With regard to the battery life of the Perdix, it depends on one's dive times, but I have my Perdix AI set in rec mode, and I got up to around 50 dives before I changed the first battery. Many of those dives were 50-60 minutes, some were 30-40 minute dives assisting classes. I'm now up to 80 dives on the Perdix and have two thirds of life left on the second battery. Most of these last 30 dives on the Perdix are classes.
So I think battery life is just fine on this computer, plus, as previously stated, battery changes are easy.
So I think battery life is just fine on this computer, plus, as previously stated, battery changes are easy.