OptiMate DC-DUO

MSRP $109.95

OFF-GRID series: 6-step 12V/12.8V 2A sealed DC to DC battery saving charger & maintainer

OptiMate DC-DUO 12V 2A, the ideal off-grid charger and maintainer for your 12V lead-acid or 12.8V LifePO4 / LFP Lithium battery, that draws power from another 12V battery – No AC power required!

The DC to DC battery charger is ideal for 12V lead-acid and 12.8V/13.2 lithium LFP batteries.The DC to DC battery charger is recommended for scooters, motorcycles, maritime, cars and lawn mowersIdeal for 12V lead-acid & 12.8V / 13.2V lithium LFP (LiFePO4) batteries found in the vehicles / craft above.
BMS (Battery management system) BMS re-activates battery from sleep or deep discharge protection mode.
The fully automatic multi-step program to full charge the battery safely.
Fully automatic multi-step program brings the battery safely to full charge – Connect to the battery and OptiMate DC-DUO does the rest, no supervision required!



Adapts automatically to Pb or LFP battery.
Safe to leave connected. Full electronic protection.
Maintains battery at full charge and good health.
Saves your ‘dead’ battery from as low as 2V.
Tests battery state of health.
Protects source battery from total discharge.
Energy saving technology.
Stand-by power less than 0.5W.
Efficient 24-7 battery maintenance.
Weatherproof. Rated for use down to -40°C / -40°F.



As a safety measure the OptiMate DC-DUO has battery protection built in, meaning it will not charge if the source battery has a voltage lower than 11V.
Also, if already connected to the source battery, after one minute, the OptiMate DC-DUO turns off if not connected to the battery that needs charging. To re-start, disconnect from the source battery and then once again reconnect.

Source battery capacity (in Ah) should ideally be 1.5 times higher than the battery to be charged. E.G. to recharge a flat 10Ah battery, you need a 15Ah source battery. The 12V SOURCE BATTERY should ideally be rated for deep cycle use.

You can use any type of 12V-16V lead-acid/LFP battery as the source battery.

SKU: TM-500 Category:



In store packaging


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IDEAL FOR:  STD, AGM & GEL 12V batteries from 6Ah and LiFePO4 (LFP) 12.8V/13.2V batteries from 2Ah.

CHARGING AMPS: 2A (constant current)

CHARGING VOLTS: nominal: 12V & 12.8V range: 2V - 14.4V

OPERATION:  Fully automatic


FEATURES: CHARGE YOUR 12V (Lead Acid) or 12.8V- 13.2V (LFP-Lithium) BATTERY FROM ANOTHER 12V BATTERY! NO AC POWER REQUIRED. Ideal for both lead-acid and LFP (LiFePO4) batteries.

USE: Indoor (lowest temperature: -40°F / -40°C).

INPUT : 12-16 V, 2.7A max. With source battery protection > low battery warning light and automatic shut-down.

STYLE: Weatherproof case with wall mounts, with 1ft / 30cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector.

SAVE : Low Volt Start of 2V

SAFE: Input electrically isolated from output. No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected.

INCLUDED: Fused battery clip set, standard battery clip set & weatherproof battery lead.

WARRANTY: 3-year limited replacement warranty.


How it works: As simple as 1-2-3!

Attach the fused clip set to the short input cable (side marked 12 – 16V) and then connect the OptiMate DC-DUO to a charged source battery e.g. your vehicle’s 12V battery.  The OptiMate DC-DUO's SAVE and CHARGE LEDs will blink together for 1 minute, indicating it is ready to charge a battery.

Within 1 minute* connect the output charge lead to the battery requiring charge, using the standard clip set or connect directly to the battery that may have the weatherproof battery lead already pre-wired. Charging proceeds when the SAVE or CHARGE LED turn full on.    *After 1 minute the OptiMate DC-DUO turns off if not connected to the battery that needs charging. To re-start, disconnect from the source battery and then once again reconnect.

Wait until the green TEST LED blinks. ‘First Aid’ charging has been completed! Leave the charger connected for ‘365’ long term maintenance.