What's a 'smart relay' when it's at home?
Do you mean a split charge relay? If so, I have that. Auto elec found that the earth wire had come loose, so the battery appears to have not been charging.
I have run the van for a few days no, and whilst the battery seemed better, it wasn't long before it made the pump intermittent. Hence the need to charge the leisure battery.
Just driving around doesn't seem to be helping.