Skip to content
Skip to content

OptiMATE 2 DUO TM-551 BRONZE Series 5-step 12V / 12.8V 2A Sealed Battery Maintainer

SKU TM-551
by TecMate
Original price $90.86 - Original price $90.86
Original price
$90.86 - $90.86
Current price $90.86
in stock

Rise takes a thoughtful approach to assessing and choosing home improvement products and brands that prioritize homeowners' health, their wealth, and the planet.

The OptiMATE 2 DUO TM-551 is a reliable and efficient battery maintainer designed to help you save money in the long run. Its advanced charging algorithm ensures that your battery stays at the optimal charge level, preventing sulfation and other common issues that can lead to premature battery failure. With the OptiMATE 2 DUO TM-551, you can extend the life of your battery and enjoy years of trouble-free performance.

This product is suitable for a wide range of vehicles, including motorcycles, cars, and boats. Its efficient design ensures that it consumes minimal power while maintaining your battery, making it a cost-effective solution for battery maintenance. Whether you're a seasoned mechanic or a beginner, the OptiMATE 2 DUO TM-551 is easy to use and guarantees excellent res

Delivery time / Order Processing & Shipping Times

Rise ships manufacturer direct. We work hard so you receive your product(s) as quickly as possible. Shipping times are subject to each carrier's daily cut-off time, and dependent upon warehouse turnaround. Learn more about our order processing & shipping times here.

Carbon-neutral shipping with Shopify Planet
Carbon-neutral shipping on all orders
shipping emissions removed
That's like...
miles driven by an average gasoline-powered car
We fund innovations in...
Direct Air Capture
Bio Oil


IDeal ForAGM, GEL & STD 12V batteries from 6 – 96Ah & Lithium (LiFePO4) 12.8/13.2V batteries from 2 – 24Ah
Charging Amps2A (constant current)
Charging Voltsnominal: 12V & 12.8V range: 4V – 14.4V
OperationFully automatic
FeaturesAdapts automatically to Pb or LFP battery. 24-7 safe long term maintenance.
Warranty3-year limited replacement warranty.
ModelOptiMATE 2 DUO
Manufacturer Part NumberTM-551
USeIndoor / Outdoor  (lowest temperature: -40°F / -40°C).
InputGlobal (100-240V 50-60Hz), high efficiency (CEC listed).
STyleWeatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector.
SafeTyNo 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.
includedIncludes 2 battery connection cable accessories, weatherproof battery lead & battery clip set.


What battery voltage can I charge?The OptiMate 2 DUO is suited for charging 12V lead acid and 12.8V / 13.2V Lithium (LifePO4 / LFP) batteries.
What type and size batteries does OptiMate 2 DUO charge?The OptiMate 2 DUO can be used for 12V lead-acid (STD, AGM and GEL) and 12.8/13.2V lithium (LiFePO4 /LFP) batteries, used for engine start & deep cycle applications. For batteries from 6Ah to 96Ah for 24-7 battery maintenance. Can recharge batteries up to 48Ah within 24hours
Which will be the charging time?The time required for the OptiMate 2 DUO to complete a charge on a flat but otherwise undamaged battery is roughly equal to 0.5x the battery’s Ah rating, so a 42Ah battery should take no more than about 21 hours to progress to Step 4. Deep-discharged batteries may take significantly longer.
Do I need to make a selection for my type of battery?No, the adaptive program adjusts to the battery type.


Interested in Deals and New Products?

Keep up-to-date on deals and new home building products that benefit your health, your wealth, and the planet delivered right to your inbox.