Skoda 2011 Yeti Owner's Manual page 204

Charging the battery
A properly charged battery is essential for reliably starting the
engine.
– Read the warning notes 
– Switch the ignition and all electrical components off.
– Only for "quick-charging": Disconnect both battery cables (first of all "negative",
then "positive").
– Carefully attach the terminal clamps of the charger to the battery terminals (red
= "positive", black = "negative").
– You can now plug the mains cable of the charger into the power socket and
switch on the charger.
– When charging is completed: switch the charger off and unplug the mains cable
from the power socket.
– Only then should you disconnect the terminal clamps of the charger.
– Reconnect the cables to the battery (first of all "positive", then "negative").
It is not normally necessary to disconnect the cables of the battery if you recharge
the battery using low amperages (as for example from a mini-charger). Please also
refer to the instructions from the charger manufacturer.
A charging current of 0.1 of the total battery capacity (or lower) is that which should
be used until full charging is achieved.
It is, however, necessary to disconnect both cables before charging the battery with
high amperages, so-called "quick-charging".
"Quick-charging" a battery is "dangerous" 
page 200. It requires a special charger and specialist knowledge. We recommend
having the quick charging of vehicle batteries undertaken by a specialist garage.
A discharged battery may already freeze at temperatures just below 0 °C 
recommend that you no longer use a battery which has thawed out because the
casing of the battery may be cracked through the formation of ice and this would
allow battery electrolyte to flow out.
The vent plugs of the battery should not be opened for charging.
WARNING

Never charge a frozen or thawed battery - risk of explosion and caustic
burns. Replace a frozen battery.
Using the system Safety
in "General information" on page 200 and 
in "General information" on
Driving Tips
WARNING (continued)

Never charge a battery which has a too low electrolyte level - risk of explo-
sion and caustic burns.
.
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 222, fig.
Disconnecting and reconnecting the battery
On disconnecting and reconnecting the battery the following functions are initially
deactivated or are no longer able to operate fault-free.
Operation
Electrical power window (operational faults)
Enter the car stereo/radio navigation system
code number
Set hours
Data in the multi-functional indicator are
deleted.
We recommend having the vehicle checked by an authorised Škoda Service Partner
to ensure full functionality of all electrical systems.
Replacing the battery
. We
When replacing a battery, the new new battery must have the same capacity,
voltage (12 V), amperage and be the same size. Suitable types of vehicle battery are
available from an authorised Škoda Service Partner.
We recommend you have a battery change carried out by an authorised Škoda
Service partner, who will properly install the new battery and dispose of the original
one.
General Maintenance
Inspecting and Replenishing
186.
Operating measure?
 page 45
see operating instructions for the
car stereo/radio navigation sys-
tem
 page 18
 page 19
Breakdown assistance Technical data
203