Identifying exactly how much energy is left in a battery is not easy. A voltmeter is useful but will only indicate that the battery is flat when it is too late. In order to keep an accurate record of what is stored in a battery it is necessary to keep account of all the factors that affect it and this is a complex matter. Once a reliable reading of the state of charge of the battery is available however, life starts to get an awful lot less complicated.
- Battery voltage (V)
- Battery charge/discharge current (A)
- Consumed Ampere-hours (Ah)
- State of charge of the battery (%)
- Time to go (until the battery it flat at the present rate of
- Battery temperature