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Lithium-ion battery 12.8v 42ah power tools / Portable home appliances/rechargeable battery

  Lithium-ion battery 12.8v 42ah power tools / Portable home appliances/rechargeable battery Rated Capacity: 41.1Ah, 526.08WhNominal Voltage: 12.8 VDCCycle Life: 2000 @ 0.2C (100% DOD), 3200 @ 0.2C (80% DOD), 5000+ @ 0.2C (50%...

SKU: JL12-42LIN/ACategories: Lithium batteryTags: lithium battery


Lithium-ion battery 12.8v 42ah power tools / Portable home appliances/rechargeable battery

Rated Capacity: 41.1Ah, 526.08Wh
Nominal Voltage: 12.8 VDC
Cycle Life: 2000 @ 0.2C (100% DOD), 3200 @ 0.2C (80% DOD), 5000+ @ 0.2C (50% DOD)
Dimensions: L 197 × 135 × 172mm (7.75” x 5.35” x 6.75”)
Weight: 5.5Kg (12lb)
Battery Management System: Short Circuit, Current, Voltage, Cell Balancing
Cells: IFR 32700 6Ah LiFePO4, 7P4S
Charging Method: Constant Current - Constant Voltage (CC - CV): (0.2C to 14.4Vdc) - (14.4Vdc to 0.01C)
Voltage Limits: Charge: 14.6Vdc, Discharge: 10Vdc
Current Limits: Charge: 40Adc, Discharge: 40Adc
Temperature Limits: Charge 0 ~ 45°C, Discharge -20 ~ 55°C, Storage -20 ~ 55°C
Connectivity: Series: 4 Units (48Vdc 42Ah), Parallel: Unlimited (12.8Vdc)
Terminal Connector: F2 Tabs - 0.250"
Warranty: 3 Year Manufacturer
Ingress Protection:


  • Charge using only compatible charging systems
  • Store at around 50% charge in cool, dry conditions
  • Do not mix with other battery technologies directly
  • Always charge at above freezing temperatures, unless configured properly
  • Never overcharge, over-discharge, or overload your cell
  • Ensure they are used within the proper operating temperature range

General Care

Here is some simple care info to help you maximize performance, protect your LiFePO4 battery and
maintain safety.

LiFePO4 battery technology is among the safest available but can still be dangerous if
not handled or utilized properly, as with all batteries. LiFePO4 cells have some very specific
characteristics and must be treated differently from Lead-based and other batteries. Once installed in a
proper system, they are very simple to maintain and utilize.

  • Charging should be performed using a CC-CV (Constant Current - Constant Voltage) system.
  • NEVER charge at or below freezing temperatures (0°C, 32°F).
  • Optimal charge and discharge rates for longevity range from 0.1C to 0.5C.
  • Store out of direct sunlight, in a cool, dry place to help avoid cell deterioration.
  • Charge at least once every six months, when in storage, to combat self-discharge. LiFePO4 cells generally do not like to rest in a fully charged or full discharged state for any period, this will accelerate capacity and performance loss.
  • The standard operating range for usable Amp hour (Ah) capacity is 20% - 100%. Depth of Discharge (DoD) 80%.
  • Batteries are shipped in a partial state of charge. Charge before using.
  • If a pack becomes completely discharged for any period, charge to full immediately.


  • Do not submerge, drop from a height, impact, disassemble, short circuit, over current, overcharge, over-discharge, crush, burn, puncture, reverse polarity, overheat or tamper way with the battery pack.
  • Do not use the pack if it shows signs of damage, deformation, discoloration, leakage, producing
    odor or water contact.
  • If leakage occurs, do not allow contact with skin or eyes. Seek medical attention immediately if
    you come in contact leakage.
  • Always safely dispose of and recycle our products.
  • Use only according to our guidelines and recommendations.
  • Do not mix directly with other battery technology.
  • Charge using only a compatible system.
  • Use only proper connectors, properly sized with a properly sized wire that is secured correctly. Never solder directly to the terminals.
  • Charge at minimum once every six months when in storage. Monitor for low voltage and do not allow the pack to become completely discharged.


The main issue leading to malfunction, loss of capacity and diminished performance is improper charging. Charge current must be tapered down adaptively as charge voltage rises and the battery state approaches full. LiFePO4 batteries can not properly accept charge power once fully charged and prefer to sit idle while in a partial state of charge. You immediately risk damaging or reducing the life cycle of the battery when held completely charged or discharged for any period. You should avoid float, trickle and equalization charging when possible as these settings are designed to maintain Lead batteries in continuously fully charged states. When not in use, simply leave the battery in a partially charged state. You do not need to charge immediately after use unless they are completely discharged, or generally below 20%. 50% to 80% is ideal. To slow capacity loss over time, store in cooler dry conditions and charge up after six months to combat self discharge.

A LiFeP04 cell is essentially fully charged at 14.2V (3.55 Vpc). Charging above this voltage is acceptable but additional power gain is negligible and the risks of over cell charging due to cell imbalance becomes drastically elevated.

Low temperatures reduce the rate at which the battery can properly absorb current. Lithium ions, with no where to go, will begin piling up on the anode. This leads to irreversible Lithium metallic plating which will essentially begin instantaneously. Performance, output and lifecycle become diminished and the battery becomes increasingly less safe under stressful conditions.

We do not recommend charging below 0°C (32°F). It is safe to charge your battery between 0°C and 45°C without extra care.

The following rule of thumb applies when charging below 0°C to avoid non-reversible, capacity diminishing damage.

  • Current must be reduced to:
    • 0.1C max from -10°C to 0°C
    • 0.05C max from -20°C to -10°C

Charging efficiency decreases above 40⁰C.

  • Use only chargers that specific to LiFePO4 technology. Other Lithium chargers and Lead Chargers may not have the same charging requirements and can damage your cells.
  • Use a Constant Current (CC) - Constant Voltage (CV) charger with cut-off at 14V - 14.6V.
  • 0.2C charge rate, or less, is recommended to increase cycle longevity and decrease capacity loss.
  • Up to 0.5C charge rate is generally acceptable.
  • 1C is the maximum charge rate and it should not be utilized unless for short and infrequent periods.
  • If you must charge with a charger designed for other battery types you must ensure it falls within proper current and voltage parameters.
  • Do not float, trickle or equalize charge.
  • If you are using a system that has a standard Float parameter, set it OFF or low as possible 12.8V - 13.6V
  • If you are using a system that has a standard Absorption phase, set it OFF or as low as possible 0 - 10 mins. 14V - 14.4V


  • LiFePO4 batteries operate optimally while discharging around 0.2C.
  • Up to 0.5C is generally acceptable.
  • 1C discharge should only occur very minimally and for a short duration. For instance, current spikes.
  • We do not recommend discharging below 20% remaining capacity, past 80% DoD. Power will drop off drastically and stresses to the battery only become heightened.
  • Discharging the battery fully will decrease performance, capacity, and cycle life.
  • Store the battery between 0.5C and 0.8C.
  • Never leave the battery discharged below 20%, charge immediately.
  • If a pack is left for any period in a fully discharged state, charge fully immediately and cycle to restore full capacity and function


 Junlee Lithium Technology battery product does not sufficiently meet the outlined performance specifications, a full refund is to be given once the product is returned, inspected and proven faulty.

Seller assumes 3 year manufacturers warranty, provided the product is used and maintained according to the recommended operational and maintenance parameters that are to be agreed upon at the time of installation.



Q:What is special about lithium batteries?

A:With high energy density, it has reached 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries. Long service life, life span can reach more than 6 years. Light weight, the weight is about 1/5-6 of the lead-acid product under the same volume


Q:What is a lithium battery used for?

A:Lithium battery use for power and energy storage. Like emergency power backup or UPS. Dependable electric and recreational vehicle power,golfcart,reliable and light-weight marine,solar power storage,surveillance or alarm systems in remote locations.


Q:What is the difference between a lithium battery and a lithium-ion battery?

A:It mostly comes down to the fact that lithium-ion batteries are rechargeable while lithium batteries are single-use. Lithium battery have a higher energy density than lithium ion batteries.



Q:Which battery is better alkaline or lithium?

A:Lithium batteries are lighter than alkaline batteries, so they offer an advantage when used with portable devices, especially cordless power tools.A lithium battery can be used as a high-performing alternative to a standard alkaline battery. Lithium battery designed to last longer,making them a good choice for high-tech and smart devices. They can withstand extreme low temperatures. Lithium can operate without failing in a very cold climate, so it’s ideal for outdoor applications.

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Lithium-ion battery 12.8v 42ah power tools / Portable home appliances/rechargeable battery

¥458.00 ¥408.00