GRZ615G 2nd battery led blinking

[jplans]

Hello,

I just wonder why if I have not installed any 2nd battery in my GRZ615G not only LED keeps blinking, but it now appears that I've got two batts and my total autonomy has raised up to 24 hours !?! I am a bit worried beacuse excepting that, everytihng works fine, so I do not see any possible issues.

Any ideas ?

Thank you