2020 iPhones Could Come with an Even Bigger Battery<img style="float: left; margin-right: 10px"  src="

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Apple might end up using custom battery protection module from ITM Semiconductor which could be almost 50% thinner and lighter in size. This could allow Apple to free up more space internally which could be used to slightly bump the battery capacity.   
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2020 iPhones Could Come with an Even Bigger Battery