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From The FunKey Wiki
Battery
We're proud to announce we have finally chosen a battery for the FunKey S! Since most of the batteries that we tested couldn't hold the capacity that they claimed to, we decided to order custom 410 mAh batteries. With this battery, the average gameplay session on a full charge lasts between an hour and a half and two hours. Actual battery life depends on which settings are enabled and which system is being emulated, so while the device only lasts an hour and ten minutes under a stress test that uses 100% of the CPU at maximum brightness and audio levels, in a more realistic situation, such as Game Boy emulation (20% CPU usage) at a 50% brightness level and 40% sound level, the device can easily last over two hours on a single charge!