I also started having this issue yesterday. Like a couple others, I suspect this is related to a recent firmware update. My Fitbit is only a few months old and before this week, I only needed to charge it every 8-10 days (and it usually had ~25% battery life left when I started the charge). Now I've had to charge it twice since yesterday afternoon. It was completely dead yesterday and today I started charging when it got to 15%.
When I went to bed last night, it had ~98% charge. When I got up this morning it was at 57%. I monitored it for a couple hours and it only drained by a couple percent during that time. Then it was suddenly at 30% when I checked ~30 minutes later. I monitored for awhile again and it only changed by a small amount, then suddenly went down to 15%. I have no idea what triggers the big drop.
From reading the Charge 5 forums, it looks like a lot of people are having the same issue with that device and Fitbit is aware of the issue. The question is will they acknowledge that this is an issue with the Charge 4 and fix it?? I don't really want to waste my time dealing with customer support. Even if they offer to replace my device, I'm pretty sure that the new one will have the same issue, assuming it has the same firmware.
Is there a way to tell when the the device was upgraded? That would help to prove the theory that it's an update that messed things up.
