Default WinCE battery status

Hi everyone! I have a small problem with my Launch Diagun scanner. It works on WinCE 3.02.000. Battery status doesn't work. It always says that my battery is good even just few mins before battery is totally discharged. It should show battery icon when battery level is lower that 40% but it doesn't. It looks like this all the time. I hope someone can help me with it because i have no idea what to do. Thanks
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