Information on Lithium LiFePO4 Batteries

12V LiFePO4 Battery Information and Comparison

12V LiFePO4 Battery

12V LiFePO4 Battery (Lithium Iron Phosphate)

Instead of LiFePO4, you might also see the abbreviation LFP.
It is a Lithium-ion battery having a lithium ferro(iron) phosphate cathode instead of a lithium cobalt oxide cathode.


Charge/Discharge Cycles of a LiFePO4 battery.

Besides being safer than a regular lithium battery, the advantage of a LiFePO4 battery is its large number of charge/discharge cycles.
With proper discharging and charging, you can benefit from a LiFePO4 battery for many years. On the other hand, often heavily discharging will reduce the battery's lifetime. At Iopscience you can read about in-depth research on LiFePO4, NCA, and NMC cells.


Fast and efficient charging.

You can safely charge a LiFePO4 battery when the temperature ranges from 32°F to 131°F (0°C to 55°C). From temperatures of 4°F to 32°F you should reduce the charge current to 5% of the battery capacity. For a 100Ah battery, the charge current is then 5A. Or better not charge it below 32°F.
Disconnect the charger when the battery has been fully charged.

What battery charger do you need?

First of all, do not use a trickle charger.
You can use any (car) battery charger as long as it complies with the battery specifications. However, a (car) battery charger with a "gel setting" or a "Lithium setting" is a better option. But best of all is a specific Lithium battery charger.
If your LiFePO4 battery will be charged by solar panels, then use a PWM or MPPT charge controller. You might read here about "Which solar charge controller". And here's more on PWM solar charge controllers.

What capacity should the battery charger have?

Usually, a Lithium battery charger has a capacity of 25% of the battery capacity. So, a 25A Lithium battery charger can charge a 100 Ah LiFePO4 battery.
For example, the Lithium battery manufacturer RELiON recommends a Lithium charger that can handle a charge current of 5A - 50A, with a charge voltage of 14.2V - 14.6V, for its 100Ah LiFePO4 battery.

What size solar panel should I use?

If you want to charge your LiFePO4 battery with solar panel(s), you can use that 25%-capacity rule again, recommended by the LiFePO4 battery manufacturers.

If your LiFePO4 battery is 100Ah, then 25% = 25 A. So you need a current of 25 amps. Solar panels work with 12 Volt. Multiplying 25A with 12V = 300 Watts, and that's then an appropriate solar panel size.


Dis-charging.

LiFePO4 batteries can safely operate with temperatures from 4°F to 140°F (-20°C to 60°C).
Because you can discharge this battery a lot deeper than a conventional lead-acid battery, you get more electric energy from it. In case of a 100Ah lifepo4 battery might give you the same electric energy, as you would get from a 170Ah lead-acid battery.
During discharge, the voltage of the LiFePO4 battery stays the same, where the voltage of a lead-acid battery drops.

If you keep discharging between 20% and 80%, then battery life may extend. Discharging too much will shorten it.

Continuous Discharge Current.
Usually, the maximum continuous discharge current is the battery capacity times 1 (also indicated as 1C). A higher discharge current will shorten the battery life. Therefore it is important to know the demands of your application.

High and low temperatures.
Another advantage of LiFePO4 batteries is that in cold and hot weather these batteries lose less capacity than lead-acid batteries.


Battery Management System(BMS)

LiFePO4 batteries feature a built-in BMS, an electronic system that monitors all cells from a battery and protects it against over or under-voltage, over-current, high temperature, or external short-circuiting.

In case the battery has been disconnected by the BMS due to a voltage issue, then you should remove the load and charge right away.


Positioning, Ventilation, and Weight.

Lifepo4 batteries can be placed in an upright position or on their sides.
Although there's no need for ventilation, there should be enough space around the battery. The weight of the battery is a lot less than a lead-acid battery.


Storage.

If you want to store your Lifepo4 batteries for longer than three months, a temperature range of 32°F to 77°F (0°C to 25°C) is advised.
Try to keep the state of charge(SOC) between 50% - 80% during storage.


12V LiFePO4 battery applications.

You can also use these 12V batteries for 24V or 48V applications. You just connect them in serie. Connecting the positive terminal (+) of one battery to the negative terminal (-) of the other battery. So with 2 batteries of 12V you then have a 24V battery. In this way 4 batteries of 12V make a 48V battery setting.

LiFePO4 batteries are suitable for:
Home (solar) energy storage systems, UPS backups, lighting, digital/CCTV cameras, portable TVs, recreational vehicles RVs), automated guided vehicles (AGV), low-speed vehicles (LSV), utility vehicles, e-Robots, electric vehicles, DIY loudspeakers, 12V routers, air pumps, fish finders, golf cars, trolling motors, RVs, houseboats, boats, travel trailers, etc.

Remember that you don't use a LiFePO4 battery as a (vehicle) jump starter battery.


Costs comparison

Although a lifepo4 battery is more expensive than a lead-acid battery, the long lifetime and usage convenience should make that the total operational costs are not higher. On the contrary, the costs are quite a bit less than a lead-acid battery.

Cost comparison over life cycles of four battery types:
FLA (Flooded Lead Acid)
AGM (Absorbent Glass Mat)
GEL (Gel as electrolyte)
LFP (Lithium Ferro(iron) Phosphate, or LiFePO4)

Cost factors FLA AGM GEL LFP
Price Indic. $185 $270 $400 $1,050  
Installation
cost
$25 $25 $25 $25
Maintenance
cost
$525 $40 $40 $0
Charging
cost

$970

$970

$970

$850
Replacement
cost
$2,600   $5,450   $3,000   $0
Replacement
labor
$700 $1,000 $375 $0
# of
Replacements
14 20 7 0
# of Cycles
over life
500 400 1,000 7,100
Total costs
over life
$5,005 $7,755 $4,435 $1,925
Cost per cycle $0.67 $0.92 $0.55 $0.27
Source: RELiON Batteries

See Amazon ad links below for information, reviews and best pricing ofthe RELiON RB100 LiFePO4 (LFP) 12V Battery

RELiON RB100 LiFePO4 video:


the Mighty Max 100Ah Gel 12V Battery


the Renogy 100Ah AGM 12V Battery


the Exide BAT0122 100Ah FLA 12V Battery


Below, you'll find more well-rated LiFePO4 12V batteries
(in ascending order of battery amps).

The Miady 12V 16Ah LiFePO4 battery

The manufacturer indicates that its battery is quite suitable for fishing electronics, solar power systems, electric sprayers, IP cameras, lights, and more...
The features of this battery model LFP16AH:

- Capacity: (nominal)12.8V / 16Ah - max. 204.8Wh
- Built-in battery management system(BMS)
- Discharge: low self-discharge rate
- Charging voltage: 14.6V
- Life cycles: 2000 cycles
- Battery weight: 4 lbs (1.8 kg)
- Dimensions: (L x W x H): 5.94 x 3.9 x 3.7 Inches
- Warranty: 18 months
- Price indication: $50

For this Miady 12V 16Ah LiFePO4 battery, see the Amazon ad link here for more information, reviews and best pricing. When stored, it is advised to recharge this battery every four to six months.



12V 50Ah Lithium LiFePO4 from Ampere Time

Features:
- Charge/discharge deep cycles: 4000+ cycles,
- Charging time: around 2.5 hours,
- Lifespan: 10 years,
- Max power output: 640Wh,
- Recommended solar panel size: 150W,
  (with effective 4.5h/day sunshine)
- Battery weight: 11.57 lbs / 5.2 kg,
- Dimensions, LWH: 7.99 x 6.53 x 6.69 inches,
- Warranty: 5 years,
- price indic.: $230

For this 50Ah LiFePO4 battery, see the Amazon ad link here for more information, reviews and best pricing. There, you'll also see Ampere Time 12V LiFePO4 batteries ranging from 6Ah to 300Ah



12V 100Ah Lithium LiFePO4 from ECO-WORTHY

Features:
- Charge/discharge deep cycles: 3000+ cycles,
- Lifespan: 10 years,
- Power output: 1200Wh ,
- Max. battery charge/discharge current: 100A,
- Battery weight: 22.93 lbs / 10.3 kg,
- Dimensions, LWH: 10.23 x 8.23 x 6.61 inches,
- price indic.: $370

Chart on LiFePO4 vs Lead-acid battery life This chart shows you the battery life.
Blue = LifePO4 battery, Yellow = Lead-acid battery.

For this 100Ah LiFePO4 battery, see the Amazon ad link here for more information, reviews and best pricing. There, you'll also see ECO-WORTHY 12V LiFePO4 batteries ranging from 20Ah to 50Ah



12V 200Ah Lithium LiFePO4 from Ampere Time

Features:
- Capacity: (nominal)12.8V / 200Ah - max. 2,560Wh
- Recommended solar panel size: 600W
  (with effective 4.5h/day sunshine)
- Built-in 100A battery management system(BMS)
- Max. load: 1280 Watts
- Discharge: low self-discharge rate
- Charging voltage: 14.6V
- Life cycles: 2000-5000 cycles
- Lifespan: up to 10 years
- Dimensions: (L x W x H): 20.5x 8.54 x 9.37 Inches
- Warranty: 5 years
- Price indic.: $700

For this 200Ah LiFePO4 battery, see the Amazon ad link here for more information, reviews and best pricing. There, you'll also see Ampere Time 12V LiFePO4 batteries ranging from 50Ah to 300Ah



12V 300Ah Lithium LiFePO4 from Ampere Time

Features:
- Charge/discharge deep cycles: 4000+ cycles
- Lifespan: 10 years
- Max power output: 3840Wh
- Recommended solar panel size: 900W
  (with effective 4.5h/day sunshine)
- Battery weight: 69 lbs / 31 kg
- Dimensions, LWH: 20.5 x 9.37 x 8.54 inches
- Warranty: 5 years
- price indic.: $1,200

For this 300Ah LiFePO4 battery, see the Amazon ad link here for more information, reviews and best pricing. There, you'll also see Ampere Time 12V LiFePO4 batteries ranging from 6Ah to 200Ah PLUS