Jumper leads are a common item found in most cars and are used to boost dead batteries. However, there are a few different synonyms for jumper leads that you may hear from time to time. One of the most common is "booster cables," which is essentially the same thing. Other possible synonyms include "jump-start cables" or even just "battery cables." Regardless of what you call them, these leads are an essential item for any driver to have in their car, especially in case they experience battery trouble while out on the road. If you don't already have a set of leads, it's worth investing in a set to keep in your trunk just in case.