I’ve had the AB 3D implant and Q90 processor for about two years now. So far I’m happy with it. Support has been good. I did have a processor fail and they shipped me a new one the next day. Other than that one failure I haven’t had any problems.
Regarding AB’s 16 electrodes: their implant has current steering between the electrodes. A pair of electrodes can be fired at different levels to stimulate 8 locations in between the pair. So those 16 electrodes can supposedly behave like 120 electrodes (15 pairs, each with 8 phantom contacts so 15x8=120). You can search AB’s website for articles about spectral resolution and current steering. Although what all that means in real life is hard to judge. I feel like the sound quality is pretty good and it’s enough for me to enjoy most music with my CI.
I get about 15 hours on a size 170 battery, which includes quite a bit of time streaming from a ComPilot. So just about enough for a full day for me. I usually change the battery an hour or two before I go to bed.
The new Marvel CI just came out and you’re probably better off going with that if you can since it’ll have better features (direct Bluetooth streaming to any device, integrated Roger, improved autosense, etc) and will be supported for longer. Although AB is smaller than Cochlear, it is owned by Sonova. So AB can borrow tech from its sister company Phonak, which is a pretty big player.
As far as surgery outcomes and trauma, that’s probably a question for your doctor. Although I don’t think battery usage has anything to do with causing additional nerve damage. I believe all of the CI brands are supposed to be safe to use over the long term. If you look at AB’s 2020 reliability report on their website, it shows there are people still using its first implant system 25 years later. They did just have an implant recall last year. They have supposedly resolved the issue and now offer a revised implant (V2). You can read about it in their 2020 reliability report.