|Features And Benefits When Compared To SLA
Welcome to the first of a series of articles regarding Lithium Batteries. This article will cover the features and benefits of a Lithium Iron Phosphate battery (LiFePO4) when compared to traditional Sealed Lead Acid (SLA) battery technology. Since the discussion is around LiFePO4 and SLA, the article concentrates on 12VDC and 24VDC applications.
Different Lithium Technologies
Firstly, it is important to note that there are many types of “Lithium Ion” batteries. The point to note in this definition refers to a “family of batteries”.
Lithium Iron Phosphate (LiFePO4)
Lithium Iron Phosphate (LiFePO4) is a well-known lithium technology in China due to its wide use and suitability to a wide range of applications.
Of all the lithium options available, there are several reasons why LiFePO4 has been selected as the ideal lithium technology for replacement of SLA. The main reasons come down to its favourable characteristics when looking at the main applications where SLA currently exist. These include:
● Similar voltage to SLA (3.2V per cell x 4 = 12.8V) making them ideal for SLA replacement.
Features and benefits of LiFePO4 when compared to SLA
Below are some key features a Lithium Iron Phosphate battery which give some significant advantages of SLA in a range of applications. This is not a complete list by all means, however it does cover the key items. A 100AH AGM battery has been selected as the SLA, as this is one of the most commonly used sizes in deep cycle applications. This 100AH AGM has been compared to a 100AH LiFePO4 in order to compare a like for like as close as possible.
Feature – Weight:
● LifePO4 is less than half the weight of SLA
● Increases fuel efficiency
● Increases speed
● Reduction in overall weight
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.
Feature – Greater Cycle Life:
● Up to 6 time the cycle life
● Lower total cost of ownership (cost per kWh much lower over life of battery for LiFePO4)
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
Feature – Flat Discharge Curve:
● At 0.2C (20A) discharge
● More efficient use of battery 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.
Feature – Increased Use Of Capacity:
● AGM recommended DoD = 50%
● 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.
Feature – Greater Charge Efficiency:
● AGM – Full charge takes approx. 8 hours
● 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.
Feature – Low Self Discharge Rate:
● AGM – Discharge to 80% SOC after 4 months
● 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.
At BSLBATT Batteries, we are a battery company which has been around for 15 years and have in depth experience and knowledge of a wide range of battery technologies. We have been selling and supporting Lithium batteries for many years into many applications so if there are any requirements you have or need any questions asked, feel free to contact us.
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