Extended batteries offer extra hours of use per charge for your smartphone, something that – for many – is worth quite a bit.  Fortunately, if you’re a Samsung Galaxy S III owner, this benefit doesn’t have to cost much at all.

At $22, the QCell Samsung Galaxy S III Extended Battery Kit is a bargain.  For that price you get not only a 4200mAh Li-Ion battery (double the capacity of the included battery), but two replacement battery covers for the phone: one blue, one white. 

The battery is also NFC friendly, so you’re ready to go with Google Beam and Google Wallet – if you use either feature.

The Amazon.com reviews are glowing, with five out of five stars as of this writing.