Universally_Challenged
Active Member
true of the ones 5 years with a 10ah gel battery in them. but 800amps isnt to be sniffed at.
rite
a dunno where you get 800 amps from - one of them says it's rated at 600
but - how long do you think a 12V 17Ah battery of the type thats primarily used as a battery backup in burglar alarms is going to be able to kick out that much current ?
they'll be fine for blowing lyres up and as an expensive torch, i bought one very similar to those at a farm auction for 99p, it didn't work but the 4mm red/black wire plus the clips was worth 99p - inside the battery was connected using badly crimped small spade terminal using 16/0.2mm wire - and that one said 1000A on the front
Universally_Challenged
Active Member
1. one of them has a 40ah battery inside.
2. its only a suggestion to get one of these insted of a secondry battery you'll have to disconnect, drag round the front and jump from.
like i said, i'd just buy the biggest batter that will fit in the space available, scratcht he 2nd battery, and isolate anythign that may cause the drain.
kooky_guy
Well-Known Member
I was always told you should NEVER have the engine on the donor vehicle running when trying to jump start another vehicle or you're likely to burn out (or at least damage) the diode pack on your alternator as they are not rated to supply such a massive current draw and the alternator is running the electrics when the engine is running, not the battery.
Fact or fiction?
Guy
well.......
if its true, it will bugger up a lot of peeps wot have a split charge system to power a winch.
not only that, but yu are likely to drain the donor cars battery and have two stuck motors.
if its true, it will bugger up a lot of peeps wot have a split charge system to power a winch.
not only that, but yu are likely to drain the donor cars battery and have two stuck motors.
kooky_guy
Well-Known Member
well.......
if its true, it will bugger up a lot of peeps wot have a split charge system to power a winch.
not only that, but yu are likely to drain the donor cars battery and have two stuck motors.
Doesn't the split charge system isolate the second battery though?
The donor car would have to have a pretty feeble battery if jumping someone elses' was enough to flatten it!
Guy
split charge only isolates the second battery when the alternator is not charging - to save draining two batteries - or the "loading" of one with the other.
how many times have peeps flattened a battery trying to start it? wot makes yu think they couldnt flatten a second battery?
how many times have peeps flattened a battery trying to start it? wot makes yu think they couldnt flatten a second battery?
kooky_guy
Well-Known Member
Ahh. Another of my assumptions bites the dust! :doh:
I'm not saying they couldn't flatten it, but if all that is wrong with the car with the flat battery is that the battery is flat then jumping with a good battery ought to start it straight away. If it has to churn over long enough to flatten the donor battery then it's probably not going to start anyway.
I'm curious to know the facts about this now. Everyone I've spoken to disagrees with me. I'm happy to be wrong, just curious to know the details! The chap that told me this was a real expert when it came to vehicle electrics (but that doesn't necessarily mean he's right!).
Guy
Universally_Challenged
Active Member
there are two main types of split relat chargers. one that links the two batteries when the engines running, affectivly linking the lives together, this is the ore heavy duty stile, allowing the aux battery to charge quicker
the other type limits the charge to the aux battery to about 10 amps. good for topping up a battery used for running leasure stuff, the caravan fridge or a cb install.
true, but sometimes you just cant get a good enought connection from the leads, so having 13 volts on the donor car will help to charge the flat before attempting to crank
