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LiFePO4 Lithium Battery

BM12005

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):

Discharge
speed
Discharge
current(*)
Usable capacity
Lead-acid LiFePO4
 20 hours  C/20 100%  100% 
1 hour  55%  100% 
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

  
Lead-acid starting 
LiFePO4 
  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
  Zero maintenance 

Recommended applications:

Motorcycle, wheelchair, golf buggy, ULM, watersports, scooter, camper, etc.

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• Very long experience

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• Multi-technologies expertise

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