Your post prompted me to have a look at two of my spare batteries in the garage. I probably last charged them about 2 or 3 months ago on a standard (non-clever) charger. At the time my son-in-law had problems starting but it always started with a freshly charged battery and then eventually wouldn't start at all. But it was the starter solenoid at fault so I kept the batteries charged until I replaced the solenoid which was probably in April. They haven't been charged since.
The Bosch battery read 12.7v / the Tudor just over 13v.
Regards
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