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Most batteries I’ve seen is 3.7v. My new replacement 3000mah one says 3.8v. Is the increase of a tenth of a volt cause for concern? The battery says +LG 405570 3.8v 3000mah. It also doesn’t match the text from the picture in the ebay auction which started with UK something.

@zombietechie as long as it fits, it would be fine. Biggest issue here will be the charging time. The replacement battery you are referring to is a bit over 3 times as many mAh as the original. This is very difficult to achieve within the same size parameter. Make sure that these numbers a legit. The voltage is fine and will not cause you any issue.

See if you can use the iOS option using Coconut Battery and get a better idea of what this battery is doing. https://www.coconut-flavour.com/coconutb