The ultimate dive computer would never need a battery. It would know which gasses you have, and would automatically adjust it's profile based on which gas you are breathing. It would incorporate all the latest research into it's algorithms and use common sense. For example, it would include back gas breaks on deco stops, but in a smart way...so on a 14 minute O2 stint it would put the break in the middle, but on a 10 mn O2 stop it wouldn't bother with a break (just an example). It would know that at a gas switch you should do 3 to 5 minutes, and it would know that you went to backgas for the two previous stops.
The ultimate computer would have a completely independent backup, that had it's own powersource and own compartment. It would account for environmental changes such as a particularly cold dive, but only if this affects you...in other words, if you are cold, it will know, but if you are wearing lots of insulation and aren't cold it wouldn't change the conservatism.
The same goes for your level of exertion.
The ultimate dive computer would know if you had to do something strenuous right after the dive, and would adjust the decompression based on this.
If you haven't guessed by now...this computer is called "your brain".
(Sorry, couldn't resist, back to your quest for the ultimate electronic crutch)
