Hybrid battery, when to replace - Toyota Prius Forum : Prius Online Toyota Forums
User Tag List

LinkBack Thread Tools
post #1 of 2 (permalink) Old 04-23-2019, 02:35 PM Thread Starter
Junior Member
Join Date: Jul 2006
Location: South Central OK
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
(Thread Starter)
Default Hybrid battery, when to replace

What are the typical symptoms that indicate problems that might require hybrid battery replacement?

Anyone have experience with hybrid battery failure? Any advance warning?

Anyone have experience with GreenTech automotive hybrid battery replacement?

What are the odds that there will be a catastrophic failure that will strand you and or damage the car further?

Lately our battery charge level indicator seems to show more rapid discharge and charge than before. I observe the indicator starting out at say 25% and it charges up to over 80% in 1.5 miles of moderate driving. Faster that normal charge and discharge could indicate a problem/lowered capacity maybe.

A blah day in the country beats a whoopee day in the city!
patrick_g is offline  
Sponsored Links
post #2 of 2 (permalink) Old 05-16-2019, 05:17 PM
Junior Member
Join Date: May 2019
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)

I've been owner of (or maintained for a family member) about 5 Gen 2 Priuses ranging from 2006 to 2009. All are now approaching 200k miles. These are all Midwestern US miles in the vicinity of Indianapolis.

All 5 needed new traction batteries at 150k-160k miles on odometer. Only 2 gave MIL lamps on the instrument panel at time of battery replacement. All exhibited excessively high engine RPM under load (e.g. passing or going uphill). 3 had prominent and noisy use of the ventilation fan in the back seat indicating that the battery stack was warm. 3 showed erratic bar behaviors on the screen similar to what you described. 3 had poor gas mileage due to the battery being bad.

All 5 improved to normal behavior with installation of new traction battery.

I think the faster than normal charge and discharge you describe is a consequence of the battery's internal impedance rising with age. High battery impedance means the voltage reads are higher than normal under charge and lower than normal under load.

One of my 5 went into limp home mode when its battery finally died. You don't want to be in limp home mode at night on a busy street. The vehicle speed was under 25 mph with the instrument panel lit up like a Christmas tree.

Another downside of limp home mode is that the car has insufficient torque to drive it up onto a UHaul tow dolly, so you're looking at paying for a professional tow job.

To my knowledge there is no damage to the car by letting the battery totally fail. However, you stand a fair chance of getting rear ended in limp home mode.

Stay away from rebuilt traction batteries. I tried two and their lifetimes were fairly short. At this point there are very few youthful Gen II cells in the used market from which to do battery pack rebuilds. You'd simply be replacing bad cells with someone else's worn cells.

BTW, you can purchase on the internet some diagnostic software than runs on a laptop computer that (with an OBDII adapter module) allows you to read cell voltages via the OBDII diagnostic port. This tool allows you to see how cells sags under load. Having this measurement capability is a way to get solid tech data on your battery's state of health.

I got all of my new battery stacks (new Toyota-supplied cell clusters retrofitted to someone else's old battery cage) from AutoBeYours in Scottsburg, IN. Steve and Jenny can install a new battery stack in about an hour at reasonable price.

I find that a properly-tuned 200k mile old Gen II Prius with a new traction battery drives like a new Prius, although the valve clatter from the motor will probably remind you that the car isn't new.

Jim Olson
Indianapolis, IN US
jimolson52 is offline  

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

  Similar Threads
Thread Thread Starter Forum Replies Last Post
replace battery Don Tait Prius Battery And Charging 4 05-12-2015 09:18 PM
How often to check/replace Cabin Air Filter? LowCO2 Toyota Prius Technical - Q & A 9 02-08-2015 07:01 PM
$6000 to Replace Batteries? Roger V Toyota Prius General Discussion 17 10-12-2005 10:04 AM
how much does it cost to replace a burnt out HID headlight? SYNCMASTER Toyota Prius General Discussion 1 09-16-2005 05:14 PM
Will Toyota replace my Prius? cwynn Toyota Prius General Discussion 6 04-03-2004 11:54 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome