Does the math work out? If you have a phone battery for only a year, that's 365 charge cycles of a 3000mAh battery. At $0.20 a kWh you end up with less than a

Does the math work out? If you have a phone battery for only a year, that's 365 charge cycles of a 3000mAh battery. At $0.20 a kWh you end up with less than a dollar for a year's worth of power. 3000mAh*3.8v /1000 = 13.3Wh in a phone battery. 13.3Wh * $0.20/kWh * 365 ~= $0.95 a year Even at 10 years of life, it takes a dollar of energy to make a battery at a 10:1 cost? Seems like a fine trade.