Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 206

Recommendations when handling the high-voltage
battery:
Only charge the high-voltage battery with
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direct current (mode 4) if necessary.
If leaving the vehicle idle for lengthy periods,
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park up the vehicle with a high-voltage battery
charge level between 25% and 30%. Do not
keep the high-voltage battery continuously
connected to power supply equipment.
If leaving the vehicle idle for lengthy periods of
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time avoid, if possible, high ambient tempera-
tures.
Check the high-voltage battery's charge level
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every six weeks ( page 220).
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Charge the high-voltage battery if the charge
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level is below 15%.
Do not disconnect the 12 V battery even if the
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vehicle is left idle for a lengthy period. Other-
wise, the condition of the vehicle's high-volt-
age battery cannot be monitored.
If the high-voltage battery is only used with
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low charge levels, fully charge the high-voltage
battery every six months.
Depending on the equipment and national ver-
sion, your vehicle is equipped with one of the fol-
lowing vehicle sockets:
Type 1 for charging with alternating current
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(mode 2/3)
Combo 1 for charging with alternating current
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(mode 2/3) and charging with direct current
(mode 4)
Type 2 for charging with alternating current
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(mode 2/3)
Combo 2 for charging with alternating current
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(mode 2/3) and charging with direct current
(mode 4)
Driving and parking 203
Combo 1 vehicle socket