LiFePO4 Lithium Battery
Lead-acid batteries have historically always been present in engine starting applications, as they have very high short-circuit currents. However, they need to be concerned by the challenge from the arrival of Lithium Iron Phosphate batteries: the discharge currents are equivalent, but in the case of LiFePO4, this current is constant until the battery is discharged completely. In the case of a lead-acid battery, the greater the discharge current, the more the usable capacity of the battery is reduced.
This is a table showing the usable capacities of the 2 technologies depending on the discharge speed (and therefore the current):
|6 minutes||10x C||35%||92%|
|3 minutes||20x C||27%||90%|
|1.5 minutes||40x C||16%||80%|
(*) The current "C" corresponds to the stated battery capacity: for a 65 Ah battery, C = 65A
With its clearly superior performance, the "theoretical" capacity of the LiFePO4 battery can be reduced by a factor of between 3 and 7 compared with the lead-acid battery - for the same application.
Strong points of the 2 technologies
|Reduced volume (factor between 2 and 5)|
|Reduced weight (divided by 7)|
|Extended working life (2 to 5 times more cycles)|
|Auto-discharge very low if not used|
|Very fast recharge|
|Does not contain acid|
|Does not contain toxic substances|
|Less expensive to buy||Less expensive per cycle|
Motorcycle, wheelchair, golf buggy, ULM, watersports, scooter, camper, etc.