Battery charger recommendations please

[aussiblue]

Probably more than a century ago now. The first lead-acid batteries consisted of glass cells that were enclosed in tar-lined wooden boxes. A damp concrete floor could cause the wood to swell, breaking the glass inside. But it has also been suggested that old hard rubber cased car batteries had cases porous enough that battery acid could seep through it and create a conductive path through the damp concrete, draining the battery.

[Tassie f100]

I get your point but you are a bit out There never were 20 amp alternators.The smallest Lucas or Bosch used in Aust were 35 then 40 then 55 and so on.But does the alternator kill the battery or batteries made of lighter materials that just don't last