Jump start 2010 with dead battery

If you have a way to connect it, a cell phone battery is powerful enough to “jump” a Prius. The 12v battery only powers the electronics. The actual engine start is done by the hybrid battery. If the jumper you bought won’t do it, either the jumper is dead, or the 12v battery is very low. If you have a volt meter, measure the voltage of the 12v. Less then 12.6 but more then 10.5, charge and load test it. Less then 10.5, replace it.

 

And if you get in the trunk and it has the original 2010 battery in there, just replace it anyway. The factory original battery will likely have a yellow sticker and say “S46B24R” in large black lettering. The newer Toyota batteries have multicolored stickers on them and small lettering.

 

instead of a jump pack, buy a maintainer

 

A jump starter's good to have. Look into smart chargers (3~4 amp range) and electronic load testers as well. Armed with all three, you'll likely only be using the jump starter on other cars. Still good to have, you don't want to use the dimunitive Prius 12 volt for jump start assistance; I think the Owner's Manual warns against it.

 

This is 100 amp pack/battery backup and it has started my 4.6 Explorer when the battery was so low the lights didn’t come on. I think it will handle a Prius if I ever need it for that. LoL

 

thats not the jumper. prius does not have a normal starter motor, the hybrid battery powers thetranny which turns the engine over
what you're looking for, is the 'ready' light on the dash

if you're getting that, and the engine tries to start but doesn't, you have bigger fish to fry

how many miles on her?

 

Old school

1700 Peak Amp 12 Volt Jump Starter - Clore Automotive

 

The 12v in your car is likely bad. That is a very safe assumption based on your booster behavior.

 

no dash lights?

 

The 12V battery also gets to run the power brake accumulator, which triggers before the ignition is even turned on. This will probably clobber cell-phone-size batteries.

I strongly doubt that sound was from attempted engine rotation. More likely from the previously mentioned brake booster.

During a normal jump, you should be home free the moment the "READY" light turns on, generally several second before the ICE starts to turn over.

 

sounds like you're going to need a smart charger

 

If the battery you are jumping, is super weak, or has a shorted cell, it will possibly draw a lot of
power trying to charge and very little power will get to the computers. You would need a very
strong jumper battery that could handle that.

 

Did you try to power on the car immediately after hooking up your jump kit or after waiting a couple of minutes? The one I have requires a few minutes to transfer enough charge to the battery to power on the car.

 

I failed to mention the brake pump. But yes, slightly more then a cell phone size booster would be required. But with even more info from the OP the assumption the 12v is toast is building more and more steam.