WalMart does not sell the PX12072 battery, but they are available from Amazon.com and Sears, as of 2015. The price of the PX12072 at Amazon.com is about $18, and the same at Sears is about $29.
This battery is a replacement for the Verizon Fios battery. This battery lasts for about a year, according to user reviews, and for those who buy on Amazon.com, this battery comes with a year warranty. The reviews for this battery are high, with 3.8 stars out of 5 stars, and these reviews come from about 300 customers. More than 50 percent of these customers have given the PX12072 battery 5 stars, and 17 percent have given it 4 stars.