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LiFePO4 Battery Warmers

We may be best known for our RV water system UltraHeat heating pads that we first introduced to the RV industry back in 1988, however we have been producing heat panels using our proprietary heating element for a variety of other industries worldwide, since 1975.  Back in the 1980’s, we sold a lot of battery warmers sometimes also referred to as battery heaters  that operated on mostly 120VAC, generally to the semi-tracker trucking industry, and largely up in Canada. Over the past 9 plus years we have been sought out by, and have consulted with most the major Lithium battery manufactures on both the North American and European continents, to design a low voltage solution for their cold weather concerns.  What we came up with is what we have called the “wrap” style battery warmer which is often referred to as a battery blanket. With this new style we place a heat panel with our exclusive “UltraHeat Technology” heating element on both the length sides of the battery and drive heat towards the center, allowing the cells to heat consistently and evenly throughout.  Tested and approved by the Lithium battery manufactures themselves, these are not a heat pads designed for something else and then made to work on batteries like most of what we see mentioned in the blog sites or on the web.  These are designed just for use with the new and more expensive  Lithium-ion batteries, and with their charging systems whether used as a RV or MARINE house battery, golf cart, trolling, or a SOLAR energy back up or OFF-Grid rack mounted system.  Our systems are not one size-fits-all, our pads are customized to match your battery system’s series case dimensions and operational voltage.  

Our first Lithium battery warmer designs started out as one long heat panel (we call a "clam-shell") wrapping three sides of the battery, placing a heating element on each length side of the battery.  Recent years, we have seen some dynamic changes within the industry and Li battery case dimensions, moving away from the standard automotive battery size groups.    We have subsequently improved our designs to embrace a two separate heat panel system that could better adapt to the newer battery case sizes, still attaching one panel on each of the length sides of the battery.  The panels or pads are adhered directly to the battery itself via a peel-n-stick pressure sensitive adhesive integrated into the pads themselves.  Direct contact to the case is the most efficient and stable way to transfer heat into the Lithium Cells, doing so with the minimum amount of amp draw possible.   Import for the reason that many times the system is drawing power from the battery bank itself, and it may be off-grid. The panels are then controlled by a separate electronic ambient temperature sensor triggering device operating on 12VDC, preprogrammed to power 'ON' the panels with an ambient temperature fall to 35°F (1.7°C) and de-activate upon a rise to 45°F (7.2°C). We had this sensor designed for us over 15 years ago, and it has since become the 'Standard of Use' in many other industries as well. The sensor would be mounted in the storage container or compartment, in and around the batteries since that is what we trying to protect.


If you have more batteries thus warming pads then what the sensor can handle by itself, we would then have the same sensor control a 12 VDC coil relay with the heat panel’s load circuit powering through the relay’s higher amp rated contacts.   Our Lithium warming systems have been mostly sold to the OEM and Fleet level markets for many years now, where they have been tested, refined and confirmed a very successful working system for Lithium Batteries in cold weather conditions.  Only in the recent couple of years have we started to offer these same systems to the retail single user market.

We currently produce UltraHeat battery heaters for not only 12V systems, 24V, 36V, 52V and 120V system battery warmers are also available. For the higher voltage systems, we use a small step-down voltage converter to power the electronic ambient sensor and relay coil.  If you have a larger battery bank, or may have an independent BMS (Battery Manage System) at is capable of monitoring battery core temperatures, it may also have an external triggering control output connection.  If so, your BMS could control a relay and the heat panels itself (please review your BMS documentation).  For all of our Lithium battery heating panels, we extend a “Limited Life of the Battery Warranty” since they are attached directly to the battery itself, their design allows them to function reliably for decades. Our heat panels as well as the ambient temperature sensor are all produced here in the USA, supporting the U.S. supply chains and workers.

We feel that the retail market is just starting to develop beyond the original equipment manufacturers we have been selling tens of thousands to annually. Currently, we don't have our Li Warmers for sale online, mostly due to fact that battery case sizes have been changing so fast, it's been a little difficult to standardize down to a few working sizes that we can list and offer without being too confusing. And if you have done any web searches for RV tank heaters, there are a lot of them out there, which brings up another concern.  All of these other Brands are substandard overseas knock-offs of our premier UltraHeat products we have been producing since 1988, the knockoffs starting to appear around 20 years later after we launched our first online site with a lot of information.  During that time span, through our efforts, our products changed the RV Industry itself by allowing an RV’er to now use their unit in cold weather instead of "Run for the Sun" or putting up for storage. Our products became one of the most popular options in the RV Industry, worldwide.  They were even recognized back around 2007 by the ‘RV Hall of Fame’ as an Industry Changing Product. Where we have lead the way, others just follow on our shirt tail.   

This is a link to one of the domestic battery manufactures that put together more info on one of our panels they have been using.  Some good information there as well.   (note: they do talk about placing the sensor under the heat panel, this must not be done.  We don’t know why this is what they came up with, but it’s incorrect and will not work.)

Also a YouTube video from an end-user customer, Gimpy Camper.   He did a very good job in documenting his installation and setup.

We have received many testimonies and feedback about our Li Battery warmers,  in an Email received from John Green of Colorado Springs, CO on June 06, 2023, he basically sums up all of them:

"Just wanted to tell you that your battery heaters that I purchased to protect my 5 Victron 12.4, 200Ah batteries worked PERFECT this winter. We had days in the -2 deg and they held the batteries in the 50-60 degree range. Never went into charging lock out.

 Very easy to install, and wire. Would recommend to anyone! Thanks for your help. Inexpensive solution to protect very expensive batteries."

If this is something that you would like to pursue further, or you would like to get a quote for your system, please contact us directly using any of the following methods:

  • Phone - call M-F 8:30-4:30 Eastern Time Zone (574.522.6594)

  • Email (contact us)

  • Text popup on this site.


Please give us the Brand, Model and how many batteries you are using, along with the email address you would like to receive information and a quote at, along with a contact phone number.   We'll get back to you with what we would recommend for use with your system, a quote and even a basic easy to understand wiring diagram.  We'll also make it very easy to order and purchase our affordable systems.

Now Celebrating 36+ Years Since Our Introduction to the RV World!

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