135Ah 1000CCA is the largest that will fit. I got mine from battery megastore on line £98 delivered, very happy with it after 2 years or so, others like Bix have not had a good experience with the same though.
I did say "others". There are also several who have good experiences with them.I also have had bad experience with one of these
I also have had bad experience with one of these
What actually happened, purely due to having too big an output or the brand?
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You can't have too big an output. Looks like Megastore had a bad batch.
Surely too much juice would blow the starter motor?
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You can't have too big an output. Looks like Megastore had a bad batch.
Ohms law, V over R = I, so whatever the capacity of the battery, the voltage is the same, the resistance of the starter motor is the same, so the current draw will be the same. The higher capacity just means that the voltage/current can be better maintained and for longerSurely too much juice would blow the starter motor?
Ohms law, V over R = I, so whatever the capacity of the battery, the voltage is the same, the resistance of the starter motor is the same, so the current draw will be the same. The higher capacity just means that the voltage/current can be better maintained and for longer
That is because the battery voltage dropped less when cranking.Ah OK, I did know that but thought the resistance on a starter motor was just extremely low so it could take super high amperage, which was limited by the battery. I definitely noticed a faster crank speed when I fitted my bigger battery. Same went for my old boat engine
That is because the battery voltage dropped less when cranking.
What actually happened, purely due to having too big an output or the brand?
P
Generally no because of the voltage drop in the jump leads and connections.Ah I see!
So when a car is jump started from a running engine with battery at ~14V does the starter run much faster?
Generally no because of the voltage drop in the jump leads and connections.
Not really, it just makes sure you are less likely to flatten the doner battery. It's quite possible to jump start a vehicle using a spare battery, I do it all the time, I keep a large tractor battery on trickle charge for just that purpose. It does tractors mostly and my digger cos I'm too mean to buy a new battery for it.Oh so is that why you need to run the engine on the donor car to make up the deficit?