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There are ‘booster’ cables and ‘jumper’ cables; you might carry a set of booster cables because they pack easier as they are small gauge wire. These will work from either a car or another bike battery if the downed battery is only lacking a top-off charge. Say your riding buddies charging system took a dive and his bike stalls, if one of you were carrying booster cables you’d just hook them up between the two bikes for several minutes to allow a charge transfer and the recipient battery should be ready to fire.
Jumper cables are large wire gauge and are usually capable of immediately transferring charge from a good host battery source to a recipient load.
Exception here might be if the recipient load happens to be an extremely drained or shorted out battery. This exception case can be hazardous, particularly if you choose to run the engine/charging system as the extreme load may damage components of the host charging system.
I’d recommend to never run the engine of a host bike or car to charge a downed recipient battery, unless you’re sure what condition the recipient battery is in.
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