At Back Market, we work with some of the best refurbishers in the US and around the world. All phones sold on Back Market are tested and diagnosed, and each battery is checked to be at least 85% at the moment it's in your hands during the withdrawal period.
If a device's battery does not meet the minimum of 85% battery health at this time, it will be replaced with a new battery by the seller before it's listed and sold on Back Market.
After this period of time, the battery will decrease progressively depending of the use you will have. During the first 6 months, the battery should not decrease under 80%. Please not that after 6 months, the warranty health is not covered by the merchant anymore.
Also note that battery performance will vary depending on the age of the device. Updates to the operating system of an older device will require more storage space, processing power, and will therefore consume more battery to run and operate normally. Because updates to the operating system can be more demanding on the device's processor, the battery on older devices can drain much more quickly, and in some cases, the battery may discharge completely.
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