In this paper they claim the LFP charges four times faster than the SLA and show how that is done.
https://www.power-sonic.com/wp-content/uploads/2019/04/How-to-charge-LiFePO4-batteries.pdfIn the SLA graph it shows 25% charging rate and in the LFP graph they use a 40% charging rate. They then say the Bulk Stage using those rates takes four hours with the SLA and one hour with the LFP.
Beats me how 40% is four times 25%.
Usually the story is the Bulk Stage is shorter, ending at a lower SOC with SLA., so the LFP is faster for the time it stays at full constant amps while the SLA is tapering amps in the Absorption Stage. Or they say you can use 1C vs .25C to get the four times for the Bulk Stage. How do they get four times with .40C vs .25C?
Can anybody please explain? What am I missing?
