Over the journey I have opted for Yuasa if available, donít know if they are the best or not but I have never had any issues whatsoever and you canít kill them with an axe..
No need for special chargers, take a flat one to bed with you, give it a cuddle and in the morning itíll jump start a truck..!
On my 2017 Nordkapp trip, I had a slight indication the current one (so to speak), was getting tired so I got a new one when I got off the ferry in Norway. The young bloke broke every rule (apparently) in doing the initial charge procedure, yet the thing is still working perfectly.
For me batteries are like tyres, there may be better out there, but I just ďfeelĒ better with Yuasa and Michelin.
Iíll leave the experimentation to someone else...
Donít feel queasy about asking battery questions, but while youíre here can you tell me what your thoughts are on what oils you think are best...?