The Mi 8 and 8se batteries are not universal
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The Mi 8se uses a 3120mAh battery that supports QC3.0 fast charge. The Mi 8 uses a 3400mAh battery that supports QC4.0 fast charge, both of which are different
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Mi 8se is an integrated mobile phone with built-in battery, you can not disassemble the battery, if the battery is damaged, you can go to the Xiaomi after-sales service center, or the mobile phone repair shop for replacement