03 S60 won't JUMP START after sitting for a year.

radium2013 · Post by **radium2013** » 05 Mar 2023, 20:15

My 03 S60 has been sitting for one year. I didn't start it in the period so the battery is obviously dead.
Today, I tried to jump start it with an external USB jump starter. But I got nothing after turning the key, no dashboard, no sound, no crank...
Now I am thinking about remove and recharge the battery and try again.

But anyone know why nothing happened with USB jump starter? It worked before with shorter sitting period, like for a winter or so.

Any tips are appreciated!

Post by **cn90** » 05 Mar 2023, 20:21

The External USB jump starter is only good for minor discharge.
Let's say you are on vacation for 2 weeks, and come back, the battery voltage is 11.50V, the USB
charger can bring it up to 12V to start the car.

But if your battery is down to 6-7V or flat, the USB charger is useless.
In that case you need the 120V charger.

You may need a new battery soon.
At this time, Cost Exide H6 battery is only $119.

Most other batteries H7, H8 are now > $160 and up.

Post by **abscate** » 06 Mar 2023, 03:43

A battery that sits for a year will be dead and need replacing. It will draw Down the jump start and cause running problems even if it does start

Post by **volvolugnut** » 06 Mar 2023, 08:38

Modern Volvos do not like weak voltage. In the old days, a battery that would crank at a moderate speed would likely start the engine. Those days are gone. When a battery is badly discharged, like yours, it will take a serious amount of power to jump start it. Serous battery power can only flow through heavy wires.
volvolugnut