Got hold of a 120a booster to test yesterday, (cost £100 ish)
Drained a battery to dead flat on my brother Pulser gtir, and tried it.
after less than a minute of booster charge, it started easierly,
so i disconected the king ht lead, and turned it over, and it was fine for that too.
So going to buy a 120 - 200 amp booster/starter from Machinemart for £60-80, matters what they have at the shop when i go there.