A:Answer Mine was 10 Watts as well, and that's what Motorola includes with all of the phones as far as I know. The phone supports up to a 15W charger, which should theoretically charge at about a 50% faster rate, approximately.
The battery is 5000 mAH (milliamp hours) which is quite a bit of battery power for a phone. That's equivalent to 5 amp hours. 10 watts at 5 Volts DC is 2 amps, and you're taking a battery that's down to 30% (1500 mah) back to a full charge... that's going to take a bit longer than other phones because the battery is so big. So a charger that's capable of 2A charging for 1.5 hours = 3AH, or 3000 mAh for a total of about 4.5AH, or 4500mAH. Close enough to 5000mAH given battery recharging capabilities.
A 15 watt charger at 5 vdc is 3A. That's a 50% increase in output. But when we compare charging times, what does this gain you? 3A per hour, or 3000 mAH from 30% (1500mAH) means it will take about an hour vs. hour and a half to recharge to the same point. (Battery recharge rates are not linear, so these values are approximate.) It's faster, but it's still going to take a while because the battery is so big.
An alternative is to plug in randomly throughout the day to get a bit of a charge here and there. I do this sitting at my desk at work, or when I'm running around town in my vehicle. I rarely see 80% or less this way, but I typically plug in when I sleep at night.
Hope this helps.
