Classic Prius Replacement 12-Volt Battery - Page 2 - Toyota Prius Forum : Prius Online Toyota Forums
User Tag List

Reply
 
LinkBack Thread Tools
post #11 of 42 (permalink) Old 04-06-2007, 09:00 AM
Senior Member
 
Join Date: Mar 2005
Posts: 582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default old battery

Not quite sure how you are certain about the shorted cell?

Thanks for the feedback on elearnaid; I am sure it will prove helpful.

Please recycle the old battery responsibly.

DAS
tochatihu is offline  
Sponsored Links
Advertisement
 
post #12 of 42 (permalink) Old 04-06-2007, 10:52 AM
Senior Member
 
Join Date: Aug 2004
Location: Tampa Bay
Posts: 7,166
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Send a message via AIM to DanMan32 Send a message via MSN to DanMan32
Default

A Check Engine light will remain for 3 trips after the conditions that caused it to light have been removed.
A trip is defined as power set to READY, then turned off. Usually a drive is between setting to READY and powering off, but not a required event.
DanMan32 is offline  
post #13 of 42 (permalink) Old 04-07-2007, 03:39 PM Thread Starter
Senior Member
 
Join Date: Mar 2003
Location: Phoenix, AZ
Posts: 884
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
(Thread Starter)
Default Classic Prius Replacement 12-Volt Battery

Actually, "shorted cell" was just an educated guess, as this is the most common failure mode for auto batteries.

Lead/acid batteries put out about 2.1 volts per cell; hence, 12.6 volts typical (2.1 volts x 6 cells) for an automotive battery not under load or being charged.

Lead/acid batteries use sulfuric acid as the electrolyte; and when lead plates break down with usage, they sluff off lead-sulfate (PbSO4), the crusty white powder you see around fill-caps and leaking out of failed, "flooded-cell" batteries with split cases.

The battery fails when the lead-sulfate builds up and shorts all of the plates together in one of the cells. This chemical process is happening in all of the cells, all of the time. It just takes a couple of years for the build-up to bridge the gap between the plates. Anyway, whichever cell shorts out first usually causes the battery voltage to drop enough to cause starting problems (in normal cars). If you subtract 2.1 volts from 12.6, you get 10.5, which is usually what batteries measure when they fail in this mode.

The shorted cell isn't a hard short, because the lead-sulfate is not as good a conductor as solid lead or copper, etc. Therefore, besides getting reduced voltage (10.5 volts) and capacity (one less cell), you also get high resistance through that cell, which limits the amount of current the battery can provide -- a double-whammy.

Most PCs use 12 volts DC internally (along with other voltages), and I assume that the Prius computer components are no different. So, 10.5 volts from the battery is like a 96-volt AC brown-out from your 110-volt wall socket to your PC, which leads to unreliable operation and the ultimate computer crash. Luckily, this is easily (though, not inexpensively) remedied with a new 12-volt battery.

In the old days, battery checkers had spikes on them; and you stabbed through the top of the case to check the voltage on each cell. That would give you positive confirmation of the failure. New equipment just measures the voltage with the battery under load, and gives a generic failure indication. It probably really doesn't matter exactly what is wrong with the battery; it just doesn't work anymore, and you can't repair it -- It has to be replaced.

The AGM battery design is a little different from conventional, flooded-cell batteries, with distinct advantages and a few limitations. However, at heart, it is still a lead/acid battery and subject to failure, with time and usage.
Phoenix is offline  
 
post #14 of 42 (permalink) Old 04-14-2007, 10:45 AM Thread Starter
Senior Member
 
Join Date: Mar 2003
Location: Phoenix, AZ
Posts: 884
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
(Thread Starter)
Default Classic Prius Replacement 12-Volt Battery

The saga continues...

See additional related failures under "Inverter & Electric Water Pump Failure".
Phoenix is offline  
post #15 of 42 (permalink) Old 05-12-2007, 09:42 AM
Senior Member
 
Join Date: Aug 2004
Posts: 112
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Send a message via AIM to statultra
Default i

i replaced my prius battery with a 12 volt battery about the size of a lawn tractor one, in the process i converted hte postive and negative lugs to fit the bigger size of the electrode.

My toyota fleet, 01 prius,05 prius, 06 tacoma, 04 scion xa
statultra is offline  
post #16 of 42 (permalink) Old 05-12-2007, 09:44 AM
Senior Member
 
Join Date: Aug 2004
Location: Tampa Bay
Posts: 7,166
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Send a message via AIM to DanMan32 Send a message via MSN to DanMan32
Default

Sealed I hope. Preferably with a vent hose.
DanMan32 is offline  
post #17 of 42 (permalink) Old 05-13-2007, 06:54 AM
Senior Member
 
Join Date: Aug 2004
Posts: 112
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Send a message via AIM to statultra
Default

yes it is sealed, this was one of the few batteries i found with a vent

My toyota fleet, 01 prius,05 prius, 06 tacoma, 04 scion xa
statultra is offline  
post #18 of 42 (permalink) Old 05-13-2007, 05:50 PM
Senior Member
 
Join Date: Feb 2005
Location: Sacramento CA
Posts: 144
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Send a message via AIM to Frizzycat666 Send a message via MSN to Frizzycat666
Default

All this learned advise, Facts I have a 2001 Prius.. and replaced the 12v battery last year using toyotas replacement and modification kit "larger battery" it took me less than and an hour, I wasn't happy about having to do the mogs but for a larger battery I say ok, I tend to use my battery the old school way running the radio while I wax the car. Thimgs that probably need a bigger battery anyway.. and I consider 5 yrs from a 12v battery to be an acceptable life span for any car battery, not that toyota promised anymore anyway. Good Luck with your reeplacement

2001 original Pearl....

Livin the dream..........
Frizzycat666 is offline  
post #19 of 42 (permalink) Old 12-31-2007, 10:09 AM
Junior Member
 
Join Date: Dec 2004
Location: Scottsdale, AZ
Posts: 26
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default Re: Classic Prius Replacement 12-Volt Battery

Phoenix,
Concerning your battery, you stated:
Quote:
By the way, after I got the old battery out, it had a shorted cell and was only putting out 10.5 volts. So, the computer was running under brown-out conditions.
I was wondering how long your 12V original battery lasted? I also live in the Phoenix area, and I just passed 3 years on my battery. Since I've never had a regular 12V battery last more than 2-2.5 yrs in Phoenix, I was curious how long you and others in this area have had the original battery before it finally died.

2004 Package 7, Silver.
orbops is offline  
post #20 of 42 (permalink) Old 01-01-2008, 12:03 PM Thread Starter
Senior Member
 
Join Date: Mar 2003
Location: Phoenix, AZ
Posts: 884
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
(Thread Starter)
Default Re: Classic Prius Replacement 12-Volt Battery

There were other posts after the one you quoted, and this statement later turned out to be incorrect. The 12 volt battery was just discharged, and the root problem turned out to be the electric pump that circulates coolant through the hybrid module. I now have a perfectly good, used, Prius 12-volt battery sitting in my garage; and I suspect with the glass-mat construction and low draw on the OEM 12-volt battery that it would have continued to provide reliable service for several more years, if I hadn't replaced it as part of the troubleshooting process.

However, considering I have purchased nothing but gas, tires, oil and filters for the past six years, it is a small price to pay. And, it could have been avoided if I hadn't tried to troubleshoot the problem on my own. I ended up paying the same amount for the dealer repairs that actually fixed the problem. But, I now do not have to worry about problems with the 12-volt battery for several more years.
Phoenix is offline  
Reply

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



  Similar Threads
Thread Thread Starter Forum Replies Last Post
Sell my 2001 Prius hybrid 280 volt battery pack core Joekingiam Private Sales 0 06-20-2009 11:26 AM
Sell my 2001 Prius Hybrid 280 volt battery pack core Joekingiam Toyota Prius General Discussion 0 06-20-2009 11:25 AM
12V Battery replacement alternative for Classic! mlibanio Toyota Prius - Technical Chat 2 02-05-2009 09:46 PM
Classic Prius Tire Replacement Question kirby Toyota Prius General Discussion 8 03-18-2006 11:47 PM
Prius Auxiliary 12 Volt Battery Drain at Boot-Up and Engine Dick Larimore Toyota Prius - Technical Chat 7 05-27-2003 09:30 PM

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