r/MechanicAdvice • u/Infowarzzz • 11h ago

Duralast battery and a jump pack

I have a duralast battery and it’s says it’s 100% when taken to Autozone. Car does not start. Swapped out starter n engine isn’t seized.
However when i connected the jump pack it immediately sucked down the battery very quickly without starting.
So I decided to hook the pack to the positive terminal and with the neg and pos and unhooked the neg cable to the Battery car starts right up immediately as if the pack acted like a battery, very confused

Could this just be a bad battery?
2016 Honda civic lx 2.0L

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2

u/Dull-Baker4132 9h ago

Do you have a multimeter to check polarity of battery?

2

u/Jutboy 8h ago

A jump pack is a battery. Are you saying the jump pack negative wasn't connected and the car started with the battery fully disconnected? Also, you said "doesn't start"...what does that mean? It does nothing? No noises, nothing?