The Most common battery in the Lead acid jumper packs is an 18AH AGM battery.
I am not convinced there is much is any difference among the many different brands that one can find when searching 18AH AGM on Ebay or Amazon and prices range from 32 to 75$
The UB12180 is an Asian made AGM battery and could simply be relabelled by all the different sellers, but their indicated weights do vary according to the listing, which would indicate differences in internal structue, but who really knows without having weighing and testing them side by side.
One pays a lot for the jumper packs plastic housing and leads, but the batteries within are pretty easily replaced.
The Asian made UB12180 does NOT have the super low self discharge of higher quality AGMS, and they are not immune to sulfating when sitting in an undercharged state.
The Chargers which come in many of these jumper packs are single voltage low amperage wall warts, with many able to provide 0.5 amps and maxing out at 13.6v. Very far from ideal for a well discharged AGM
ideally, the UB12180 when discharged to 50% or below, would receive about 6 amps until 14.5 to 14.9v was achieved at the battery terminals, then that electrical pressure held until the flow( amperage) which is determined by the battery in a constant voltage stage, tapers down to just less than 0.1 amps.
AGMs can and will be tickled to death if heavily discharged and fed very light charging currents, even if they are held on the charging source for days and eventually reach full charge.
The ONLY way to determine full charge on an AGM is by holding it at the absorption voltages, and checking to see how much amperage the battery accepts. Once it tapers to 0.5% of the battery capacity at absorption voltage, only then can it be considered fully charged.
The green light on smart or incorporated charging sources is merely guessing at 'good enough'
A Lead acid battery promptly and properly returned to full charge ASAP will give great performance over an impressive lifespan. Anything less than this reduces its potential to some degree. The lower below a true 100% state of charge the battery rests at, and the longer it rests there, the faster it loses its capacity.
Misers wanting a jumper pack can just buy a 18Ah AGM and use jumper cables, or buy an old one in a garage sale and easily replace the battery, though some may require long reach torx bits to disassemble.
I've no personal experience with the lithium jumper packs but have herd them both blessed and cursed.
