i just go for the Sealed acid battery..biltema had some real fine ,,they fit the simpel load sentive loadsystem on sohc..
..have dropped the open ventilated type..china made.
(have used them for years..not have problems) but.the last 2 did not last..i got one new on garentie,
,but it just stayes in the shop as a renember,,not to bay to theep...