Jumper leads or lithium jumper pack?

[Cuppa]

auxillary deep cycle batteries don't really like being used as a cranker , it can shorten their life . the lithuium starter packs i think are great as many can also be useful for other things . some have torches , and USB and other connections so they can charge phones and cameras . i think someone should build in cardiac defibulators into them .

As a regular use for AGM batteries I would agree with you, but if anyone needs regular jump starting they have bigger problems to contend with. For the rare occasion my AGM’s are asked to provide extra load to my crank battery (for starting or for extended winching) they have coped just fine. They are now into their 9th year of use which suggests that an occasional jump start shortening their life is a bit of a myth....... and they also charge cameras, torches,computers, Makita 18v batteries, as well as running a fridge, a freezer, lights, water pumps, etc etc.

It’s about convenience as much as anything, no jumper leads needed, can charge all batteries from a single charger or from solar. Reassuring when travelling in remote areas.