Setup: 4s 12-206Ah SOK LFPs. wired in series for 48V on an off-grid solar setup.
History: Used first in summer 2022, worked great. Batteries disconnected from system over winter.
Status: Spring 2023 individually charged each of 3 of the batteries full with the Victron BlueSmart 12V/15A IP65 charger
Problem: 1 of the batteries will not charge. While disconnected it reads at about 6.2V. When initially connected the charger reads about 7V/15A (via BT app) during "Test" phase but after a few seconds goes to "Absorbtion" at 14.4V/0.0A. I've repeated this several times with the same result.
Is there more I can do to wake-up this battery?
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when you connect batteries in series, there are 2 things very important.
the 1) do pre-charge before connect on inverter.
2) add the battery voltage balancer.
try this:
https://www.youtube.com/watch?v=9s2nw107oBY&t=120s