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I can't confirm that the PP4 uses the same, but PP2 uses size -028. Durometer 70.
Thank you. Oceanic gives same part number for PP4 battery kit as the one used for PP2 & PP3 so I think it's safe to assume it's the same o-ring.
I feel your pain my friend. I've searched everywhere & wondered about the same issue. I looked all over the internet for a battery & o ring during the start of Covid 19, OUT of stock. I'm pretty familiar w/ the PP-4. I wanted a back-up for my save-a-dive box. My suggestion is, that if you have a atturzed dealer near you, is that you go and let them install you one. GET THE VOLTAGE checked on your old batt & save if good. Specs say its best to replace the o ring every time @ replacement. If your like me you know you can do it right, but let the PRO'S do it for you! Don't want a flooded unit. Make sure if you try this on your own, to put a light lube of silicone grease on the O ring! I recommend only genuine Oceanic parts ! Knock offs might be a hair out of spec. Your dive trip depends on your safety and money! You may can find these parts online now a days. Good luck, just my 2 cents worth.
Thanks. It's not hard to get the official battery kit now. ~$31. (Sorry you had trouble before.) Too expensive for one battery and the o-ring (and some grease I guess). 2 quality CR2 batteries are $10 on Amazon. That leaves the o-ring. The computer is out of warranty anyway so not concerned about using "genuine parts". Just want a compatible o-ring. No need to let pros change a battery, IMO. Some may say I'd be being penny wise and pound foolish, and I'd take the point in some cases, but not this one, if I can source that o-ring. It's a racket that dive equipment manufacturers don't publish the specs for their easily available replacement parts like o-rings. The reason is obvious but doesn't sit well.
It's been more than a few years since I had a Pro-Plus, so I don't remember as clear as I would have liked. I thought that there was a groove on the computer itself, but I'm not positive. There are some pictures in this thread that might help. If the case looks similar, I would expect the process to be the same.
Changing a battery in a dive computer should not be something that a dive shop needs to do. Especially today. I could somewhat understand when they were first introduced and often oil filled with soldered battery contacts. But today, there shouldn't be a need to have a technician need to change a single use battery. If you want to continue taking the computer in for a battery change, that's fine. It shouldn't, however, be necessary.
