Bit of a strange one this.
I have a ‘Tracer’ brand 8ah battery which was last charged up after an activation about 5-6 weeks back.
Went to check it last night, and although all the LEDS lit when pressing the button, it decided that it would charge up again.
Out on G/WB-004 this morning, all was fine until I was extolling the virues of said item (local QSO, 2M FM @ 10W or so…) the rig powered off half way through the QSO. Pressing the ‘fuel meter’ button, no LEDS lit. Unplugged the rig, plugged it back in again, and the 2 red LEDS lit.repeated the procedure again, everything worked fine again (and for the next hour or so.
Only thing I could think of would be short-circuit or over discharge protection, but using only 10W? I did briefly have the power up to 80W SSB earlier to complete a QSO with VK8GM, but the rest of the time it was around 20-30W, never had a problem with the battery with this usage before.
Anyway, apologies to the other party when I was talking to myself for a couple of minutes (no different to most of the time 
) and thanks to everyone who did manage to get through, especially the aforementioned VK8GM, and VK5PAS for hanging in there 
Don,
Using 80W might be taking the battery towards its max continuous discharge rate (8A), but 10W (even on FM) I would have thought should be fine.
Having said that I found (with my 10AH) after around 5 hours use with my FT-817 on 2.5W setting for the 1st Backpackers a few weeks ago the radio did not like the drop in volts when I tried to change to 5W after the contest even for SSB use.
Stewart G0LGS
In reply to M0HCU:
RF in the control circuitry?
I agree about the 80W bit, as I said, used for only about 2 minutes, and then dropped back down again to around 20-30W SSB. It was about 30 minutes after this that the issue occurred.
RF in the control circuitry is a possibility, although it’s the one and only time that it’s happened.
Only other thing was, it was sunny, and warm, for a change, and the case of the battery was quite warm, since I just had it lying on the grass. I wasn’t ‘hot’ though, although inside the case it may well have ben.
Guess I’ll have to keep an eye on it.
Don
M0HCU
Edit: Actually, thinking about it, being close to the radar on Titterstone Clee, I did have more noise than I’d experienced before (but bizarrely, only in my earpice when transmitting… sounded like a fly buzzing past every 10-15 seconds or so…) So maybe it was RF from the radar station, rather than the rig?