As per
@stuartv I have limped along several times while the battery performance was decreasing, finally sending it in. The computer simply required more frequent charging while in idle and while actively diving. I, also, never missed a dive due to the battery.
This was my 3rd battery failure. The battery started to deteriorate last July, when it was about 6 months old. I waited about 5 more months before sending it in for replacement. Before sending it in, the battery decreased to 14% after 28 days, an average of a little over 3% per day. Most recently, it decreased from full charge to 90% in 48 hours, finally falling out of specifications (
>92% at 2 days).
This pattern of normal battery behavior, followed by progressive deterioration, has been present in all 3 of my battery failures. For Teric #5, I did 18 dives in March, 20 dives in April, and 19 dives in May. The battery started to deteriorate, and I did 21 dives in July, 38 dives in August, and 12 dives in October. The battery performance continued to decrease until I recently sent it in, to start over.