Battery of my Instinct 2s solar (software v 14.2) is discharging under 20h in standard (no activity) mode, even in power save mode.

The Troubleshooting guide for high battery drain could perhaps help you

Thanks. I followed these steps. So far I don't see an improvement – the battery is still draining crazy fast. I'll let it discharge fully and repeat.

samiuelson said:

Thanks. I followed these steps

I doubt. The most important instructions tell to make a soft-reset and to go through the full charging cycle (overcharging for at least an hour, and then using the watch till it shuts down). I do not believe you managed to do it in 3 hours. If the watch died just minutes after having it overcharged, then the battery is dead, and you will need to contact the Support.

Nothing has changed. The battery lasts for 20 hs after a full charge

In that case, have a look at the other hints in the troubleshooting guide. Including the last one - contacting the Support, if nothing of the previous tips helped.