inputs.text: device limitations - fully charged device ac 100 motorola razr maxx 40 battery left used device recharge razr charged razr maxx 70 device depleted fairness realize razr maxx largest internal battery smartphones available would expected device deliver 30 charge 40 30 70 purpose purchased device guess remain situation need power phone none available charge device work short term use considering size razr maxx battery 30 charge would provide several hours either data voice use