Tools
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            Remove the SIM card tray and the memory card try. 
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            Use a screwdriver Torx T2 and remove the screw under the SIM card tray. 
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            Use plastic tools and start the separating the back cover from the top side. 
 
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            Disconnect the battery flex cable. 
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            Unstick the metal foil from the logic board. 
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            Use a plastic tool with a thin tip and unstuck the battery from the middle frame. 
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            Battery - BP-4GWA, 2000mAh, 3.7V, 7.4Vh 
 
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To reassemble your device, follow these instructions in reverse order.
3 comments
I have nokia lumia 720....it can't starting up only shows charging sing..... plz...help me
i have also the same problem is ur problem fixed now ..then pls tell me the solution
Hey guys I really need to know if you can recommend a trusted retailer of spare BP-4GWA here in South East Asia. I am currently residing in the Philippines and it's just hard to buy from Ebay and Alibaba without anyone's opinion. TIA!