Comparing LifePO4 battery with Lead-acid

Hi,
Welcome you to stay here for a while time.As public known,LifePO4 battery may become a substitute for Lead-acid battery in the near future.Now let us make a comparison between the LifePO4 battery and Lead-acid battery,and to learn about the advantages of LifePO4 battery.
[B]
Large current output(3C nominal, 5-8C burst),better vehicle performance[/B]
Compared with SLA, who can only offer up to 0.5C current then with the cost of capacity losing.
[B]Keep 92% capacity after 1200 times 80%DOD in 0.3C discharge testing.[/B]
The total life cycle about 2000 times, which is 6-7 times longer than Lead acid battery and 2-3 times longer than NIMH battery and other lithium battery, also maintenance free.
[B]Environmental-friendly,no heavy metals,rare metals.[/B]
SLA made serious pollution of the environment,and Lithium manganese no pollution but containning heavy metals,the other lithium ion battery also contain heavy metals.
[B]Small size,light weight.[/B]
The volume of LifePO4 battery is 65% of lead-acid batteries and the weight is 1/3 Lead-acid.but the most potable battery is Lithium cobalt.

Now,there are dozens of outstanding manufacturers for Lifepo4 batteries in the world.As I known,in China the main excellent provider including,BYD,Hipower,Skyenergy,Thundesky,etc.However, in whole world wide only BYD and Hipower have been listed into the top 20 companies with the largest quatity of patent.Hipower company has a four-year history of mass production.If you need any LifePO4 batteries you could consult them.

You can publish different views about above comparation,so that for our better communication.We will very appreciate you if you put forward some useful messages here,and benefit to some customers who were interested in Lifepo4 or lead-acid battery.Thank you!

I’ve heard that lead-acid (PbA) battery cells are more “forgiving” than Li-family battery cells if they are overcharged. Why is a Voltage Monitoring System (VMS) required when charging and discharging Lithium-Iron-Phosphate battery cells, while not required for lead-acid battery cells?

[QUOTE=blogradio;9588]I’ve heard that lead-acid (PbA) battery cells are more “forgiving” than Li-family battery cells if they are overcharged. Why is a Voltage Monitoring System (VMS) required when charging and discharging Lithium-Iron-Phosphate battery cells, while not required for lead-acid battery cells?[/QUOTE]

Lead-Acid’s only real advantage is up-front cost. Flooded cells can take overcharge, but it’s still not really good for them.

LiFePO4 prismatic cells cost more to buy but more than make up for it in longevity.

  • Lighter and smaller for the same capacity.
  • Capacity rated at 1 hour rate or under. Led acid at 20 hour rate.
  • Life cycle to 80% depth of discharge of 2000-3000 cycles.
  • Much lower internal resistance meaning more energy going to charging and less to heat. Charge efficiency nearly 100%.
  • Much more stable voltage from full to empty. Little motor power loss until cells are nearly empty.
  • Virtually zero self-discharge, meaning your batteries are still good and charged after winter storage. How many Lead-acid packs have been ruined like this?

Regarding using a Battery Management System with LiFePO4 cells, that’s a hotly debated subject. There are plenty of people that don’t use anything more than an amp-hour meter to make sure they don’t discharge the cells too far, and use a good charger (Zivan comes to mind) that hits the correct voltage setpoint it’s adjusted to. Many people start out using a BMS and end up going BMS-free after the BMS let them down, sometimes destroying cells. Sometimes they stop using the BMS after they confirm the reports of other non-BMS users. Most of the BMS supporters believe that without a BMS the cells will go out of balance and eventually overcharge or overdischage one or more cells. The BMS-free guys say they don’t observe any cell imbalance over time and that the BMS devices are actually causing the observed imbalance. In either case, occasional manual monitoring of cells with a voltmeter is still required to make sure the pack is healthy and/or the BMS is still doing it’s job.

Wow! great short and true description of LiFePo batteries, and BMS sytems.

Frank www.electricmgmidget.com