I agree with above regarding need for jump starting. May have offered to others once or twice in my lifetime, but the last time I benefitted was with an old van I ran on my Dad's market garden at the age of 15 or so.
Replacing battery every six to seven years irrespective with a branded one then using regularly with long enough runs to fully re-charge is a far better policy. If laid up for more than a few weeks, then a charger/conditioner on float will prolong life and ensure adequate starting when needed. No need for fancy brands costing the earth either, offering slightly greater longevity but prolonging the marginal capacity condition. I learnt this with laptops, better to upgrade regularly with cheaper model and up to date CPU than being stuck with an expensive one that refuses to die but becomes increasingly out-classed after a few years.
