Drop in lithium deep cycle replacement leisure batteries

Leaders in Lithium-iron Phosphate motorhome, caravan & marine leisure batteries

Special Series

We have a growing range of bespoke lithium batteries that include a Ducato/Boxer/Relay driver/passenger under seat base battery which provides maximum energy storage within this confined space. We also have a low profile lithium battery with a height profile of 190mm suitable for restricted battery compartments, for example the batteries fitted in many European brands such as  Hymer, Rapido and Carthago.


Model KS-SB200B Seat Base 200Ah 12V lithium leisure battery with integral Low temperature charge protection and Bluetooth

The KS-SB200B is a high performance 200AH deep cycle lithium battery that has been designed specifically to under the seat base area of the Sevel X250/X290 based chassis. ie. the front seats of the Fiat Ducato, Peugeot Boxer or Citroen Relay chassis base that is favoured by many British and European motorhome / campervan manufacturers.

Main Features Compact seat base footprint with integral floor fixing brackets (removable), automatic low temperature charge protection, Bluetooth monitoring via the KS Energy free app. Over charge voltage, over current cut out and under voltage cut out makes this battery virtually abuse proof. It may be configured for unlimited parallel configuration and its 330*270*180mm compact size can also make it ideal for other space limited locations.

Specifications KS-SB200B
Product code: 5060716640216, Type: Lithium-Iron Phosphate (LiFePo4)
Battery voltage nominal: 12.8V, charged at rested: 13.2V
Nominal capacity: 200AH, 2.56KWh @ 25oC
Cells: 2670 cylindrical 3.2V 4000mAh, arrangement: 4S*50P
Maximum continuous discharge current: 150A
Peak surge discharge current: 300A for 15 seconds
Size: L*W*H 330*270*180 (inch 13*10.6*7.1), excludes removable brackets
Removable fixing bracket: length 18mm each (inch 0.7)
Weight: 24Kg (52.9lbs)
Max charge voltage: 14.6V
Max continuous charge current: 150A
Recommended charge current <100A
Recommended Charge voltage 14.4V, Charge type: CC/CV
Recommended discharge current: <150A
Recommended low voltage disconnect 11V
Float voltage (when applicable) 13.3V - 13.6V
Operating temperature: -20°C to +50°C, Storage temperature: -20°C to +30°C
Parallel configuration: unlimited, Series: 4 max

Battery Management/Protection: Internal BMS actively balanced
Low temperature Charge Protection: charge current disconnect <0°C
Battery Over Charge Protection: disconnect 14.8V, resume 14.4V
Cell over charge protection: cell bank disconnect >3.75V, resume <3.55V
Battery Over Discharge Protection: discharge disconnects <10.6V, release 11V Short Circuit electronic trip: >450A, release <400A
Over temperature shut down: >60°C, release <55°C
Efficiency: 99%, internal resistance ±3%: 25mΩ @ 50% SOC 25°C
Self-discharge: 3%/month, max. dry storage (@60% capacity): 12 months Terminal connections: M6 bolts for M6 sized lugs recommended torque 5Nm
Case material: Powder coated steel, ingress rating: IP52
Parallel configuration: unlimited, Series: maximum 4
Life Span >5000 cycles @80%-30% DOD @0.5C, >2500 cycles DOD 95% @1C
Wireless protocol: BLE-Bluetooth® 4.0 with auto-hibernate
Compliance: UKCA (CE) Certification for the entire battery (product)
ROHS Certification for the entire battery (product)
UN38.3 Certification for the entire battery (product)
Shipping designation Class 9
Designed in Great Britain, country of assembly China

Physical KS-SB200B.pdf
KS-SB200B Batt Instruction Guide.pdf

Model KS-LP120B 12V 120AH low profile lithium leisure battery  with a smart Bluetooth high current BMS and low temperature charge protection.

A high performance deep cycle lithium battery  in a low profile 190mm tall case featuring standard automotive battery base (B3 hold downs), T1 pole terminals and integral carry handle. This leisure battery has a high current (150A continuous power draw) BMS with automatic low temperature charge protection, Bluetooth monitoring via our free KS Energy app. Over voltage & current cut out and under voltage cut out makes this battery virtually abuse proof and it may be configured with unlimited parallel configuration or a series of 2 or 4 in a row to achieve a 24V or 48V bank.

Specifications- KS-LP120B
Product code: 5060716640223, Type: Lithium-Iron Phosphate (LiFePo4) Battery voltage nominal: 12.8V, charged at rested: 13.2V
Nominal capacity: 120AH, 1.54KWh @ 25oC
Cells: 2670 cylindrical 3.2V 4000mAh, arrangement: 4S*30P
Maximum continuous discharge current: 150A
Peak surge discharge current: 300A for 15 seconds
Size: L*W*H 340*170*190, (L=353mm including B3 battery base lugs)
Weight: 13.6Kg (30lbs)
Max continuous charge current: 150A
Max charge voltage: 14.6V
Recommended charge current <100A
Recommended Charge voltage 14.4V, Charge type: CC/CV
Recommended discharge current: <150A
Recommended low voltage disconnect 11V
Float voltage (when applicable) 13.3V - 13.6V
Operating temperature: -20°C to +50°C, Storage temperature: -20°C to +30°C
Parallel configuration: unlimited, Series: 4 max
Battery Management/Protection: Internal BMS actively balanced
Low temperature Charge Protection: charge current disconnect <0°C
Battery Over Charge Protection: disconnect 14.8V, resume 14.4V
Cell over charge protection: cell bank disconnect >3.75V, resume <3.55V
Battery Over Discharge Protection: discharge disconnects <10.6V, release 11V Short Circuit electronic trip: >450A, release <400A
Over temperature shut down: >60°C, release <55°C
Efficiency: 99%, internal resistance ±3%: 25mΩ @ 50% SOC 25°C
Self-discharge: 3%/month, max. dry storage (@60% capacity): 12 months Terminals: T1 industry standard sized brass poles
Case material: ABS Ingress Rating: IP52
Life Span: >5000 cycles @80%-30% DOD @0.5C, >2500 cycles DOD 95% @1C
Wireless protocol: BLE-Bluetooth® 4.0 with auto-hibernate
Compliance: UKCA (CE) Certification for the entire battery (product)
ROHS Certification for the entire battery (product)
UN38.3 Certification for the entire battery (product)
Shipping designation Class 9
Designed in Great Britain and assembled in China

Model KS-ARC120 ARCTIC SERIES ultra low temperature 120AH 12V lithium leisure battery

The KS-ARC120 Arctic LiFEPO 12V 120AH is a ultra low temperature high current leisure/equipment battery featuring an advanced internal cell construction using a unique bolt/cradle fixing system. Each bank is encased in an electrically self-heating silicon rubber blanket which is controlled by the smart battery management system. Both normal charging ability and discharge is possible from minus 30 degrees Celsius.


Automatic monitoring of the central temperature for each cell bank enables the smart BMS to maintain a safe operational temperature, regardless of the real time external ambient temperatures. The battery continue to charge or discharge normally upon demand. The system if fully autonomous with no required user intervention or any additional wiring. When charging, additional power is taken from the charger (via the battery poles) to provide heat. The battery may be externally lagged to improve the efficiency making additional power available for charging from any standard 14.4/14.6 cc/cv charger.

Specifications: Battery Type: Lithium-ion Phosphate (LiFePo4) 3270 cylindrical type 3.2V 6000mAh; Cell combination: 4S *20P; Cell management (BMS): High power internal controlled intelligent multi cell balanced system with automatic temperature cell management system; BMS integral protection: Low temperature cell heating: (charge current diverted to internal heating elements <0C); Short Circuit electronic trip: (>320A 250µS); Over voltage: detect 15V <2S, release 14.2V; Over discharge voltage: 8.8V <2S, release 10.8V; Over temperature shut down: 70oC; Battery voltage nominal: 12.8V, At rest: 13.3V; Capacity: 120AH nominal, 1.54KWh @ 20oC ; Size: (mm ±2) L*W*H 330*170*215 (inch 12.9*6.7*8.5) Weight: 15.7KG (33 lbs); Depth Discharge: 100% Efficiency: 98%; Internal resistance ( ±3%) : 28.5mΩ, Self-discharge: 2.5% per month; Maximum recommended dry storage duration: (@55% capacity): 12 months; Max continuous discharge current: 160A Peak surge discharge current: 250A for 30 second; Max continuous charge current: 120A, Charge voltage: 14.4 to 14.6V, Charge type: CC/CV; Operating temperature range: -30oC to +60oC; Terminals: F12 (M8), Case material: ABS, Ingress Rating: 64; Parallel configuration: 4 (ensure suitable fuse protection), Series: 4 batteries maximum; Life Span: >5000 cycles @80% - 30% DOD @ 0.5C, >2500 cycles DOD 95% @ 1C; Designed in Great Britain by KS Energy Holdings (UK) Limited, manufactured in China.