Husqvarna Automower Technical Manual page 21

A new battery has a battery capacity of about 2200
mAh. As the battery ages the battery capacity
decreases. The battery capacity drops slowly to about
1800 mAh, after which it drops more rapidly. If the
displayed battery capacity is about 1800 mAh or lower
it is probable that the battery is spent and needs to be
replaced. Note that the values are approximate and
vary from mower to mower and presume that the
measurement is made in accordance with the
description.
IMPORTANT INFORMATION
Note that the threshold value of 1800 mAh is
purely a guide value and that the battery
capacity can vary from mower to mower
When replacing the battery, you should reset Trip Op.
counters. The value for Chargings OK, which is a
measurement of the age of the battery is then reset,
both on the main counter and on the trip counter. A
battery can normally take 1000 – 2000 charges.
1. Function
Automower from 21
™