BWB Model SS1250 Stainless Box 12.8V 50AH 640WH Lithium Iron LiFePO4 Deep Cycle Battery

$390.00$549.00 (-22%)

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GREAT COMBO SPECIAL OFFER now available for all our BWB LiFePO4 Batteries!

Lithium Iron Phosphate (LiFePO4) is a well-known lithium technology in Australia due to its wide use and suitability to a wide range of applications.

Characteristics of low price, high safety, and good specific energy make this a strong option for many applications.

It is considered as the safest, most enviro-friendly, Best/Excellent cycle life, most economical on long term costs, and an excellent temperature range from -200C to 550C.

Class A cell
Rated capacity: 50Ah
Cycle Life: BEV (Battery Electric Vehicle) 3000, ESS (Energy Storage System) 8000
Charging & Discharging Rate: 1C (50A charging & discharge rate)

BWB LiFePO4 Model no. SS1250

Warranty:  3 years effective June 1, 2021

Weight 6.9 kg
Dimensions 18.8 x 16.4 x 14.8 cm (18cm total height including terminals)

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Read more about our warranty below this page.

GREAT COMBO SPECIAL OFFER now available for all our BWB LiFePO4 Batteries!

 

About the Lithium Company:

 

Know more about BWB Lithium Iron Phosphate LiFePO4:

Lithium Iron Phosphate (LiFePO4) is a well-known lithium technology in Australia due to its wide use and suitability to a wide range of applications.

Characteristics of low price, high safety, and good specific energy, make this a strong option for many applications.

It is considered as the safest, most enviro-friendly, Best/Excellent cycle life, most economical on long term costs and excellent temperature range from -200C to 550C.

 

Why LiFePO4?

Of all the lithium options available, there are several reasons why LiFePO4 has been selected as the ideal lithium technology for replacement of AGM DEEP CYCLE. The main reasons come down to its favourable characteristics when looking at the main applications where AGM DEEP CYCLE currently exist. These include:

  • Similar voltage to AGM DEEP CYCLE (3.2V per cell x 4 = 12.8V) making them ideal for AGM DEEP CYCLE replacement.
  • The safest form of lithium technologies.
  • Environmentally friendly –phosphate is not hazardous and so is friendly both to the environment and not a health risk.
  • Wide temperature range.

For comparison illustration only, below you will find AGM vs. LiFePO4 100AH batteries.  The photo shown on top comparing 100AH AGM and our BWB 50AH LiFePO4 will tell you at a glance the difference.

Weight Comparison:

LifePO4 is one third weight of AGM DEEP CYCLE

  • AGM Deep cycle 100AH – 29.5Kg
  • LiFePO4 100AH– 10.5Kg
  • Benefits
  • Increases fuel efficiency
    • In caravan and boat applications, towing weight is reduced.
  • Increases speed
    • In boat applications water speed can be increased.
  • Reduction in overall weight
  • Longer runtime

Weight has a large bearing on many applications, especially where towing or speed in involved, such and caravan and boating. Other applications including portable lighting and camera applications where the batteries need to be carried.

Greater Life Cycle:

Comparison

  • Up to 6 time the cycle life
  • AGM Deep cycle – 300 cycles @ 100% DoD
  • LiFePO4 – 2000 cycles @ 100% DoD

Benefits

  • Lower total cost of ownership (cost per kWh much lower over life of battery for LiFePO4)
  • Reduction in replacement costs – replace the AGM up to 6 times before the LiFePO4 needs replacing

The greater cycle life means that the extra upfront cost of a LiFePO4 battery is more than made up for over the life use of the battery.    If being used daily, an AGM will need to be replaced approx. 6 times before the LiFePO4 needs replacing.

Flat Discharge Curve:

Comparison

  • At 0.2C (20A) discharge
  • AGM – drops below 12V after 1.5 hrs of runtime
  • LiFePO4 – drops below 12V after approximately 4 hrs of runtime

Benefits

  • More efficient use of battery capacity
  • Power = Volts x Amps
  • Once voltage starts to drop off, battery will need to supply higher amps to provide same amount of power
  • Higher voltage is better for electronics
  • Longer runtime for equipment
  • Full use of capacity even at high discharge rate
  • AGM @ 1C(100A) discharge = 50% Capacity
  • LiFePO4 @ 1C discharge = 100% capacity

This feature is little known but is a strong advantage and it gives multiple benefits. With the flat discharge curve of LiFePO4, the terminal voltage holds above 12V for up to 85-90% capacity usage. Because of this, less amps are required in order to supply the same amount of power (P=VxA) and therefore the more efficient use of the capacity leads to longer runtime. The user will also not notice the slowing down of the device (golf cart for example) earlier.

Along with this the effect of Peukert’s law is much less significant with lithium than that of AGM. This results in having available a large percentage of the capacity of the battery no matter what the discharge rate. At 1C (or 100A discharge for 100AH battery) the LiFePO4 option will still give you 100AH vs only 50AH for AGM.

Increased Use of Capacity:

Comparison

  • AGM recommended DoD = 50%
    • LiFePO4 recommended DoD = 80%
  • AGM Deep cycle – 100AH x 50% = 50Ah usable
    • LiFePO4 – 100Ah x 80% = 80Ah
  • Difference = 30Ah or 60% more capacity usage

Benefits

  • Increased runtime or smaller capacity battery for replacement

The increased use of the available capacity means the user can either obtain up to 60% more runtime from the same capacity option in LiFePO4, or alternatively opt for a smaller capacity LiFePO4 battery while still achieving the same runtime as the larger capacity AGM.

Greater Charge Efficiency:

Comparison

  • AGM – Full charge takes approx. 8 hours
    • LiFePO4 – Full charge can be as low as 2 hrs

Benefits

  • Battery charged and ready to be used again more quickly

Another strong benefit in many applications. Due to the lower internal resistance among other factors, LiFePO4 can accept charge at a much great rate than AGM. This allows them to be charged and ready to use much faster, leading to many benefits.

Low Self Discharge Rate:

Comparison

  • AGM – Discharge to 80% SOC after 4 months
    • LiFePO4 – Discharge to 80% after 8 months

 Benefits

  • Can be left in storage for a longer period

This feature is a big one for the recreational vehicles which may only be used for a couple of months a year before going into storage for the rest of the year such as caravans, boats, motorcycles and Jet Skis etc. Along with this point, LiFePO4 doesn’t calcify and so even after being left for extended periods of time, the battery is less likely to be permanently damaged. A LiFePO4 battery is not harmed by not being left in storage in a fully charged state.

PRODUCT SPECIFICATIONS:

** For presentation purposes, the specifications on tables below are for one (1) battery cell only.

 Charge Mode & Specification:

Description/ItemSpecificationsRemarks
Standard Charge Current0.5C
Standard Charge Voltage< 3.65V
Standard Charge ModeUsing 0.5C Constant Current (CC) to charge to 3.65V, then Constant Voltage (CV) at 3.65V to charge until charge current reaches the lower limit of 5.0+ 0.5A.
Standard Charge Temperature25°CCell Temperature
Absolute Charge Temperature0-55°CTerminating charge process, once the cell temperature is beyond Absolute Charge Temperature.
Absolute Charge Voltage<3.8VTerminating charge process, once the cell OCV is beyond Absolute Charge Voltage.

 

Other Charge Mode:

Cell TemperatureStandard ChargeRapid ChargeCell Temperature
<0°CProhibited to chargeProhibited to charge<0°C
0-10°CCharge Current 0.1CProhibited to charge0-10°C
10-15°CCharge Current 0.2CCharge Current 0.3C10-15°C
15-25°CCharge Current 0.3CCharge Current 0.5C15-25°C
25-45°CCharge Current 0.5CCharge Current 1.0C25-45°C
45-55°CCharge Current 0.3C
>55°CProhibited to charge

 

Discharge Mode:

 DescriptionParametersRemarks
Standard Discharge Current50.0A* 25°C
Maximum Continuous Discharge Current100.0A* N.A.
Maximum Discharge Long-Pulse Current200.0A* 3 minutes maximum
Maximum Discharge Short-Pulse Current300.0A* Cell temperature lower than 50°C
* When SOC>40%, 60s maximum
* When SOC<40%, 10s maximum
Discharge cut-off Voltage>2.5V* N.A.
Standard Discharge Temperature25°C* Cell Temperature
Absolute Discharge Temperature-20–55°CRegardless of the discharge mode, the discharge process should be terminated, once the cell temperature is beyond Absolute Discharge Temperature.

 

Charge cut-off and Protection:

DescriptionParametersRemarks
Charge cut-off Voltage3.65VTerminating charge process when cell OCV reaches 3.65V.
First Over-charge Protection>3.8VLimiting charge current to 0 when cell OCV reaches 3.8V.
Second Over-charge Protection>4.0VLimiting charge current to 0 when cell OCV reaches 4.0V.
Locking BMS before the problem is identified and resolved.
Discharge cut-off Voltage2.5VTerminating discharge process when cell OCV reaches 2.5V.
First Over-discharge Protection2.0VLimiting discharge current to 0 when cell OCV reaches 2.0V.
Second Over-discharge Protection1.8VLimiting discharge current to 0 when cell OCV reaches 1.8V.  Locking BMS before the problem is identified and resolved.
Short Circuit ProtectionProhibit Short CircuitCutting off overcurrent devices (fuses, circuit breakers).
Charging Time Protection<8hTerminating charge process when charging time exceeds 8 hours.

 

BWB Battery Cells Features:

  • 1 cell has 50AH 3.2V (4 cells = 50AH 12.8V total)
  • BMS (Battery Monitoring System)
    • The lithium battery monitoring system is a charge and discharge protection for the series lithium battery pack. When the battery is fully charged, the voltage difference between the individual cells can be ensured to be less than the set value (generally ±20 mV), and the battery cells of the battery pack can be uniformly charged, effectively improving the charging effect in the series charging mode. Simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature conditions of each single cell in the battery pack, protecting and extending the battery life; undervoltage protection prevents each battery cell from damage due to overdischarge during discharge.
    • Learn more about our BMS here: http://bigweibattery.local/product/new-daly-lifepo4-4s-12v-200ah-8s-24v-200a-16s-48v-200a-smart-bms-bluetooth/
  • Safety Pressure Release Valve
    • Standard new safety technology for high-quality batteries.
    • Prevents explosion caused by excessive internal pressures due to overcharging, short circuit, excessive temperature, battery deformation or puncture.
    • Safety valve on top if a very important for explosion-proof barrier. When pressure inside the battery is build up, the safety valve opens to avoid explosion.
  • No Memory Effect
    • Rechargeable batteries work under conditions that are often not fully discharged, and the capacity will quickly fall below the rated capacity. This phenomenon is called the memory effect. There are memories like nickel-metal hydride and nickel-cadmium batteries, but lithium iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can be used with charging, no need to discharge and recharge.

Learn more about our Lithium Iron Phosphate batteries here:  https://documentcloud.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3A69d8c8be-9601-4ef2-a916-4797982363d7

WARRANTY & PRODUCT SUPPORT INFORMATION

3 YEARS LIMITED WARRANTY

Big Wei Battery warrants BWB LiFePO4 Battery to be free of defects in material and workmanship for the applicable 3-year warranty period.  Warranty is only given to the original purchaser of this product.  The warranty does not extend to subsequent purchasers or users. The 3-year warranty period starts from the date of the original purchase of the product.

The maximum liability of Big Wei Battery under this limited warranty shall not exceed the actual purchase price of the product.

RETURN AND/OR REPAIR POLICY

We provide a warranty against defects for the period and application as detailed in this manual.  If you are experiencing any problems with your LiFePO4 Battery unit, you may call (07) 3090-3637 or visit us at our shop address located at Unit 4, 17 Moss St., Slacks Creek, QLD 4127 before returning the product to our business office.  The battery will be tested as per our test procedure. Proof of purchase is required during the claim.  Big Wei Battery will repair or replace any of the battery parts free of charge if found valid. The warranty excludes defects from after-sale damage, abuse, incorrect installation, or neglect. The benefits of this warranty are in addition to any other rights and remedies available at law. Costs of transportation to and from the Big Wei Battery shop will be shouldered by you. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

LIMITATIONS

This warranty does not cover damage or defects resulting from normal wear and tear including scratches, abrasions, chips, dents caused by mishandling, accidents, damage during shipping to our business office, unauthorized use or repair, continued use of battery even after it has stopped operating or malfunctioned, alterations, neglect, abuse, misuse, failure to follow recommended proper care and maintenance, acts of god, fire and flood. The natural capacity decrease is not supported within the 3-year warranty period.

LIFETIME FREE SERVICE

We offer Free Lifetime Service. So, whether it’s still under warranty or beyond the warranty period, our service is Free.  You will only have to pay for the parts or materials that need to be replaced when the product is beyond warranty.

TO MAKE A WARRANTY CLAIM

Write us an email to info@bigweibattery.com.au and include the following:

  1. Full details of alleged defect or fault and the circumstances surrounding the defect or fault
  2. Provide relevant evidence of the claim, including photographs of the product installed and associated system wiring
  3. Provide proof of purchase and payment

CAUTION

Please DO NOT OPEN the battery box for whatever reason without our authorization as it will VOID the warranty and we are not responsible for any DAMAGE/s it may cause.  These batteries are NOT designed for, nor should be fitted into an engine bay due to high heat.  Damage may occur and is not covered by BWB LiFePO4 Battery Warranty.

Additional information

Weight6.9 kg
Dimensions18.8 × 16.4 × 14.8 cm
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    Steven G (verified owner)

    I’m having more fun running my kayak doing fishing at the same time for hours and hours! Thanks BWB!

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BWB Model SS1250 Stainless Box 12.8V 50AH 640WH Lithium Iron LiFePO4 Deep Cycle Battery

$390.00$549.00 (-22%)

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