My event on Sat was similar to SWs cold water anecdote.
There was no reason to expect a battery failure pre-dive, but part way through the bottom portion the amber warning appeared, due to a range of other circumstances this was less of a focus that it should/could have been.
An unexpected insta buddy, entanglement and disentanglement of said insta buddy at the base of the shot, a higher average swim speed of insta buddy and a sea/breakfast interface due to the swell on the way out were distracting.
This also resulted in a lower than usual/planned PO2 (MCCR) resulting in around 60 mins of stops. The Predator hung on gamely til the 6m stop then finally gave up...or did it.
I had a HUD and a GF but the GF is a standalone with GF set to 90/90 for a least time ascent if needed. It had already cleared, but by the stage that the Predator died I had been watching it closely to catch the remaining time, and simply waited them out at 6m.
I was carrying tables split split between a GF of 50/75 and 100/100, but the dive depth was shallower than expected so my dil was 16/55 for a 50m dive, but tables were cut for 18/45 (my usual 50m dil). I could have obviously engineered some bastardised time from the tables had the Predator died earlier but I will now extend the range of what's in my wet notes.
Bizarrely the Predator did come back to life for some of the last stop, the dive time counter had reset, but not the decompression calculation which picked up from when it had disappeared. It then died quietly on the boat.
The log has recorded the short reincarnation dive, but there's no sign of the main segment sadly.
Will change early next time...........and avoid insta buddies.