Help Charging with a backup power supply

[Suncrow]

Hey folks- Just purchased a backup power supply with adjustable charge rate and did not want to fry my MAXX battery, so I was wondering what charge setting should I use on the power supply? It has 5.0, 6.5, 9.0 and 12.0 volts. Can't seem to find a spec on my current charger....
Thanks!

 

[Grey1001]

the wall wart for my reg RAZR says 5.0 on it

 

[Suncrow]

Thanks Grey. That's what i thought I was seeing. Cheers!