- Rechargeable LiFePO4 17340/CR123A 3.0V 350mAh Battery
- Life cycle: 2000 times (Traditional Li-ion: 500 times)
- Never explode or catch fire
- 100% Compatible with Disposable 17340/CR123A Batteries
- Working Voltage:3.2V and Peak Voltage: 3.6V
- Charging cut-off voltage: 3.6V
- Discharge cut-off voltage: 2.2V
- Please never overdischarge battery below 2.2V/cell
- You can safely charge these using the Ultrafire WF-138 Chargers set to the 3.0V mode
- Do not charge these with any lithium chargers for regular 3.6V batteries as they can have up to 4.2V charging voltage!
- Capacity: 350 mAh

LiFePO4 Battery

Innovation in Li-ion Battery:

LiFePO4 Power Battery, Faster charging and safer performance.

Although small capacity Li-ion (polymer) Battery containing lithium cobalt oxide
(LiCoO2) offers a the best available, lithium cobalt oxide (LiCoO2) is very expensive
and unsafe for large scale Li-ion Batteries.
Recently lithium iron phosphate (LiFePO4) has been becoming the "best-choice" of
materials in commercial Li-ion (and polymer) batteries for large capacity and high power
applications, such as laptops, power tools, wheel chairs, e-bikes, e-cars and e-buses.

The LiFePO4 battery has hybrid characters: it is as safe as the lead-acid battery and as
powerful as the lithium ion battery. The advantages of large format Li-ion (and polymer)
batteries containing lithium iron phosphate (LiFePO4) are listed as below:

1. Fast "forced" charging:
Because an overvoltage can be applied to the LiFePO4 battery it can be charged by only
one step of CC to reach 95%SOC or be charged by CC+CV to get 100%SOC. This is similar to
the way lead acid batteries are safely force charged. The minimum total charging time
will be about two hours.

2. Large overcharge tolerance and safer performance.
A LiFePO4 battery has a much wider overcharge tolerance of about 0.7V from its charging
voltage plateau of 3.5V per cell. When measured with a differential scanning calorimeter
(DSC) the exothermic heat of the chemical reaction with electrolyte after overcharge is
only 90 Joules/gram for LiFePO4 versus 1600 J/g for LiCoO2 . The greater the exothermic
heat, the more vigorous the fire or explosion that can happen when the battery is
abused.
A LiFePO4 battery can be safely overcharged up to 30V without protection circuit board.
It is therefore suitable for large capacity and high power applications. From the
viewpoint of large overcharge tolerance and safety performance, a LiFePO4 battery is
similar to a lead-acid battery.

3. Self balance .
Like the lead-acid battery, a number of LiFePO4 cells in a battery pack in series
connection can balance each other during charging process. This is due to the large
overcharge tolerance of the lithium iron phosphate chemistry. This self balancing
characteristic can allow 10% difference between cells for both voltage and capacity
inconsistency.

4. Four times higher energy density than Lead-acid battery
Lead-acid battery is an aqueous system. The single cell voltage is nominally 2V during
discharge. Lead is a heavy metal, its specific capacity is only 44Ah/kg. In comparison,
the lithium iron phosphate (LiFePO4) cell is a non-aqueous system, having 3.2V as its
nominal voltage during discharge. Its specific capacity is more than 145Ah/kg.
Therefore, the gravimetric energy density of LiFePO4 battery is 130Wh/kg, four times
higher than that of Lead-acid battery, 35Wh/kg.rence between cells for both voltage and
capacity inconsistency.

5. Simplified battery management system and battery charger.
Large overcharge tolerance and self-balance characteristic of LiFePO4 battery can
simplify the battery protection and balance circuit boards, lowering their cost. The one
step charging process allows the use of a simpler conventional power supplier to charge
LiFePO4 battery instead of using an expensive professional Li-ion battery charger.

6. Longer cycle life.
In comparison with LiCoO2 battery which has a cycle life of 400 cycles, LiFePO4 battery
extends its cycle life up to 2000 cycles.

7. High temperature performance.
It is detrimental to have a LiCoO2 battery working at elevated temperature, such as
60°C. However, a LiFePO4 battery runs better at elevated temperature, offering 10% more
capacity, due to higher lithium ionic conductivity.