Getting the battery out is extremely tricky, why do LG glue it in place so strongly, a couple of pieces of slim double sided tape would suffice. Fortunately I have an iFixIt black spudger that I was able to slowly pry the battery out with, starting at the top and working my way down to the bottom, if the old battery wasn't any good before I started, it certainly isn't now as I had to bend the battery quite a lot to get it out. Take it slowly and carefully and you will get there.
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