014, 21:29:25 »
Quote from: El Pistoffo on 19 / September / 2014, 20:45:48
I wonder if it an issue with the parallel battery holder.  It is kind of cheap (Chinese) but one of the only I could find.  It also has protection circuitry, maybe coupled with the batteries protection it causes an issue.   Why can't things work as they should?  :(  When it does work, it's a great power source with loads of run time.
Hooking Li batteries up in parrallel has risks.    Trying to use batteries with added protection circuitry for recharging seems to just increase that risk.  I don't know that it is what is causing your problems, but the fact it all works with internal batteries or a DC supply is telling us something.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline El Pistoffo

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Re: External Power for ELPH 300HS
« Reply #33 on: 19 / September / 2014, 21:37:37 »
Quote from: waterwingz on 19 / September / 2014, 21:29:25
Quote from: El Pistoffo on 19 / September / 2014, 20:45:48
I wonder if it an issue with the parallel battery holder.  It is kind of cheap (Chinese) but one of the only I could find.  It also has protection circuitry, maybe coupled with the batteries protection it causes an issue.   Why can't things work as they should?  :(  When it does work, it's a great power source with loads of run time.
Hooking Li batteries up in parrallel has risks.    Trying to use batteries with added protection circuitry for recharging seems to just increase that risk.  I don't know that it is what is causing your problems, but the fact it all works with internal batteries or a DC supply is telling us something.

I hear ya.  I have a battery charger for these 18650's.  I'm still not too confident with the quality of the battery holders.  Unfortunately almost all of them are Chinese but I did come across one that has no built in protection and looks to be of better quality.   
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Offline El Pistoffo

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Re: External Power for ELPH 300HS
« Reply #34 on: 20 / September / 2014, 14:05:14 »
After much testing this morning I think I have found the issue, CHDK dark frame mode enabled in the meteor 2.6 script.  It turns out it's the only script where the camera freezes up.  I went through disabling different features of the script and camera.  When the dark frame method is set to "CHDK", I would get sporadic stops at either 1 pic or 102 pics.  The script was set to take 150 pics (only 1 of 5 attempts made it to the 150 pic mark).

I've set Dark Frame mode to "none" and I've had 3 successful attempts in a row.  All other features including display off work fine.  I don't mind leaving the dark frame off, I haven't been doing any subtraction with the TL images anyway lately.  As long as I keep the ISO to 800 or less it's ok.  More than that and
I get too many white sensor specks.

So far this morning I've taken 1227 photos with the camera using my dual 16850 battery pack and the in-camera power level meter is still at 88%.  I know the meter reading is probably not calibrated correctly for these cells but I bet I could easily get double the shots I've gotten so far. This battery pack works awesome.

Not sure what the in camera dark frame operation is doing to lock up the operation but at least I found a workaround.
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