We label batteries with capacity in cases where said capacity is tiny compared to user's needs. It allows user to guesstimate if their phone will last 1 or 2 da

We label batteries with capacity in cases where said capacity is tiny compared to user's needs. It allows user to guesstimate if their phone will last 1 or 2 days on a single charge. For AAA batteries, which in typical use last at least several months the exact capacity number becomes largely irrelevant.