Li-Ion Battery Charger 120 W



By purchasing this Seacraft Li-Ion battery charger, you have a reliable device at hand, to charge the modular Seacraft battery.

Before operating the this charger, carefully read this manual and follow all instructions given. Manual and proof of purchase should be retained, easily accessible after purchase. 

The manufacturer reserves the right to change the specifications of the device without prior notice, so please check regularly this website for the current version of this manual.

Symbols used in this manual

In order to make reading this manual easier, we use the following symbols to point out certain types of information:

Before use, read the manual!
Keep out of reach of children and minors under the age of 18.
Do not overheat!
This symbol marks important information to avoid severae damages, injuries or even death.
Information on handling of Li-Ion batteries
Information on disposal of this product.

Safety information

Important information for using the charger

Always observe the following information and rules to make sure, that this charger is used in a safe way.

This charger has been designed for the Seacraft GO! scooter with modular battery. Using this charger for other batteries may damage the charger and / or the battery and, in particularly unfavourable conditions, lead to an explosion, fire, and risk to your health or even life!

Every Seacraft battery charger is fitted with a number of labels, pictograms as well as information and warning signs. Their removal from the surface of the device is prohibited.

The charger user is required to replace worn or damaged labels and pictograms with new ones.

The manufacturer is not liable for accidents and damage resulting from incorrect use of the charger resulting from failure to read the charger manual or lack of knowledge on the content of labels, pictograms, warning and information signs, as well as a result of its use in a manner contrary to or deviating from the principles set out in this manual.

Using the charger for purposes other than those set out in this manual or not in accordance with the rules set out in this manual may cause serious personal harm, or even death.

It is forbidden to use the charger in a wet or very humid environment, connecting the charger to the wet devices or with wet hands.

It is highly recommended to use the charger in a clean environment, in order to avoid contamination of the inner charger parts by dust or foreign matter.

During charging you must pay attention and be particularly careful whilst the charger is switched on. It is forbidden to insert hands or any items into the charger’s ventilation grill, such activity can cause serious personal injuries.

Do not disconnect the plugs from the charging socket or mains by pulling the cable, but by holding the connector plug.

The battery charger is an electrical device powered by AC 110 V or 230 V, which can threaten the health or even life of the user.

Using the charger in a situation where the charger cable is damaged can threaten the health or even life of the user.

It is forbidden to use any other chargers to charge the battery, other than that provided by the device manufacturer and dedicated to the specifications of the given battery.

The device is only to be used by adults and should be kept out of the reach of children.


The Seacraft Li-Ion charger with 120 W has the following parameters:

Max. Power120 W
Power supply voltage110/230 V AC 
Output voltage max.37,8 V DC
Charging current max.7,5 A

The charger provides over current, over voltage and short circuit protection.

The connection polarity is arbitrary.

If the battery is discharged below the acceptable voltage (end voltage), the charger may not charge any further.

Charger front panel

Elements on the charger front panel

The charger’s front panel contains the fuse, the ventilator opening and the 2 status LEDs. These LEDs show the current charger status as follows:

LED 1 (AC Input)LED 2 (DC Output)
Grey = Charger not active
Red = Charger switched on
Red = Battery is being charged
Green = Battery not connected
or charging process complete

Using the charger

Check the charger and battery parameters for compatibility. If in any doubt, ask your device’s supplier. 

Make sure the AC power supply is correct. Please note that the mains voltage varies between countries. 

Make sure, you are using the right charger model for the local supply voltage.

Charging procedure

Proceed as follows, to charge your scooter’s battery – proceeding in a different order may not be successful:

  • Connect the charger to the AC mains power supply.
  • The status LED 1 should illuminate as yellow, the AC power state should be indicated by LED2 as red. 
  • Wait about 30 seconds and connect the charger’s DC output to the scooter’s charging socket (the plug’s oriantation is not important – it will work either way).
  • The mentioned delay is important, because the charger will perform a current detection and calibrate itself. This will not happen, if the charger is already connected to the scooter battery.
Charger connected to the GO!
  • When the battery is connected, LED2 will change from green to red after a few seconds. This state means the start of the charging process. Apart from this, you will hear the charger fan working.
  • Observe the charging level indicator on the scooter display to check the charging progress.
  • The charger has a built-in temperature protection. Therefore, do not cover the charger or fan during the charging process and ensure maximum heat exchange. If the internal temperature exceeds 75 °C, the charging process will be interrupted. It is necessary to cool the charger and to repeat the starting sequence to resume it.
  • During the charging process, the red LED 2 may switch off. 
  • The charger recharges the battery with a pulse method i.e. charge / check system.
  • The first few seconds after the battery is connected are used for testing the battery. Charging will not start if the charger finds any incompatibility.
  • You may follow the charging procedure by observing the LEDs on the right side of the scooter display. Each LED stands for approx. 11 % of charging level.
  • The charging procedure ends when the colour of LED2 on the charger changes from red to green. 
  • If for some reason the charging process is interrupted, the charger must be switched off / disconnected from the battery and the mains and then after approximately 30 seconds restarted, as described above. 

If the charging process is longer than usual and the color change of LED2 to green does not occur, then the charging process may not be successful and should not be continued without diagnosing the problem. 

The charging process should be carried out in a ventilated, dry venue at a temperature range of 10/+40 ⁰C.

End of charging (100 %) occurs after the color of LED2 changes to green. 

However, keep in mind that charging to 80 % is much faster. 
Not using the full charge / discharge range increases the durability of lithium batteries.


If the battery charger is not working properly check the following:

  • Are battery and charger connected properly?
  • Please also check, if the safety disconnector inside the scooter is plugged in.
  • Are the battery and charger voltage range correct?
  • Check, if the charger matches the battery specifications and the local supply voltage.
  • Is the battery in „protected” state?
  • This means, that the battery has been discharged deeply and needs to be checked by the Seacraft service.
  • Is the battery overheated?
  • Is the charger’s fuse blown?
  • In this case, you may replace the fuse by a suitable one.

In rare occasions, you might experience a short flash/crackling noise when installing/removing this connector. This is harmless and does not lead to damages.

After analysing the problem and eliminating it, the charger must be disconnected for at least 30 seconds from the battery and mains power supply and then restarted in the correct order as specified in the above instructions. Contact your Seacraft reseller or Distributor, if the problem persists.

In order to preserve the long life of the electrolytic capacitors, the charger must be connected to the mains power supply for at least 10 minutes every 2 months.

Updated on 2023-02-02

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