LEMFO LEM3/ZEBLAZE BLITZ battery drain - need help

Hello, guys!

I have a Lemfo Lem3/Zeblaze Blitz for more than 8 months and now it suddenly become to present a lot of battery drain. It usually consumed 33% of battery on a 10km run with gps and screen on (minimum bright), but now I can’t complete 8km with full battery. All functions (wifi, bluetooth, display, sound, etc.) are normal, except for this. I tried to factory reset the watch but the problem persists…
Is there any solution? Perhaps an app I can use to calibrate the battery?