Karl_H, apparently you haven't dealt with the Smart Series of computers. They're not like the others on the market. We sold them at our shop, and I had more than one customer who treated these like the other computers running double-A's or some other low-end battery.
First, the battery has several more YEARS of life in it at 67%. The computer is designed to get you through a long vacation even when it gets to "0%" life left.
Second, no shop can replace the battery. It must go back to the factory. This is why they have that hidden end of life in the battery display (they figure most people won't check the computer until just before the trip). But Scubapro won't even replace the battery until you're down around 25%. I know this from first hand experience. I had a customer who insisted that we have the battery changed out in a situation like this, and Scubapro refused to issue the RMA for service.
The reason they replace the battery at the factory is that some shops tried to replace it with lower quality batteries in store, resulting in more problems than they were willing to handle.
If you are the original owner with the "batteries for life" card, they not only will change out the battery when the time comes, but will do a complete diagnostic, change out several soft parts (like the screen protector), and all for free. If not, expect about $150 for a change.