ES Energysafe Premium 6V/12V 6A Battery Charger – DUO Maintainer for Lead-Acid and LiFePO4 Lithium

ES Energysafe DUO Premium 6V/12V 6A battery charger: lead-acid and lithium with hook and magnet

This battery charger from the ES Energysafe Battery range combines charging and battery maintenance in a single fully automatic unit, with touch buttons and an LCD display. It is designed to keep the battery of your motorcycle or car in good condition when the vehicle sits unused for long periods, for example over the winter, and to recharge it after it has gone flat. It works with 12V lead-acid, AGM, GEL, EFB and LiFePO4 lithium batteries, and small 6V lead-acid batteries.

Charging modes of the charger and maintainer

The unit has two touch buttons: MODE, to choose the charging program, and FUNCTION, for the special functions. The FUNCTION options can only be changed while the charger is not connected to the battery. The 12V STD, 12V LFP and 12V AGM modes can also be switched with the battery connected; 6V STD, Maintain and Recond only with the charger disconnected.

Charging programs (MODE button)

• 12V STD: up to 14.4 V, for standard 12V lead-acid batteries.
• 12V LFP: up to 14.6 V, for 12V lithium iron phosphate (LiFePO4) batteries.
• 12V AGM: up to 14.8 V, for 12V AGM batteries.
• 6V STD: up to 7.3 V and 2 A, for small 6V lead-acid batteries.
• Maintain: up to 14.4 V and 1 A, to keep a 12V battery topped up during periods of inactivity.
• Recond: up to 16.5 V and 1.5 A, for deeply discharged 12V batteries. Not all batteries can be recovered.

Special functions (FUNCTION button)

• RE-BMS: restarts 12V LiFePO4 batteries with a BMS. If the voltage rises above 12V, the charger switches to 12V LFP mode automatically after 5 minutes.
• Voltage test (V-TEST): measures the battery voltage. It is a good idea to test the vehicle battery first to confirm it is in good condition before charging.
• SUPPLY: works as a 12V power supply with a maximum output of 6 A.

Automatic winter mode

When the ambient temperature drops below 5 °C, winter mode switches on by itself in the 12V STD, 12V LFP, 12V AGM and 6V STD programs, with nothing for you to set. It is handy if you store your motorcycle or car through the cold months. Remember: never charge a frozen battery.

Battery charger for motorcycle and car

It is a versatile motorcycle battery charger and car battery charger: it suits 12V starter batteries in cars and motorcycles, whether lead-acid, AGM, GEL, EFB or LiFePO4 lithium. With a maximum current of 6 A on 12V, it recharges and maintains batteries faster; for large-capacity batteries, bear in mind that charging will take longer.

Lithium battery charger: 12V LiFePO4 only

The LFP mode is designed only for 12V LiFePO4 lithium batteries. The manufacturer forbids charging any other type of lithium battery with this unit.

6V battery charger

With the 6V STD program you can charge small 6V lead-acid batteries. Always use 6V STD mode with these batteries: the other modes are not valid for 6V batteries.

Hook and powerful magnet

The charger includes a hook for hanging it and a powerful magnet on the back for fixing it to a metal surface, so you can leave it conveniently in the workshop or garage while it charges.

Safety and protections

• Short-circuit protection.
• Overload protection.
• Overheating protection.
• Reverse-polarity protection (the display shows "Err").
• Over-charging protection.
• IP65 waterproof rating and protection class II.
• LCD display with voltage, current, a charge level indicator (20%, 40%, 60%, 80% and 100%) and a "FUL" message when charging is complete.

How to use the battery charger

1. Check that the battery is 6V or 12V and clean the terminals. Work in a well-ventilated area.
2. With the charger unplugged, connect the red clamp (positive) to the battery's positive terminal.
3. If the battery is still in the vehicle, connect the black clamp (negative) to the chassis, away from the battery and the fuel line. If you have removed the battery, connect it to the negative terminal.
4. Plug the charger into the mains (220-240 V) and select the mode with the MODE button.
5. When finished, unplug the charger and remove the negative clamp first, then the positive one.

How long does it take to charge?

The approximate time is the battery capacity divided by the charging current: hours = Ah ÷ A. For example, a 42 Ah battery charged at 6 A would take about 7 hours from flat. A partially charged battery needs less time.

Technical specifications

Frequently asked questions

Can it charge lithium batteries?

Yes, but only 12V LiFePO4 lithium batteries, in LFP mode. It must not be used with other types of lithium battery.

Does it work with 6V batteries?

Yes, with small 6V lead-acid batteries using the 6V STD program. Do not use any other mode on 6V batteries.

Is it a charger or a battery maintainer?

Both. It recharges flat batteries and can hold them at their level with the Maintain program.

What is the RE-BMS function for?

It restarts 12V LiFePO4 batteries with a BMS. If the voltage rises above 12V, the charger switches to 12V LFP mode on its own after 5 minutes.

Does winter mode switch on by itself?

Yes. Below 5 °C it activates automatically in the 12V STD, 12V LFP, 12V AGM and 6V STD programs.

What does "bAd" mean on the display?

It indicates a faulty battery. The manufacturer recommends replacing it. The same applies to a lead-acid battery that has stayed below 3 V for a long time and cannot be brought back up by the charger.

Can I use it as a power supply?

Yes, the SUPPLY function works as a 12V power supply with a maximum output of 6 A.