Lithium jump starter

[Ammonite]

Engine starting with Lithium can be difficult, due to BMS limitations.

Yes, this is what I was referring to but my post could have been clearer. As and when I replace the house bank with lithium I was planning to retain the SLA starter battery....hence the jump pack

 

[OCuea]

I have one of those 'lithium jump starter' units by Ring which is intended to crank up my ageing diesel estate.

It occurs that it might be a useful device to ferry out to the boat when I visit, on the offchance that the engine start battery is a bit depleted or feeling its age. One could make sure the jump starter thing was fully charged on the drive down to the boat.

Any experience? Any pros/contras?

Mine does what I want and is a few years old now. Starts my cold car ageing battery. USB outlet.

 

[AntarcticPilot]

I bought one expecting to do that (actually as a starter battery for my RC planes) However, I found that it will only work if actually clipped to a battery. One cannot just clip it to, say, the bilge pump & expect it to work.
In spite of Tranonas comments about having a proper system & never making having a problem it is possible to leave the batteries cross linked & run them down by mistake one day. I am sure many have done it so a backup is handy

I took have a Ring starter pack, which I need for my hobby car that doesn't do a lot of miles and has parasitic drains that discharge the battery. But I don't think the starter pack provides the starting current. I had to use it today and it charged the battery for about a minute before I could start the engine. So I think the principle is that the starter pack puts a minimal charge into the engine battery that is enough to operate the starter motor. You certainly can't connect it and immediately start the engine, as would be the case if it was providing the start current directly.

 

[Daydream believer]

I took have a Ring starter pack,

I never thought one needed a pack to start one's ring. Where do you attack the crocodile clips?