Skoda Roomster Owner's Manual page 158

Vehicles with a START-STOP system are fitted with a battery control unit for
checking the energy level for the recurring engine start.
We recommend that you have the acid level checked regularly by a specialist
garage, especially in the following cases.
›
High external temperatures.
›
Longer day trips.
›
After each charge.
Winter time
The vehicle battery only has some of its starting power at low temperatures. A
discharged vehicle battery may freeze at temperatures just below 0 °C.
We therefore recommend that you have the battery checked and, if necessary,
recharged by a specialist garage before the start of the winter.
CAUTION
For technical reasons, on vehicles with the description "AGM", the electrolyte
level cannot be checked.
Note
The battery acid level is also checked regularly by a specialist garage as part of
the inspection service.
Charging

Read and observe and
A properly charged vehicle battery is essential for reliably starting the engine.
›
Switch off the ignition and all of the electrical components.
›
Disconnect both battery cables ("negative" first, then "positive") only when
"rapid charging" the battery.
›
Attach the terminal clamps of the charger to the battery terminals (red =
"positive", black = "negative").
›
Plug the mains cable of the charger into the power socket and switch the
charger on.
›
Once charging is complete: Switch off the charger and remove the mains ca-
ble from the power socket.
›
Only then disconnect the charger's terminal clamps.
›
Reconnect the cables to the battery (first "positive", then "negative").
It is not necessary to disconnect the battery cables if you are recharging the
vehicle battery using low amperages (for example from a mini-charger). Refer
to the charger manufacturer's instructions.
on page 153 first.
A charging current of 0.1 multiple of the total vehicle battery capacity (or low-
er) must be used until full charging is achieved.
Both cables must be disconnected before charging the battery with high
amperages, known as "rapid charging".
The vent plugs of the vehicle battery should not be opened for charging.
WARNING
"Quick-charging" the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
CAUTION
On vehicles with the START/STOP system, the pole terminal of the charger
must not be connected directly to the negative terminal of the vehicle battery,
but only to the engine earth » page
START-STOP system.
Note
We therefore recommend that vehicle batteries be rapid charged by a special-
ist garage.
Replacing

Read and observe and
The new vehicle battery must have the same capacity, voltage, current and
size as the original battery. Suitable vehicle battery types can be purchased
from a specialist garage.
We recommend having the battery replaced by a specialist garage, where the
new vehicle battery will be installed properly and the original battery will be
disposed of in accordance with national regulations.
Disconnecting or reconnecting

Read and observe and
The following functions are initially deactivated or are no longer able to oper-
ate faultlessly after the vehicle battery has been disconnected and reconnec-
ted.
173, Jump-starting in vehicles with the
on page 153 first.
on page 153 first.
Inspecting and replenishing

155