The most popular after market battery supplier and extended battery maker, Mugen has released a massive 2,800 mAh battery case for the Motorola Moto X, that promises twice the runtimes over the original battery. The case manufacture claims that it can provide more than 127 percent over its original battery.
The Moto X Extended Battery Case retails for USD 89.50 and is now up for pre-order. Expected shipping date is March 14 if you order now.
The Android phone ships with a 2200 mAh battery which is good enough if you are an average user. The battery case provides an extra 2800 mAh of juice, bringing the total power to 5000 mAh. The only downside is extra weight and bulk but if you are a heavy user, you might want to take a look at it.