Newpriusbatteries install problem with positive and negative

Contact NewPriusBatteries. Get it straight from the seller! Can't go wrong.

 

There are 2 different harnesses and likely different instructions for Gen 2 vs Gen 3. I hope you received the proper ones.

@2k1Toaster is here quite often.

 

There are 4 big cables that have that kind of lug on them.

2 are the safety switch legs
2 are the + and - neg side of the battery side relay.
The short one is the negative that goes to the negative side of the relay.
The positive is the long one and that goes to the + side of the relay.

But I understand what your saying I found it was backwards also.

After bolting it up and before installing the car side legs put the safety switch back in and measure across the battery side relay and make sure you have 230-240 volts and the polarity is correct. My NPB was kinda low at there at 218 volts. Its started right up though.

Then after measuring there make sure you remove that safety switch before proceeding.

Good Luck.

 

A brand new factory replacement battery from Toyota is around 218-221 volts. That's ~7.8 - 7.9 volts per module.

Do the NPB batteries come charged up to 8.2 - 8.6 volts per module (equivalent)?

 

I thought it was going to be fully charged to max. But your right it started right up.

 

Did you get everything straightened out and installed, and the car is running?

 

The instructions are for Gen-2 Prius. The overall instructions which are bolded in the email sent out to all customers is "like for like". That's the only thing you have to worry about. I've seen some wonky batteries with all types of modifications. I would NEVER assume the position of the main negative and positive connections. Ever.

As our instructions state, when you get to your old battery all you have to do is note where the main positive and main negative cables go. The original modules have (+) and (-) markings on them. Assume since the vehicle was working with those connections, that's how it should continue to be connected.

There are only 4 possible orientations of the battery. Only 2 orientations will have the safety disconnect side match the "lower" terminals and the main connections match the "higher" terminals. Now you're down to 2 orientations total. One starts with module 1 nearest the ECU, one starts with the highest numbered module near the ECU. Only 1 of these 2 orientations will match the main positive location and main negative location. And voila, you're done.

Like for like.

2 harnesses, same instructions as the battery building is the same. For the Gen-3 we instruct people to see how their car is taken apart on YouTube. I don't own a Gen-3 so I can't make a detailed manual. All the Gen-3 testing was done on other's vehicles and the install took no time, but no documentation was done as there are a million videos on YT already.

We ship them very similar to Toyota. We don't generally ship them higher than 60% SOC.