Tuning Sehkment Gauges

I have 2 Sehkment gauges.
The 28mm (fill) is perfect. Battery lasts for weeks. I also has a new 25mm (second reg) gauge. Battery in it is a piece of crap. It lasts about 1 ½ hours of shooting, and I have it “sleeping” at 10 seconds. I constantly have to put the charger on it during my shooting. I’m going to take it off an put on a different digital gauge.

 
I have one of those as my second reg gauge on one of my Impacts. It’s a cheesy thing but has been working flawlessly for maybe three months now. Even came with an extra battery. Haven’t had to change it yet. Figured I would try one hoping it’s simplicity would be a strong point.
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Can you tell more about that gauge from Aliexpress? It looks exactly like the Airmarksman but for 2/3 of the price.

Thanks