I have a fr245 for 5 years and bought a 2nd hand music for my son half a year ago. Both worked without any issue until 2 weeks ago, and we charge them about every 5 days.
My son's fr245m however started to loose battery very fast in the past 2 weeks. It sometimes doesn't even hold a full day. Yesterday afternoon we left home with 97% and today at noon it already turned itself off and we didn't do any activities.
I was trying to think what could've changed in the past 2 weeks. No new all installed, no new firmware. No change in usage, except one thing: he's been to the pool for the first time since he got the (2nd hand) watch. So I am thinking, that maybe the water somehow causes this? It luckily doesn't show any fogging so I don't think that's the issue, but also can't point at anything else.
Ah, and because it looses battery so fast now it reached 0 a few times in the past 2 weeks, so it even "self" restarted.
I tried to compare the 2 watches to see if there's any sign that the 2nd hand watch maybe had it's battery replaced, but I can't be sure. There's no definite sign, but there is some more "ware" than on the watch I own for 5 years. It could be that it was opened and not sealed perfectly.
Is there anything I can do to improve the battery life? I mean I expect it to degrade (I even took it into consideration when I bought 2nd hand) but I'd think it's a slow linear process and not jumping from 5 days to 1/2 day in a week.
