Hey there! iFixit employee here. I just tested several batteries in benches, and I haven't seen any issues with showing usage. If you haven't already, hold the power and home buttons to do a full reset, and see if that solves the issue. If you don't have any luck with that, you may actually have some minor logic board damage.
Hope this helps, and remember not to take everything an Apple Tech will tell you at face value. Happy repairing!
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