Android's flagship smartphones tend to have a battery life problem. The standard often isn't how many days they can last, but whether they can make it through a single one. Budget smartphones, with their weaker processors and lower screen resolutions, often last longer—but not everyone is willing to sacrifice performance and picture quality for battery. Those people can instead slap an external charger to the back of their phones and wrap it up with plastic. We call this approach buying a ZeroLemon case.The company, which also produces solar-powered external battery packs, has announced oversized cases for two additional phones: the Nexus 6 and the LG G4. The former gets a relatively slim 3,500mAh case that's currently selling on Amazon for . ZeroLemon says this should extend the phone's battery life by 75%.

The LG G4 gets a more substantial 8,500mAh suit of armor priced at . Here, ZeroLemon's goal is to provide three times the capacity of the device's original battery.

Since these are cases, they provide you with added protection against drops and everyday abuse. As for whether you should buy one, that depends on the size of your purse or pockets.

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Source: Nexus 6 ZeroLemon 3500mAh case on AmazonLG G4 ZeroLemon 8500mAh case on Amazon