The best replacement for jump start is jump-start.

The best alternatives to jump start are rated as following:
★★★★★  jump-start
★★★★★  jump start
★★★★  new battery
★★★  battery charger
★★  kick start
★★  jumpstart
★  push start

Your alternative for jump start is not listed? Suggest!
Speaking about jump start, one probably shouldn't forget about battery charger.

Other search terms related to jump start and their ratings are:
★★★★★ battery charger
You have in mind a companion for jump start and it is not yet here? Propose!



Google Trends

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jump start
jump-start
jump start