HONDA 2014 Accord Hybrid - Owner's Manual - Manual (Page 453)

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High Voltage Battery
The High Voltage battery gradually discharges even if the vehicle is not in use. As a
result, if your vehicle is parked for an extended period of time, the battery charge
level will become low. Extended periods of time at a low state of charge will shorten
battery life. To maintain the battery state of charge, drive your vehicle for more than
30 minutes at least once every three months.
Extreme high temperatures can affect the battery life. You can minimize the affects
by parking the vehicle in the shade during the summer. 1 High Voltage Battery
Be careful not to let the High Voltage battery drain
too much. If the battery level becomes close to zero,
it will make it impossible to start the engine.