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I'm not a huge fan of QI charging because on my phone (different but similar I know) it has to be put in exactly the right place otherwise no charge. For a PDC, you certainly want to confirm its charging and not wake up the next day having found yoru assumption was wrong and no charge for that dive day (hence me always charging with plenty of reserve)
5 years on, my battery has degraded, when new (with my settings) it showed 32 hour dive time when fully charged, now its reduced to 28.
I think this indirectly points out another nice thing about the rechargeable setup. You get PLENTY of warning before the battery needs to be replaced. It gradually loses capacity over years. You can decide when to take time out to send it off for a new battery, and your window of opportunity for that is probably 1 - 2 years. I.e. It used to have a 32 hour capacity. After a few years, it's down to, say, a 24 hour capacity. You could send it then, or you could decide to give it another year and maybe send it when it's down to a 20 hour capacity. Or maybe even keep diving it for another year and send it when it's down to a 16 hour capacity.
And, with Shearwater, my experience has been that I send it off and have it back in a week. And that is using normal Priority Mail. They actually get it done in 1 day (or less) from receiving it.
With turnaround like that, and such a wide window for choosing when to have it done, I really have no reservations at all about a Shearwater computer with a built-in battery.
Even a Predator/Petrel/Perdix has a 5-year recommended service interval. So, if you're going to follow the directions, it's the same either way. Just a question of whether you buy batteries in the meantime.
I don't know a single person who sends in their computer for preventative maintenance/service check. I've own 6 computers in 15 years and I certainly never have. The majority I'm sure only service their computers if there is an issue. Therefore needing to send the computer in every 5 years for a battery replacement IS a new process for most. I am glad to hear that it is quick and painless (minus the cost) with Shearwater.