Lyndon,
From the Battery University - LiFePo4 - LFP Longevity (BU-205: Types of Lithium-ion - Battery University):
"Li-phosphate is more tolerant to full charge conditions and is less stressed than other lithium-ion systems if kept at high voltage for a prolonged time. (See BU-808: How to Prolong Lithium-based Batteries)."
Reading further down the page the table indicates around cycle life:
2000 and higher (related to depth of discharge, temperature)
Interesting.
At least we can control the depth of discharge - I set mine to 20%…
Cheers,
AP.