How many cycles will a battery deliver?
Inversely related to depth of discharge. A typical VRLA discharged to 100% of capacity each cycle manages around 300 cycles; the same battery at 30% depth of discharge manages around 800. LiFePOâ‚„ is a different order of magnitude, thousands of cycles at 80% depth of discharge. This relationship is why shallow cycling extends life, and why chemistry choice for a daily-cycling duty is usually decisive.