CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V
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Availability:
In Stock.
Arrives
Sunday, Oct 11
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Size: MXS 5.0
Features
- Battery Charger: MXS 5.0 is a fully automatic 8-step battery maintainer that provides an outstanding charging experience for 12-volt lead acid and AGM batteries , Ideal for car and bike owners.
- Improved Charging: MXS 5.0 is designed to optimally charge in all conditions. Whether it's marine, car, bike, RV or tractor it's the perfect companion - especially for cold weather drivers!
- Maximize Lifetime and Capacity: The 4.3 amp battery charger's reconditioning function can improve the lifespan of healthy batteries*, and bring some underperforming batteries back to life.
- Splash and Dustproof: MXS 5.0 battery charger is splash, dust, spark and shock proof, making it a reliable and safe option with a short-circuit-proof design that prevents reverse polarity
- Set and Forget: CTEKs patented float/pulse charging allows set and forget for months at a time without harming the battery. No need to disconnect the battery during use its simply plug and play.
Description
Maximizing Battery Performance isn’t just a slogan – it’s right at the heart of everything we do and every product we make. It means we push the boundaries of research and development to bring new battery charging technologies to the market. And we’re ahead of the competition because we constantly improve and constantly innovate. Where others have diversified, we remain focused on maximizing battery performance. CTEK BUMPER (56-915) CTEK CIG PLUG (56-263) CTEK INDICATOR EYELET (56-382) BUMPER (56-915) The CTEK Bumper is a silicon rubber case to protect the CTEK charger & Vehicle. CIG PLUG (56-263) CTEK Cig-Plug enables charging the battery through a cigarette lighter outlet. INDICATOR EYELET (56-382) CTEK Indicator is designed for permanent installation connected to the battery. 56-915 CTEK Bumper 56-263 CTEK Cig-Plug 56-382 CTEK Indicator Eyelet
Brand: CTEK
Color: Multicolor
Product Dimensions: 5.91"D x 11.02"W x 2.36"H
Item Weight: 1.3 pounds
Output Voltage: 12 volts
Output Voltage: 12 volts
Input Voltage: 120 volts
Battery Charge Time: 50 hours
Current Rating: 4.3 A
Amperage: 4.3 A
Compatible Devices: 12-volt lead acid and AGM batteries
Connector Type Used on Cable: Alligator Clamps
Number of Ports: 1
Item Dimensions D x W x H: 5.91"D x 11.02"W x 2.36"H
Item Weight: 1.3 pounds
Specification Met: IP65
Color: Multicolor
Brand: CTEK
Mfr Part Number: 40-206
Global Trade Identification Number: 67
Number of Items: 1
Manufacturer: CTEK
Unit Count: 1 Count
Built-In Media: MXS 5.0 BATTERY CHARGER
Item Type Name: MXS 5.0 BATTERY CHARGER
Model Number: 40-206
Warranty Description: LIMITED WARRANTY
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Oct 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: MXS 5.0
I have two of these chargers. One that I have been using for 4 years and the other for 1 year. They work great and are in almost constant use for keeping a tractor, a mower and a motorcycle charged and the batteries maintained. They are not cheap but I believe that they are worth the price given how well they work, how long they last, and how they extend battery life.
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Reviewed in the United States on January 25, 2026 by ATCZERO
Size: MXS 5.0
Jay Leno talked about this unit on his show and praised it highly, he's a real car guy plus I highly doubt Jay's endorsement could be bought. I plugged mine onto what had been a healthy 12V car battery that tested at only 11.6 volts when resting. Overnight, the charger went through all 8 steps of charge/test and had a green light. Now the battery tests at 12.6v Maybe any other charger would have restored it that well but this thing puts the battery through a lot of steps to improve and insure it's 'health'. Highly recommend. High quality, fast charge, great power, easy to attach, LONG cord, easy to use basically plug'n'play. The instruction manual however, not so great. I viewed some youtubes to make sure I understood the various functions, there are plenty of them, turns out this is a very popular charger for real car guys.
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Reviewed in the United States on October 30, 2025 by TDW
Size: MXS 5.0
This battery charger/maintainer works excellently with almost no effort to recharge a weak battery or maintain a battery in cars that aren't driven regularly. This is especially important in colder weather as the charge can drop enough to be unable to start the vehicle. This almost happened to my 2011 BMW 535i Xdrive 95Ah battery after not moving it for 2 weeks mid winter. I got several low charge warnings but thought they would go away once I drove a bit, but trips were far and few between. The charger power cord is hard wired, and the output leads have a fast clip connector at the far end to plug in either the alligator clip ends or 1/4" eyelets for a more permanent connection to make frequent charging easier. Both the power cord and the output leads are 6' long for a total of 12' plus another 18 inches for either the alligator clip or eyelet connectors, so there's plenty of length to position the charger where you want. The clips are spark free and have polarity protection so you don't have to worry about those when making your connection. Plugging the device in starts it in standard vehicle battery mode. Other modes include motorcycle for smaller vehicles, AGM for those batteries, and a reconditioning mode to restore full capacity to batteries that have lost some charge capability. From almost dead, it took about 28 hours to go through all 7 phases of charge. Patience is the way to go here, don't check often, especially if you have to open a door or hood to do so. I found it best to leave it under the hood with it slightly ajar and check every 4 hours or so. Resist the urge to unplug it because you think it's not progressing. It is. Even in cold weather it will get your battery back in great condition with little more than the press of one button. Highly recommended.
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Reviewed in the United States on January 26, 2025 by JetsetterJason
Size: MXS 5.0
Ideal battery tender for a Prius, the unit comes with the right size connecter for direct connection, once installed, just plug in the cable to the charger. Simple to use no more dead starting battery.
Reviewed in the United States on March 12, 2026 by CS
Size: MXS 5.0
3rd Update: My CTEK has now gone to Step 8. I can hear a faint, ticking type of sound coming from it, like I heard in some earlier steps. So,...it works exactly like it's supposed to.🥹 I love it!🥹 2d Update: My CTEK is still keeping my battery charged, at Step 7. I keep the hood open just a bit, and occasionally lift it to check on everything, as I am using the clamps to connect my CTEK. I also check my CTEK daily. I have it sitting on a table near my outlet and my vehicle. I did purchase the additional extension cord from CTEK, but haven't needed it. The only cord that seemed a little short to me was the cord that the clamps are connected to, but it turned out to be plenty long to reach my negative ground point bolt, and to connect to the Comfort Connect cord that goes to my CTEK. CTEK has a video out showing how you can make the clamps cord a little longer, but I think its best to wait and see if you need to do that, because once you pull it apart, you can't really undo what you've done. It was a little awkward for me connecting everything by myself the first time, and I didn't want to drop anything - especially inside my engine compartment - so, I put everything, but the clamps cord in a tote bag and sat it in a secure spot under the hood while I very carefully connected the clamps. I think the first time I did this, I even kept my arm inside the totebag handles. Laugh all you want, but better than fishing it all out of my engine compartment.🥹 Update from Earlier Review Today: It is early afternoon, and my Ctek has now reached Step 7, and is showing a green light at that step!😊 No more dead batteries for me!😊 Original Review: I think this is a fantastic device, and I am so happy I found out about it!😊 I had no idea there was something out there like this. It is now charging my vehicle at Step 4, and I am confident it will continue thru all the steps. When I first hooked it up, my vehicle battery was down to 3.6. I found this out when I jumped it with a jump box, something which I knew nothing about either. I started out looking for jumper cables.😊 So, this device would not go past Step 1. The solid red error light came on, and the green light stayed on. I unplugged it, and reconnected the cables to my battery, and plugged it back into the wall outlet. (I thought maybe one of the cables had moved when I gently lowered my vehicle's hood, and left it open just a little bit. But, that was not the case.) The red light did not come back on, but the green light did, and it did not go back to Step 1. Since the green light came back on, I figured my Ctek was good, and that my battery was just too low for it to charge. So, I jumped my vehicle, (and it immediately came to life, as it is a newer one) and drove it for awhile. I then reconnected my Ctek - after resetting my BMS (Battery Management System), and locking all my vehicle doors, per my vehicle manual - and it immediately went to Step 2, with the green light on. Sometime overnight, it went all the way to Step 4, and I am so very happy!😊 Thank you so much, Ctek!😊
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Reviewed in the United States on November 20, 2025 by Marigold
Size: MXS 5.0
Performs exactly as it should, UI is clean and intuitive. Solidly made, power cord is heavy duty. Costs 40% more than NOCO 5, but comes with a 5 year warranty (versus NOCO 3 year). Only 1 negative - the clamp cable wires are too short, for long, classic european 95ah AGM batteries (like classic Ferrari, Mercedes or BMW) without charge system management connectors (so you attach directly to battery terminals), they can barely stretch across to both terminals. Had to use the (included) eyelet permanent connector cable. But that solved it. That’s the only reason for not giving a 5 star review.
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Reviewed in the United States on December 4, 2025 by Aren.