They definitely have had an issue here that, given their reputation, must be of large concern to them.
I had one of the very first batch of Terics and had the unit serviced in Dec ‘19 for battery issues - they pretty much rebuilt the entire unit except the case.
Due to Covid, that Teric sat idle until May ‘21. During that time it held charge quite well in storage, but after dive trips in May and July, I noticed much higher battery drain in storage. It got even worse after a Nov trip and I sent it back in (though never enough drain to cause a problem on a trip - just might have to recharge every night/other night.
It’s now back and it’s been 36 days since last charged and it’s at 90%. Fingers crossed it’s fixed for good. However, it is important to note that “for good” means ~ 5 years as that is the approximate expected life of these batteries.
Also - everything was covers the first time (shipping, etc.,) but I had to pay return shipping to Dive-Tronix this last time. No big deal as shipping is cheap. As usual, Dive-Tronix had quick service with great communication. I suspect they could literally swap batteries with their eyes closed at this point