Old news but worth emphasizing. OEM batteries test at or very near stated capacities. Aftermarket batteries are a total scam. Sedio and Mugen batteries typically test at about 80% of stated capacity. Fake OEM batteries are even worse. This type of dishonesty really "gets my goat". This should be all of the scientific evidence you need:
BatteryBoss Calls Out False Capacity Claims!
Please, DO NOT support these scammers.