New battery shows lower capacity?

Ive got an s6 edge which is about 3 years old now and i just installed a brand new battery, its an original from samsung and theres written 2600mah on it, but when measuring the mah with accubattery it shows around 1600mah estimated capacity, the battery feels longer but im not sure what to think anymore, i fully... show more Ive got an s6 edge which is about 3 years old now and i just installed a brand new battery, its an original from samsung and theres written 2600mah on it, but when measuring the mah with accubattery it shows around 1600mah estimated capacity, the battery feels longer but im not sure what to think anymore, i fully discharged and charged overnight.
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