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So last Friday 8th June I started to charge a 20 Ah VRLA, the parallel battery a 75 Ah leisure battery had just been used with the caravan motor mover so to start with the charge rate was 3.8A quickly dropping to 3A, and then 0.8A by Saturday sitting at 0.1A where they stayed until this Friday. 5:21 am the 20 Ah VRLA started to take charge, then two more peaks as shown, but by 6 pm it had settled down to 0.1A charge again and 13.4 volt, while connected in parallel with the 75 Ah switching off the charger dropped to just over 4 volts. I need 7.3 to 7.5 volt before it will charge without a battery in parallel.
Now I need to consider how long before I accept the battery is duff? The 7 Ah batteries took nearly a week, but once they started then they fully charged, so this is a different pattern. However at 13.4 volt it can remain on charge with no worries.
Has any one used one of the so called smart chargers, like the CTEK MXS 3.8 to revive a VRLA and what results did they get? Or am I on my own being able to monitor what the charger is doing? I am using a MiHome energy monitor on input to battery.