So I've got a pair of these Impact BPD-8000 Universal Portable Li-Ion Rechargeable Battery Packs to run my R-4:
And they serve me quite well. I've only had one major failure where the charge went from 3 bars to nothing during a show. I wrote that off to not charging it right before the show - and assumed it had just been a while since I last charged it. Last night though one of them showed a charge of 2 bars going into the opener. After the opener was done it showed 3 bars
FWIW I don't think it's the same battery I mention crapped out earlier - but I couldn't swear to it since I'm not 100% sure which one I marked to be able to tell the 2 apart after that issue.
Just to be safe, I switched to the other battery which had just come off the charger to be safe since the R-4 trashes the open file if it loses juice while recording
Anyhow, does anyone know why this might happen? TIA.