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INTRODUCTION

CTEK XS 800 is a switch mode charger with pulse maintenance and is a part of a series of professional 

battery chargers from CTEK SWEDEN AB. These chargers represent the latest technology within battery 

charging. A CTEK XS 800 gives the battery maximum life. 

Read this User’s Manual and follow the 

instructions carefully before you start to use the charger.

SAFETY

• The charger is designed to charge 12 V lead-acid batteries from 1.2 to 32 Ah. However, the charger can 

maintain batteries up to 60 Ah.  Do not use the charger for any other purpose.

•  Wear protective glasses and turn your face away when connecting or disconnecting the battery!

•  It is important to avoid sparks in the immediate vicinity as the battery can give off explosion gases during 

charging. 

•  Battery acid is corrosive. If the acid comes into contact with the skin or eyes, rinse immediately with plenty 

of water and contact a doctor at once.

•  Provide good ventilation when charging.

•  The charger should not be covered.  

•  Do not put the charger on the battery when charging.

•  Never charge a frozen battery.

•  Mounting only allowed on a plane surface.

•  Children must not use the battery charger, except under the supervision of an adult.

•  The battery charger may only be used if you have read and understood the manual.

•  The appliance is not intended for use by infirm persons without supervison.

BATTERY TYPES 

The following recommendations should only be considered as guidelines. In the event of uncertainty always 

refer to the battery manufacturer’s recommendations.

CTEK XS 800 is suitable for charging all types of 12 V lead-acid batteries: open batteries, MF, AGM and 

most GEL-batteries. Battery sizes from 1.2 to 32 Ah. The charger can maintain batteries up to 60 Ah.  

CHARGING

Connecting the charger to a battery fitted in a vehicle:

1. 

The power cord should be disconnected when the battery leads are connected or disconnected.

2. 

Identify the pole that is grounded (connected to the chassis). The negative terminal is normally the 

grounded pole.

3. 

Charging a negative grounded battery. Connect the red cable to the positive pole on the battery and the 

black cable to the vehicle’s chassis. Ensure you do not connect the black cable close to the fuel pipe or the 

battery. 

4. 

Charging a positive grounded battery. Connect the black cable to the negative pole on the battery and 

the red cable to the vehicle’s chassis. Ensure you do not connect the red cable close to the fuel pipe or the 

battery.

Connecting the charger to a battery that is not fitted in a vehicle:

1. 

The power cord should be disconnected when the battery leads are connected or disconnected.

2. 

Connect the red cable to the positive pole on the battery and the black cable to the negative pole.

Start charging

1.  

Once you have checked that the battery leads have been connected correctly, you can start charging by 

connecting the charger to the wall socket. If the battery leads have been connected incorrectly the polarity 

reversing protection will ensure that neither the charger nor the battery will be damaged. The fault indicating 

lamp   will then come on. If this is the case, start from point 1 under ”Connecting the charger...” 

2. 

The charging lamp 

 or the maintenance charging lamp 

 will now come on. When the maintenance 

charging lamp comes on the battery is fully charged. When the battery’s voltage drops the charger will send 

a pulse to the battery. The pulse length depends on how much the voltage has dropped. The charger can be 

connected for months.

3. 

If nothing happens. If none of the lamps come on this may be due to the connection to the battery or 

chassis is poor or that the battery is faulty or has a too low terminal voltage. Another cause may be a lack of 

voltage in the wall socket..

4. 

Charging can be stopped at any time by disconnecting the charger’s power cord. Always disconnect the 

power cord before disconnecting the battery leads. When you stop charging a battery fitted in a vehicle you 

should always disconnect the battery lead from the chassis before you disconnect the other battery lead.

5. 

If the charging lamp and maintenance charging lamp alternately flash the reason for this is the following:

•  

If the lamps flash a few times per second then the battery is probably sulphated. If the lamp flashes more 

than 60 minutes the battery should be replaced.

•  

If the flashing occurs with a few minutes’ interval then the battery has a high self-discharge and may need 

to be replaced..

Switch mode

BATTERY CHARGER

For lead-acid batteries 1.2-32 Ah

CTEK XS 800

 

User’s Manual and guide to 

professional battery charging of 

starter and deep cycle batteries.

UK

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