Although the HP Pre3 was only officially released throughout Europe for just a few days before HP pulled the plug on webOS hardware, a lot more AT&T (and a few Verizon) Pre3s made their way to eBay and other "unofficial" channels. Unfortunately, since HP will not support the device or make any additional accessories for it, it appeared as if spare or extended Pre3 batteries would never see the light of day, even if you simply needed a replacement for a defective battery. Luckily for us Pre3 owners, Mugen Power Batteries decided to produce two sizes of extended batteries, the 1400 mAh "SL" extended battery for $46.95 and a 2800 mAh "XL" extended battery for $98.95. As compared to the stock Pre3 battery that clocks in at 1230 mAh, these batteries will give you an additional 14% or 128% of battery life, respectively, before your phone needs to be plugged back in. The 1400 mAh SL battery--which we previously reviewed--is only slightly bigger than the stock battery, essentially making it more of a spare battery than an extended battery. With no other source of spare batteries for the Pre3, having this option for a spare or replacement battery is great. In addition, since Mugen's SL battery is the same physical size as the stock Pre3 battery you can continue to use your existing touchstone-enabled back cover for the Pre3 with no issues
However, if you are looking for some more heavy-duty battery life for your Pre3, you may instead want to consider the 2800 mAh XL battery from Mugen. After putting our review battery through its paces, our overall reaction was quite favorable. While the battery's capacity is twice the size as the SL extended battery, it is also physically bigger, weighing 1.7 ounces (48 grams) as compared to .85 oz (24 grams) of either the stock or SL extended battery. As a result of the larger size, it also requires a larger back cover for the phone which is included with your purchase. For this review, we will focus on both the affects on battery life but also the affects of the larger back cover.
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