Drop in lithium deep cycle replacement leisure batteries

Leaders in Lithium-ion Phosphate motor home & marine leisure batteries

12V Lithium-ion Phosphate Leisure Battery Technology


LiFePo cell chemistry is the perfect balance between size, weight, electrical capacity and life span. Various formats exist such as prismatic and pouch but for physical and electrical robustness not to mention longevity of life, we employ only the best matched cylindrical cells in our batteries. Superior to lead based chemistry, our batteries return almost all stored energy at a constant voltage, making them the perfect choice for leisure use. Particularly when reliable off grid energy is desired to power hungry devices such as television, inverters and even microwave ovens. We use a range of far eastern component manufacturers for our OEM products. In order to achieve the highest quality, this also includes specifying, designing and in some cases manufacturing our products in house. We also supply a range of very high efficiency mains chargers which will achieve a 100% charge.

Since charging lithium at low temperatures cause irreversible damage. Known as our "Super Series" we have now designed a range of batteries which incorporate low temperature charge protection as standard. 

In addition, for very harsh environments, we have designed a range know as our "Arctic Series" which feature integral heating elements, allowing normal charge and discharge operation down to -35C.

Our batteries all feature M8 terminals connection poles and are supplied with extra depth bolts and spring and flat washers. Each battery is also supplied with a detachable carry strap and a integral voltage/temperature gauge. All batteries are manufactured with a integral advanced battery management system.

KS-KT100 Batt Instruction Guide.pdf


 Unlike Lithium polymer batteries (LiPo), used in mobile phones and electric vehicles, LiFePo4 have a wider charge/ discharge tolerance. Under severe stress conditions including cell short circuit, the electrolyte reaction creates lower exothermic heat output. This means thermal runaway is not possible. This renders fire risk almost impossible and crucially there's no explosive gases.  Our batteries are CE certified and the cells are tested to UN38.3 specification. This assures KS Energy batteries not only meet, but exceed the requirements for EMC, health, safety, and environmental standards across UK and Europe.

UN38.3 certified (Land, Sea, Aviation)


KS Energy batteries are now at a  price point where lifespan ( >5000 cycles @80% - 30% DOD 0.5C, >2500 cycles DOD 95% 1C), energy density, weight and safety trounces all conventional lead technologies. Lithium-iron phosphate (developed in 1996) is becoming the choice of battery chemistry replacing lead (Pb) acid battery formats, including GEL and AGM. LiFePo4 is roughly four times the energy density of Pb. Since the entire charge is available, it is often thought as being twice as efficient as a similar rated lead acid battery. This means that at 8Ah/Kg density, it can result in a physical weight saving of around four times which also reduces a motorhome axle weight.


  KS Energy batteries come with an industry leading guarantee. Under normal use, the usable lifespan of our leisure batteries offer a typical cycle life of 5000 cycles (80% - 30% DOD @0.15C discharge) which would be in excess of 15 years daily use.

Stability: Our batteries are constructed from type 26650 or 32700 3.2V Lithium-ion Phosphate individual cylindrical matched cells which are packaged in stainless steel tube. Between each cell group we integrate a unique cell management system. Our integrated cell management system ensures each cell always functions at its optimum, both during charge and discharge. Many inferior LiFePo4 12V batteries will be constructed from Prismatic cells, which are not as mechanically or electrically stable, particularly when used to extremes. For this reason KS Energy batteries only incorporate cylindrical cells.

Life:  These batteries are among the longest lived and safest batteries ever developed. Test data in the laboratory points to well in excess of 5000 cycles from 80 to 30% and over 3000 from 80% to 0% charge/discharge cycles. This is due to the extremely robust crystal structure of the iron phosphate, which does not break down under repeated packing and unpacking of the lithium ions during charging and discharging including fast forced charging. Shallower cycles result in numbers approaching 4000 cycles (in excess of 10 years serviceable life.

Energy Density: This technology not only has a very high energy density but delivers high power for longer. Lithium cells can supply power to near zero capacity before cell voltage significantly tails off This means they can deliver nearly 100% of their stored energy. Moreover Lithium cells are perfectly happy operating in this way. Conventional Pb batteries suffer sever degradation once around 50% of the power has been delivered and significantly shortened life spans (<30 cycles typical), even worse cell voltage tails off meaning the stored energy is never practically accessible. For this reason a 100AH rated lithium battery may often be regarded as the equivalent of a 200AH lead acid battery!

Environmental Impact: KS Energy only manufacture LiFePo4 batteries and our batteries have dramatically reduced environmental impacts. Compared to lead battery chemistry, there is no highly toxic and environmental contaminating lead. The chemical elements in our batteries simply become inert upon recycling. Moreover the useful working life span can be more than 8 times that of a lead acid battery so that the ongoing carbon foot print of manufacturing reduces like for like

Simplified Charging: In addition, since cell voltage tolerance is wider and impedance lower, LiFePo batteries can accept a higher constant current charge resulting in faster charge times and since internal discharge minute, there is no requirement for trickle charging either. All KS Energy batteries incorporate cutting edge individual cell management circuit boards with LCD (optional blue tooth) charge control indicator. We are also among a few manufacturers  who have given any consideration to low temperature charge protection, offering a range of batteries (Super Series) that automatically incorporate this safety feature.