SKU: 40518950278

CTEK CS FREE 12V 20A Portable Smart Battery Charger Maintainer Lead Acid Lithium

Sale price$144.87 Regular price$160.97
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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

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Description

CTEK CS FREE 12V 20A Portable Smart Battery Charger Maintainer Lead Acid LithiumJust charge up CS FREEs internal battery and keep it with you wherever you go, and itll stay fully charged for up to a year. CS FREE features our revolutionary Adaptive Boost technology to quickly get you going from a flat battery. CS FREE automatically analyses the state of your battery and adjusts to the batterys voltage level. It then works out the safest and quickest way to give your battery the power it needs to start your vehicle within 15

Just charge up CS FREE’s internal battery and keep it with you wherever you go, and it’ll stay fully charged for up to a year. CS FREE features our revolutionary Adaptive Boost technology to quickly get you going from a flat battery. CS FREE automatically analyses the state of your battery and adjusts to the battery’s voltage level. It then works out the safest and quickest way to give your battery the power it needs to start your vehicle within 15 minutes. CS FREE works anywhere and can even be powered by solar or a 12V battery for longer term maintenance charging.

The CS FREE is the world’s first fully portable battery charger and maintainer with Adaptive Boost to get your flat battery going quickly and safely – without the need for mains power. In other words, it’s a 12V power bank for your vehicle that works with both lead-acid and lithium (12V LiFePO4) batteries. Plus, it’ll keep your portable tech, like phones, laptops & cameras topped up too. So simply charge it up, take it with you and use it anywhere! 

QUICK TO GET YOU GOING

The CS FREE is a portable Adaptive Booster that will get you going from a flat battery within 15 minutes.

CHARGE IT UP!

Just charge up the CS FREE’s internal battery and you’ve got a 12V power bank that will stay fully charged until you need it – for up to a year. And with USB-C connectivity, you can fully recharge your CS FREE in just one hour!

NO POWER? NO PROBLEM!

If you have a car, a motorcycle, a boat or any other 12V vehicle and want to charge and maintain for longer periods of time…well no worries! We some optional handy accessories to enable charging via solar panel or a 12V service battery.

Specification


  • Brand: CTEK
  • Model: CS FREE
  • Battery Capacity: 10-130 Ah
  • Battery Capacity CEC-400: 10-130 Ah
  • Changing Category: AC Charging; DC Charging
  • Battery Voltage: 12V
  • Battery Chemistry: Lead Acid; Lithium-ion
  • Ambient Storage Temperature: -20 °C to +45 °C (-4 °F to +113 °F)
  • Ambient Operating Temperature: -20 ËšC to +50 ËšC (- 4 °F to +122 °F)
  • Cooling: Natural Convection
  • Frequency: 50-60 Hz
  • Input: USB-C, 5 VDC – 25 VDC, 3 ADC/60 W max
  • Output: 12 V, 20 A/240 W max
  • Battery types: 12 V:; WET; MF; Ca/Ca; AGM; EFB; GEL; LiFePOâ‚„
  • Rated voltage (Input): 100 VAC – 240 VAC
  • Degree of protection: IP54
  • Enclosure material: Plastic
  • User interface: LED symbols
  • Detachable charging cable length (output): 2m
  • Internal battery capacity: 66 Wh
  • Internal battery cell chemistry: Polymer Lithium-Ion
  • Internal battery cell type: Pouch Cell
  • Internal battery charge temperature: 0ËšC to +45ËšC (32ËšF to 113ËšF)
  • Internal battery discharge temperature: -20 ËšC to +50 ËšC (- 4 °F to +122 °F)
  • Internal battery lifespan: 300 cycles, 80%
  • Internal battery shelf life: 1 year
  • Internal battery weight: 0.5 kg
  • Mains adapter cable length: 1m
  • Mains adapter cable type: USB-C

IN THE BOX

  • 1 x CTEK CS FREE
  • User Manual is accessible online

SIZE & WEIGHT

  • Product Dimensions (W x L x H): 98 x 248 x 78mm
  • Product Weight: 1.4kg

SKU: CTEK-40-462


We accept Change of Mind returns for 14 days after you have received the item in cases where you have changed your mind or made an incorrect purchase and wish to return the product. This also applies to orders cancelled when the item has already been dispatched from our warehouse. The item must be in a re-saleable condition to qualify for a change of mind refund. Deductions may apply including Initial and Return Shipping, as well as restocking fee of 10% of the product price

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 40518950278

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4.6 ★★★★★
Based on 24 reviews
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Product Reviews
M
Verified Purchase
Michelle Rohrbach
Massapequa, US
★★★★★ 5
Great filter
Style: HCC2146-X
My husband said this filter was high-quality, he was quite impressed. We’re not crazy about the washable kind normally, so we’ll have to see how it holds up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 29, 2026
S
Verified Purchase
Sandwichmaker
Phoenix, US
★★★★★ 5
Filter Fits Properly and is an Easy Install
Style: Particulate Media
Though not made for or by Honda, this filter is inexpensive and looks like it's capable of filtering the air coming into the passenger compartment of our 2012 Honda Fit. The primary difference between this unit and the original filter supplied by Honda is that the original unit has some "ribs" that help to keep the pleats separated attached to the top of the pleats. The item I received lacks that, but it appears to me that the pleats are strong enough on their own for the intended purpose. The filter fits into the frame as it should. Replacing this filter is incredibly easy and requires no tools: you empty the glove compartment, compress it's sides inward so that the rubber stops on either side clear the dash, allowing the glove compartment to drop out an extra 4-5 inches. Then, you can see and reach the cover for the cabin air filter, which is secured by latches on each side. Remove the cover and slide out the filter and frame. Replace the air filter element, which just sits in the frame, replace the frame and cover, and compress the glove compartment sides again to put it back in place. Put your stuff back in the glove compartment and you're done. In a few minutes you've saved significant dollars over the cost of having this done in the shop. Congratulations! The engine air filter is equally easy to replace in the Fit, though for that job I prefer to use a Honda OEM part. Edit: I thought I should add a reminder to install the filter in such a way that the air flow indicator is the same as the one that you remove, i.e. do not put it in upside down. If I remember correctly, air flows from above to below in the Honda Fit. Also, currently, the price for this item is not competitive.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 21, 2014
D
Verified Purchase
Don
Port Orchard, US
★★★★★ 5
Easiest to install so far
Style: HEPA
So the 2018 Honda Odyssey apparently checks the air flow and after a certain point it determines the cabin air flow is less than desirable. At least this this is what I’ve gathered after talking to my dealer. Buying a thick filter may not be better. This was the easiest filter to install. I didn’t have to gingerly coax it In without collapsing the filter. It fit easily and I didn’t have to cut it. Pro Tip: Write the date of install in case your dealership says “well cabin air flow is blah blah blah.” Just tell them to check the date. You should get 6-12months on a filter. My dealership wanted to charge a ridiculous amount for what is literally a 2 minute job. Decent filters will cost around $20. Thicker isn’t better. It all depends on how much crap you have in your glove box. And how much crap is in your air. It might take longer to get all the receipts, first aid kits, tick prevention kits, headlights for the Scouts that forgets theirs, oh that there’s that Leatherman and Mylar blanket is… The job entails emptying the glove box, who’s keeps gloves in these? Press the tabs to drop the box and then Voila there is the filter. It’s really that easy. Ok pull the cover off and pull the old filter. Unless you live in a really dusty environment or have squirrels that are destined to ruin your life there shouldn’t be any real mess . Pull it out and put this in. There’s air flow arrows but even if you did it backwards the van isn’t going to explode in a ball of flame, fueled by the forgotten Cheerios under the seat. Relax, you did it. The world still turns and you’re good to go. Now it’s time to think about the engine air filter. You can do it. It’s easy but the clips can be a pain so it’s better to grab an adult beverage before, just in case.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 11, 2021
M
Verified Purchase
MJ
Pawtucket, US
★★★★★ 5
Great Product
Style: HEPA
This product is a fantastic find! It's reasonably priced, making it accessible for most budgets without compromising on quality. The product is exactly as described, and its usefulness cannot be overstated. I've found it to be incredibly practical and efficient in meeting my needs. The attention to detail is impressive, and the performance is on par with more expensive alternatives. If you're looking for something reliable, well-made, and at a fair price point, this is the perfect choice. Highly recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 28, 2026
J
Verified Purchase
Juan
Lowell, US
★★★★★ 4
Works as intended but lowers airflow
Style: HEPA
I got this because of the wildfire smoke in my area. It definitely filters out smell compared to a regular filter so I'm assuming it's also filtering out larger particles in the air. However, I've noticed that the airflow is reduced by a lot and the car is a lot warmer on the same setting I've used for years. It's a trade off and I might just rotate filters depending on AQI and how hot it is since it takes like a minute to change it out. I would recommend it if you live in an area that's smoky or cooler but not in places that get hot.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 13, 2023

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