12 volt battery for 2009 Prius

There's nothing that unusual with 2nd gen Prius battery install, AFAIK. Hopefully someone with a 2nd gen will chime in with more detail, but basically:

1. Put on safety glasses, or full face shield if you have it.

2. With a 10 mm wrench loosen the locking nut on the negative (black) cable at the post, pull it off, and for security stuff it into a heavy work glove.

3. Remove the positive cable clamp similarly.

4. Remove hold-down bracket.

5. Install new battery in reverse.

A few extras:

a) If you want to avoid losing memories (radio for example, and maybe engine trim settings, which will be re-learned), look into memory saver devices. A jump pack with an OBD memory saver cord with indicator light is good.

b) With the new battery, it's good to hook the battery up to a smart charger, for a complete charging session. Perhaps store can even do this.

c) While the battery is out, clean the inside of the cable clamps with a wire bristle brush or sandpaper. There are tools available expressly for that purpose. Do the same with the posts of the new battery. With the latter, be careful with the dust, it is lead.

 

try another auto parts store, sears or batteries plus. you can also buy a battery online and have a local mech install it.

 

Unplug the 2 black wires plugged into the red positive fuse assy. Press there white clips and remove.
Unbolt the negative lead no sparks as you have already removed the 2 positive wires. Unbolt the battery hold down clamp. Remove battery. With battery now on bench unbolt the positive fuse assy and move it over to the new battery. Move over the negative wire clamp. Reinstall.

 

I bought a brand new 12v battery from Batteries Plus, after driving 60 miles, switched it off and it wont switch back on after few seconds. what can be the issue, if some one can guide...

 

Maybe check the voltage (with a digital multi meter) directly at the battery posts first. This to check if the battery is the problem, or it's something in the connections.

It should be reading around 12.6 or higher. 12.2~12.5 would be an ailing battery, in particular the lower end of that range. Anything lower, I'd say they sold you a dud.

If the battery voltage is good, next step would be to verify the clamps at the battery post are tight, and same for the connection between negative cable and car body.

 

if I was there I would turn on the headlights. They should be nice and bright. If not:

Check the voltage at the under hood front jump point to ground. That measures the 12 v battery, thru the fuses that are in the positive post assy, the interconnections at the battery, and the long heavy duty cable that goes from the positive battery assy to that front jump point tang your measuring at. Many places to fail from the battery in the hatch to that fuse box. A measure at the front jump point tests them all.

If the battery tests low at the FJP then go in the hatch and test across the 2 battery posts. If it tests different voltage there then the front you have a bad ground connection at the battery.

Last time I replaced my battery i sanded down the spot to bare metal the negative cable eyelet bolts to the back wall of the battery well. Greased that connection and bolted it up.

It only matters what voltage at that front jump point as that is main B+ into the fuse box.

 

I have a question on the 12V.

I called the dealer today to price one for daughter's 2007. Price is $221. The first thing he asked me is if it has the smart key system.

Why would that matter?

 

Because the SKS battery is bigger than the non SKS one. The non SKS battery is also more expensive so its actually cheaper to change the battery holder to the SKS one and use the larger SKS battery. You would change the part to:
Battery Tray - Toyota (74440-47020)
Battery Tray - 2004-2009 Toyota Prius (74440-47020) | Tracy Toyota Parts

 

Thanks. Her Prius has the smart key. That must be why he said "$243 . . . uhh I mean $221".