When Nokia launched its new Windows Phones 8 models, the Lumia 620, 820 and 920, the battery's were a bit smaller than the latest generation of smartphones. The newer Lumia models, the 520 and 720 have rectified this. The 4.3-inch Lumia 720 has a 2000 mAh battery, the same one which is found on the Lumia 920.
The WVGA (480 x 800) display of the Lumia 720 is not as impressive as the HD displays you find on many of todays phones of a similar size, but lower resolution displays do consume less battery power. Coupled with the power efficient dual core Qualcomm Krait processor and large battery, the Nokia Lumia 720 promises very good battery life.
GSM Arena's recently concluded the battery life test on the Lumia 720 and this is how it fared:
Sony Xperia Z - 16 hours and 3 minutes
LG Optimus G - 15 hours and 30 minutes
Nokia Lumia 720 - 15 hours and 17 minutes
Samsung Galaxy S 4 - 13 hours and 53 minutes
HTC One - 13 hours and 38 minutes
Apple iPhone 5 - 8 hours and 42 minutes
The talk time of the Nokia Lumia 720 is impressive enough...
HTC One - 9 hours 58 minutes
Apple iPhone 5 - 9 hours and 56 minutes
Samsung Galaxy S4 - 8 hours and 42 minutes
Nokia Lumia 720 - 7 hours and 37 minutes
Sony Xperia Z - 6 hours and 27 minutes
LG Optimus G - 5 hours and 15 minutes
... the web browsing results are a bit disappointing. The 2300 mAh battery of the HTC One has to power a Full HD display and still comes out ahead by over two hours. Similarly, the small 1440 mAh battery on the Apple iPhone 5 has to power a higher resolution 640 x 1366 display, and still the iPhone does over two hours better in web browsing.
Samsung Galaxy S 4 - 10 hours and 16 minutes
Apple iPhone 5 - 10 hours and 12 minutes
HTC One - 10 hours and 2 minutes
Samsung Galaxy S III - 9 hours and 27 minutes
LG Optimus G - 7 hours and 30 minutes
Nokia Lumia 720 - 6 hours and 43 minutes
Sony Xperia Z - 5 hours and 39 minutes
The results of the video playback are even less impressive than web browsing.
Standby (with 1 hour of calls, video playback and web browsing per day)
Samsung Galaxy S 4 - 63 hours
Nokia Lumia 720 - 60 hours
Apple iPhone 5 - 51 hoursSamsung Galaxy S III - 50 hours
HTC One - 48 hours
Sony Xperia Z - 48 hours
LG Optimus G - 45 hours
The Lumia 720 does redeem itself in standby time.
Overall, I cannot say I am disappointed with the Nokia Lumia 720's battery life, I was expecting it to do a bit better.
Source: GSM Arena