The ALDI or Lidl chargers are "smart"3 stage chargers & you can leave you battery connected with no problems. At £13 are a good buy But they are not always in stock The Ring & CTEC chargers are very good but that much dearer
I have the Ring 16amp smart charger just over a year old and it would not work Tele Ring up and sent it back had a new two days after Great charger as it reconditions the battery at over £60
I GOT A 3.8 AMP maypole smart charger from towsure and its absolutly fantastic cost me 30 quid i have an 85amp battery always like new you can leave it on charge for upto 3months if you want to keep it conditioned , it goes into maintenece mode when it reaches its peak.
------------- ALWAYS A PLEASURE NEVER A CHORE. CRAIG