Description
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Battery type: Li-Ion (Lithium-ion) rechargeable battery — common smartphone battery type.
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Capacity (original J7 2015): ~2600 mAh — solid for basic daily use like calls, browsing, and light apps.
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Removable (original J7 2015 & some 2016 models): Yes — battery can be taken out and replaced easily.
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Capacity (J7 2016 variant): ~3100 mAh, removable — longer usage time compared with the original.
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Capacity (J7 2017): 3000 mAh, non-removable design — sealed inside the phone.
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