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by Kari Post on Tue Mar 23, 2021 7:26 pm
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So I have an old Canon 1D Mark IV that I unsuccessfully tried to sell and it has sat unused for more than a year. I thought it was safer to ship uncharged batteries rather than fully charged batteries, so boxed up everything without charging the batteries fully.

I went to charge the batteries today and nothing lights up on the charger when they are plugged in. Everything worked perfectly without issue the last time I used them. I have an OEM Canon Battery Charger LC-E4 and two OEM Canon LP-E4 batteries. All have been stored at a normal ambient room temperature. I've read Li-ion chargers will not charge severely depleted batteries because of risk of overheating and fire, so I'm wondering is the case here.

Is there any way to salvage my batteries and charger? Any way to determine whether or not its the charger or batteries are the culprit? I cannot figure out how to check voltage on the batteries because of their design. Any help would be appreciated!
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by SantaFeJoe on Tue Mar 23, 2021 7:32 pm
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I haven’t researched that yet, but this is an excellent resource for all things battery related:

https://batteryuniversity.com/

Joe
Learn the rules like a pro, so you can break them like an artist.  -Pablo Picasso
 

by ChrisRoss on Fri Mar 26, 2021 6:28 pm
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This link discusses your problem: https://batteryuniversity.com/learn/art ... ge_cut_off

The method suggested can't be attempted with the Canon charger and because of the connection in your pack using a different charger will prove diffciult. I would expect that the path of least resistance would be a new pack unfortunately.
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by ChrisRoss on Sun Mar 28, 2021 9:31 pm
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I have since tried measuring the voltage of my Canon LP-E4 batteries, using a multimeter - I can't get a reading from any of the terminals and can't find a pinout online anywhere. I suspect that it may have a safety feature to only connect when plugged into a camera or charger. In any case I would guess that it's the batteries, it's a known issue with Li-ion cells to stop accepting charge below a certain cell voltage. The only way to check is to find someone with a known good 1D4 battery to let you plug into your charger.
They contain 3 x 18650 cells, there is at least one post online about someone repairing one of these - you do need to be careful and buy replacement cells with solder tags already installed to solder them in and I if you attempted I'd definitely replace all cells with identical. I would only do that if you were confident working with electronics and soldering not to mention disassembling a case not really designed to pull apart. You do not want to short one of these batteries and you want to have good joins between them all.
Chris Ross
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