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OptiMate 6 Smart Battery Charger - AC to DC - 12V/24V - 6 Amp/3 Amp
Special Price on Select TecMate Battery Chargers.

OptiMate 6 Smart Battery Charger - AC to DC - 12V/24V - 6 Amp/3 Amp

Item # MA84JR
Our Price: $131.95
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Battery Charger
Shipping Weight: 3 lbs
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Compact smart charger draws power from a wall outlet to charge, test, and maintain batteries. Great for cars, trucks, SUVs, motorcycles, tractors, light aircraft, and boats. Saves sulfated batteries as low as 0.5V. Charges 12V lead-acid batteries. 1-800-940-8924 to order OptiMate battery charger part number MA84JR or order online at Free expert support on all OptiMate products. Great prices and Fastest Shipping for OptiMate 6 Smart Battery Charger - AC to DC - 12V/24V - 6 Amp/3 Amp. Battery Charger reviews from real customers.
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  • Reviews (3)
  • Q & A (0)
  • Videos (1)
  • Photos

OptiMate Battery Charger - MA84JR

  • Boat
  • Car/Truck/SUV
  • Motorcycle
  • RV/Camper
  • 12V
  • 24V
  • Battery Charger
  • OptiMate
  • Wall Outlet to Vehicle Battery
  • Charges/Maintains
  • AC to DC
  • Smart Charge

Compact smart charger draws power from a wall outlet to charge, test, and maintain batteries. Great for cars, trucks, SUVs, motorcycles, tractors, light aircraft, and boats. Saves sulfated batteries as low as 0.5V. Charges 12V lead-acid batteries.


  • AC-to-DC smart charger quickly charges and maintains a battery
    • Perfect for charging a car, truck, SUV, motorcycle, tractor, RV, light aircraft, or boat
  • Multiple battery profiles let you charge a variety of lead-acid battery types
    • Ideal for 12V and 24V deep cycle and starter batteries
  • 8-Step charging algorithm charges and maintains without overcharging
    • Analyzes battery condition to provide a customized charge
    • Built-in battery desulfator restores lost battery capacity
    • Tests automatically and indicates if there is a battery problem
  • Ampmatic charge determines your battery size and adjusts the charging current to suit your battery
  • Temperature compensation adjusts voltage higher when colder and lowers voltage when hotter
  • Battery clamps provide a quick, easy way to connect to your battery
  • Eyelets let you make a secure connection to your battery terminals
    • 15-amp fuse protects electronics from potential short circuits
    • Zip tie slits allow easy fastening to vehicle
    • SAE connector with weatherproof seal and cap keeps out dirt and water
  • Simple operation with LED lights that indicate charging status
    • Auto-memory feature remembers the last selection if power is lost
  • Durable, weatherproof case includes wall mounts, 6' AC supply lead, and 6' charge lead with SAE connector


  • Application:
    • 12V batteries from 6 to 240 amp-hours
    • 24V batteries from 3 to 120 amp-hours
  • Battery types supported: flooded, AGM, gel, Ca-Ca (lead calcium), and deep cycle
  • Maximum charging amperage:
    • 12V at 6 amps
    • 24V at 3 amps
  • Cable lengths:
    • Battery clamps: 20"
    • Eyelets: 20"
    • AC power: 6'
    • Charging cable: 6'
  • Input voltage: 100 - 240 VAC (50 - 60 Hz)
  • Low voltage detection rating: 0.5 volt
  • IP rating: IP54
  • Lowest operating temperature: -40 F (-40 C)
  • 3-Year limited warranty

TM381 OptiMate 6 12V/24V 8-Step 12V 6A / 24V 3A Sealed Battery Saving Charger and Maintainer

Replaces TM-381

Installation Details MA84JR Installation instructions

Video of OptiMate 6 Smart Battery Charger - AC to DC - 12V/24V - 6 Amp/3 Amp

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for OptiMate 6 Smart Battery Charger with Temperature Compensation Review

Hi everyone. It's Evangeline here at etrailer. And today we'll be taking a look at our OptiMate Charger. This is gonna be your OptiMate 6 Smart Charger for your 12 and your 24 volt batteries. So this is gonna help out with some different battery needs. So you have your automatic battery charger, you have your tester, you have your maintainer for your 12 volt and 24 volt led acid batteries.

So, in this video, I'm gonna guide you through the process of how to use this charger to help out with your battery needs. It's very simple. It seems complicated at first, but that's what this video's for. So what we're gonna do is we're gonna install this and connect it to our battery. So the first thing I like to do is disconnect our battery.

If you have a disconnect switch in your trailer, go ahead and press that. In our case, we can't access it, so I'm gonna disconnect it manually. So starting with our negative terminal, I'm just gonna disconnect this. With this now off, there we go. Make sure that it's secured, and then you're gonna take off your positive terminal as well.

From here, you can either connect your clamps or you can connect your ring terminals, but you have to disconnect your battery. Step number one, plug this in. So, if you have your good trailer, you have your big truck. Usually you're outside of your garage, just from an extension cord from your garage to your charger. So now our charger's on, this is when you select your setting.

So whether you have a 12 volt battery or a 24 volt battery, that's when you go through your different settings and select, we have a 12 volt, so that's where we are. To further explain, as you cycle through the different options, you have different voltages. So make sure to select the correct voltage for your battery. Follow the instructions with that's given with optimal to figure out what your battery has. Once you've made your selection and you've saved it, you can now proceed to charge. So you have two different options here. You can either charge using your ring terminals or you can use the clamps. I highly recommend using the ring terminals, especially when you wanna use this over a long period of time. And you wanna make sure it doesn't disconnect accidentally from your battery. This is good for if it's hard to read or hard to get access to, so just make sure you choose which one fits your own situation. Notice our plug here, though, on the side of our OptiMate charger, we have this plug and then it goes either into our clamps or our ring terminals. I really like the dust cover we have over here because it's not only a dust cover, it's also a sleeve. Once you have them plugged in, you can then see how it covers all of your connection here and then protects that, which is helpful. Especially if you have this outside. What our ring terminals have that our clamps do not, is the safety fuse. So this is helpful, especially if you have this on your battery for a longer period of time, you wanna make sure you have all those protections. That's gonna be step number two. So step number two is all about the different protections and the safety protocols that come in handy when you have your battery connected. So, if you have your voltages incorrect, it's gonna have a warning sign. If you have a reverse polarity, there's gonna be warnings there too. So again, check your instructions, so you gonna have those different lights light up, depending on what type of error there's gonna be. So once you do connect it, if none of the errors pop up, it's gonna prepare to charge. So there's gonna be a one to two second delay where it determines what charge it needs to do. Step number four happens if your battery's diagnosis' having less than 50% charge or if your battery is sulfated, it will go into save mode. So save mode is where it tries to save the battery, tries to charge it up, helps out with that sulfated battery. That's not our case right over here, so we're gonna look at a next step. When I first plug it in, it entered into step number five, which is charge, that's when your battery reaches at least 50% charge or it's been helped from step number four. This goes from your 50 to 75% of charge. And then after that, it optimizes, so that's step number six. That's where we are right now. So right now in optimize, is equalizing our individual cell. It's optimizing our charge level. Note that when you go through step four, five and six, we do have a safety limit of 72 hours. So, usually you should be able to hit optimal charge within 72 hours. But if not, that might still be a thing. Just reconnect later. Once you reach full charge, it's now going to step seven, which is your test after your charge. So what this says is it interrupts your charging every 30 minutes, just to allow the program to see if your battery is retaining charge. If your green light is on, you're good to go. And finally, step number eight, that's gonna be the OptiMate or your smart maintain, which is really the whole point of this battery charger. This is what's maintaining your battery, it helps prevent sulfation of your battery as well. You see how it's green here. If your battery drops down to below 90%, that green light is gonna turn off and lets you know as well that your battery isn't at full charge and may need some help. So hopefully this helped you out with using your OptiMate Charger. Again, if you're confused about different lights, if you're not sure what the different error codes are, that's gonna be what your instructions are for. But hopefully this video helped you out as a visual guide through the whole process. It's very simple, very easy, just connect and you're ready to charge. And that was a look right here at our OptiMate 6 Smart Charger for your 12 volt and 24 volt batteries, right here at etrailer. My name's Evangeline and I hope you enjoy the journey..

Customer Reviews

OptiMate 6 Smart Battery Charger - AC to DC - 12V/24V - 6 Amp/3 Amp - MA84JR

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

Compact smart charger draws power from a wall outlet to charge, test, and maintain batteries. Great for cars, trucks, SUVs, motorcycles, tractors, light aircraft, and boats. Saves sulfated batteries as low as 0.5V. Charges 12V lead-acid batteries.


Working like a charm! Charging and maintaining two batteries on a F-350 7.3 L. Fits under the hood nicely allowing it to close and lock. Compact, portable and the extra length of cord is very nice to have. Quality product, quality customer service!




See what our Experts say about this OptiMate Battery Charger

  • What Size Battery Should I Use With My Badland Winch 2500
    The amount of cold cranking amps you need depends on how much you plan to lift/pull. The Badland Winch 2500 has an amp draw of 132amps at 2500 lbs, so any car battery should do. I would recommend including a charger in your setup. I recommend the OptiMate 6 Smart Battery Charger w/ Temperature Compensation - AC to DC - 12V/24V - 6 Amp/3 Amp part # MA84JR. This charger is designed to plug into a wall outlet. It is also a smart charger, so it will adjust and maintain the charges according...
    view full answer...
  • Will NOCO Genius Smart Battery Charger Work with 24 Volt Batteries
    The NOCO Genius Smart Battery Charger part # 329-GENIUS2 is not rated for use with 24 volt batteries. In order to charge both 12 volt and 24 volt batteries you would need a different charger like the OptiMate 6 Smart Battery Charger part # MA84JR.
    view full answer...

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Info for this part was:

Employee Jacob T
Video Edited:
Jacob T
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Edited by:
Daron K
Employee Alex H
Written by:
Alex H
Employee John S
Video by:
John S
Employee Evangeline M
Installed by:
Evangeline M

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