Mascot 12V / 4A automatic desktop charger - Universal for lead-acid batteries (AGM, gel, VRLA)

This compact 12V desktop charger with 4 amp charging current is the ideal all-rounder for maintaining and charging medium-sized lead-acid batteries. It bridges the gap between small maintenance chargers (often only 0.8 A) and large workshop chargers. With 4 amps it charges car, motorbike and service batteries quickly without subjecting them to thermal stress.

Thanks to the intelligent, microprocessor-controlled IUoU charging curve, the device operates fully automatically: It charges the battery up to the final charging voltage and then automatically switches to maintenance mode. This means the charger can be left connected permanently (e.g. for overwintering) without overcharging the battery.

Highlights at a glance

• Universally applicable: Suitable for all 12V lead-acid types: wet batteries (car), maintenance-free MF, AGM, VRLA and gel batteries.
• 3-stage automatic: Charges with constant current (main charge), constant voltage (saturation) and switches to "floating" (maintenance charge).
• Optimal charging current (4A): Perfectly dimensioned for battery capacities of approx. 12 Ah to 80 Ah. Charges quickly, yet gently on the battery.
• Safety package: Protection against reverse polarity (incorrectly connected clamps), short circuit, overheating and sparking.
• LED status display: Easy control of the charging status (e.g. Red = Charging / Green = Full / Yellow = Error).
• Compact design: The lightweight plastic housing fits on any workbench or in any shelf ("desktop unit").

Areas of application

The 4A charger can be used in many ways in the hobby and private sector:

• Car & motorbike: For recharging the starter battery or for maintaining the charge of seasonal vehicles (convertible, classic car).
• Lawnmowers & ride-on mowers: Ideal for the starter batteries of garden tools in winter.
• Leisure & hobby: For 12V batteries in bait boats, echo sounders, camping power supplies or small solar systems.
• Rehab & mobility: (If the appropriate plug is available) for smaller electric vehicles or stairlifts with 12V system.

Installation & Safety Instructions

• Connection sequence:
  1. Connect the red clamp (+) to the positive terminal of the battery.
  2. Connect the black clamp (-) to the negative terminal.
  3. Only now plug the mains plug into the socket.
• Ventilation: When charging open lead-acid batteries, explosive gases (oxyhydrogen) may be generated. Only charge in well-ventilated rooms and avoid open flames or sparking.
• Indoor use: The device is (mostly) not waterproof (IP20). Protect it from wetness and moisture.
• Defective batteries: The charger often only recognises deeply discharged batteries above a certain residual voltage (e.g. 2V). For safety reasons, a completely "dead" battery (0V) is often not charged.

Features

FAQs about the 12V 4A lead-acid charger

Can I use it to charge my lithium battery (LiFePO4)?

No, better not. Lead-acid chargers often have a desulphation function (high voltage pulses) or a float voltage that is too high, which can confuse the BMS (battery management system) of a lithium battery or damage the cells. Always use a special LiFePO4 charger for lithium batteries.

Can I leave the charger on the motorbike all winter?

Yes. As soon as the battery is full (green LED), the device switches to maintenance charging. It then only delivers tiny impulses of current to compensate for self-discharge. This is perfect for winter storage.

How long does it take to charge a car battery (60 Ah)?

With a charging current of 4 amps you can roughly calculate: Capacity / charging current + losses. 60 Ah / 4 A = 15 hours. In practice it takes a little longer (approx. 18-20 hours) as the current drops towards the end. However, for a quick "jump start charge" 1-2 hours are often enough.