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Battery draining quickly when updating firmware to ver 13.0 ?

Hello

Previously, my Garmin 945 watch, after fully charged, can be used for about 5-6 days with these daily activities such as cycling, walking for an average of 1h-1h30'/activity.

Now when updating to ver 13.0 via Garmin Express, it only works for two days. Does everyone have the same problem?

I want to revert to the old software version, how do I do that ?

Thanks