Accessory Charging with a backup power supply

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http://androidforums.com – 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! (General)