V-TAC VT-5555 Manuel D'instructions page 23

Maintenance - Charging dock pins, Down view sensor, Drive & universal wheel
Warm Tip: The interior of the charging pole piece, the down-view sensor and the striking plate all contain sensitive electronic
components, please use dry dishcloth when cleaning, and do not use wet dishcloth to prevent damage caused by water inflow.
Clean up charging dock pins
FIG 28
Clean the down-view sensor
FIG 29
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Clean drive wheels and universal wheel
If you do not use the product for a longtime, please fully charge
it before storing. Turn off the host and charge the device every
3 months to prevent the battery from over discharge.
If the battery is over discharged or is not used for a long time,
the product may not charg. Please contact our company for
after-sales maintenance, do not disassemble it yourself.
FIG 30