Honda ELECTRIC 2019 Owner's Manual page 18

High Voltage Battery
The High Voltage battery gradually discharges when the vehicle is not in use. If allowed to discharge too much, the battery may become
damaged.
If your vehicle is parked for an extended period of time, during storage for example, periodically recharge the battery to maintain sufficient
charge levels. At least once every three months, recharge the High Voltage battery.
Excessive heat can also damage the battery. On hot, sunny days, try to avoid parking your vehicle under direct sunlight.
If the High Voltage battery becomes fully discharged or damaged and you are unable to start the power system as a result, consult an
authorized Honda Clarity Electric dealer.
Temperature
When storing the vehicle, make sure not to expose it to extremely low temperatures: If the temperature of the High Voltage battery drops
to –22°F (–30°C) or below, the power system may not start. Wait for the High Voltage battery to warm up, or warm it up by plugging in the
vehicle.
If the temperature of the High Voltage battery drops to –31°F (–35°C) or below, the power system will not start. Wait for the High Voltage
battery to warm up or move the vehicle to a warmer location. Note plugging the vehicle in will not help in this case.
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