Is B-B charger for Lifepo4 lithium batteries needed?

Stage 2 is necessary in both chemistries to bring the battery to 100% SOC. ... In long-term storage applications, a lithium battery should not be stored at 100% SOC, and therefore can be maintained with a full cycle (charged and discharged) once every 6 – 12 months to 30% – 70% SOC.

https://www.power-sonic.com/blog/how-to-charge-lithium-iron-phosphate-lifepo4-batteries/