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I wouldn't worry about it yet, wait until you have depleted and recharged the battery a few times.
I find the battery meter on my Glo is not very accurate above 90% or below 30%, although the battery life is fine. I think the battery meter just measures the voltage, rather than the remaining capacity, and at the extremes the relationship between voltage and remaining capacity is not even close to linear.
Also the charging seems to be done in steps using different methods, with the final step above 90% omitted if the battery is already well charged, to avoid overcharging. I find if I plug my Glo in with the battery already at 90% the meter just goes straight to 100%, and then when I unplug it goes back to 90% in a few minutes. To get a completely full charge I have to deplete the battery well below 90% and then charge without interruption to 100%.
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