My first red !exclamation!

Please run the test at Weird stuff happening? MPGs dropping? Test The Battery | PriusChat after the car has sat MANY hours or overnight. Please tell us the 3 values (not just 1). Don't go changing the battery first until you tell us the values...

If you have HIDs, you can avoid unnecessary cycles on the lights by toggling between off and parking light positions.

Weird stuff can start happening w/a low or bad 12 volt. Don't waste $ on having a dealer "test" the 12 volt (07 Prius Dead - Any Guesses? | PriusChat).

 

Just buy an Optima, you are due!

 

The OP is in the UK where the Optima is now with delivery £206 or $330. Why pay this ludicrous price when in the UK we can buy Prius direct fit well known branded batteries with a 5 year guaranty for £50 or $80. Even the OEM battery is only £90. Unlike the US we seem to have a much better range of choice when it comes to batteries and the Optima must be near the bottom.

John (Britprius)

 

Pandalover, Varta and Bosch both do Prius 12 volt batteries for the Prius with up to 5 year guaranty and this is almost certainly your problem, although a little early compared to most peoples experience with the OEM battery.

Just make sure you get the version with the positive post on the left with the posts closed to you (the one with the posts the other way round is for the gen1 Prius).

Do not go to Hal---ds as they only list one battery for all the Prius "the wrong one" plus they are expensive. There are other batteries with much better capacity that will fit in the space provided but require sometimes a little work with the terminals.

If you need more information let me know.

John (Britprius)

 

i suppose 9.5v is bad.

 

Forget the yellow top it is very pricey and offers no advantage over other batteries in the UK at much lower prices.

Motorist shops will have Varta and Bosch from about £40 up to £55 dependent on guaranty length "up to 5 years" other makes include Lucas And Exide.

There are some really excellent mobility wheel chair batteries with up to 60% more capacity but the terminals as standard are different, screw in adapter posts are available but sometimes have to be ordered and judging by your voltages it's time you do not have.

In this country I would by the OEM battery over the Optima yellow top. Less than half the price for the same capacity and again the Optima has to be ordered and I am not sure it is available here with the correct terminal posts.

I can post Ebay links to suitable batteries but your local motor shop will have them or get them in hours. As I said in my previous post do not go to Hal----s nearly all the information they have on the Prius is wrong. Items I have found wrongly listed include battery, oil, and plugs.

John (Britprius)

 

Sorry mate, I missed that little fact when I read the post this AM at 5:15'ish!
Yeah, that price for a Yellowtop is rubbish! Go with a standard replacement. It just will not be as hefty as a Optima!
And yes, 9.5 volts = Kiss Of Death!!!

 

One other small point when you fit the new battery the car will not go into ready mode first time, you will have to shut it down and reboot a second time for it to get into ready mode.

You will also have to reset the drivers window by powering it down about half way then power up and hold the up button for a few seconds. You will also loose radio preset stations.

John (Britprius)

 

Your battery be bad, baby.

 

Could you give us the cost and warranty of your battery, not one I had named but still an excellent battery.

John (Britprius)

 

Not a bad price considering it includes fitting, but I would go back and ask for proof of warranty.

John (Britprius)