1 First turn on your phone and tap \"Settings\" on your desktop.
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2 Go to your phone's Settings, find and tap the \"Battery\" option.
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3 On the battery options screen, locate Dual Engine Flash Charge and tap to enable the function.
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First, tap the Settings icon from your desktop to access the Settings function.
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two
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Once in the Settings screen, tap the battery option inside.
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three
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On the battery interface, go down to find the two engine flash charge a few words, at this time, it is found that the button on the right is gray.
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four
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Turn the gray slider to the right, so that the flash charge mode is turned on, and when recharging, you can greatly save time