Cobalt 1 help: What to do if your battery is dead

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Washington State
# of dives
I just don't log dives
Hi fellow divers, my main DC is a Shearwater Perdix AI which I really love. Recently I purchased a used Cobalt 1 as a redundancy DC because the display is also self-illuminated. The Cobalt has 350 logged dives from the previous owner and was manufactured in 2011 and probably sat on his shelf for quite some time without usage/charging. Battery charges up to 89% and then stops, telling me that charging is done. I haven't taken it out on a dive yet but a 10 year old battery worries me a bit so I ended up in this thread reading about the battery issues the other Cobalts users have. Has anyone found a replacement battery which can be used? I can solder things around if needed but some advice on which battery to buy is much appreciated. Sending the Cobalt to the US support is not an option since I live in Europe...
Posts in this thread starting about #25 talk about sourcing the battery outside the US, perhaps they will help. I believe the basic battery size is fairly common, but we added a thermistor to the battery PCB to detect any over temperature. That third wire needs to be there for the Cobalt to see that there is a battery installed. Probably the PCB could be soldered onto a new cell.
It's reasonable to be concerned with a 10 year old battery. But if this sat unused and discharged for a long while, I wouldn't be too surprised that it only shows a partial charge for a couple of cycles. Many of these batteries from that vintage are still performing well. In the Cobalt 1 you could get 50+ hours of diving (depending on screen brightness) out of a full charge, so even if it has age diminished capacity you might find you are OK.


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