Can a Prius 2011 hybrid battery pack fit a Prius 2005???

The battery ECU (fitted inside the battery case) is different on the gen3 Prius to the gen2 the connectors are likely to be different as is the case and fixing holes. However that said the battery modules in the gen3 battery are improved on those in the gen2. The best solution (if you have the ability) is to change out all the modules from the gen3 case to the gen2 so using the gen2 ECU, relays, and connectors.

You should then have a HV battery that is likely to last the rest of the life of the car.

 

As BritPrius said, the 2010+ battery modules have an improved design and will fit with no problems in your existing Gen2 HV battery. Once you disconnect one of the two "Bus Bars" there are no high voltages to fear. Where are you located? There are several Prius knowledgeable independent service sites around the country that could help you.

JeffD

 

If you looked upon this as a mechanical job and replaced the modules one at a time or in pairs there really is nothing to changing the modules numbering them first with a felt tip marker before dismantling, and as Jdenenberg implied removing the safety link.

As if you used the 2011 modules there would be no need to charge and balance them. Your good spare modules could be sold to offset the cost.

John

 

That is great news for me! I didn't realize that the module were interchangeable. I got 217k on my Prius, and I see the signs of wear and tear on my HV battery, especially during a hill climb.

 

The gen3 modules have a lower internal resistance than gen2 this basically means less internal heating on charge or discharge helping keep battery temps down and efficiency up. The modules also have a higher max current capability of 130amps against 100amps in gen2.

 

Even better...thanks BritPrius. Now I am going to start looking for a 2010-2012 HV battery on eBay.

 

So if a dealer replaces a Gen II battery the buyer gets new-design modules?

 

I doubt it very much, but in the future it may happen. How are we going to know unless we open them up.

 

I have hope because it would be odd for Toyota (or any manufacturer) to make two different yet interchangeable types of modules/whatever.

 

I agree but they never did it for the gen1 where the gen2 modules fit (well kind of), but it would not take much to alter the cover of the old gen1 battery to properly take gen2 or even gen3 modules. Now I have opened a can of worms, all those lovely gen3 batteries going into gen1's 2 at a time.

 

So how did it go?

 

probably very well, people do it all the time

 

Since they have not been here for over 6 years, I doubt you will get a reply from them.