Re: What's Wrong With My 2001 Prius ?!

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Old 13 Jun 2013, 12:31 pm   #1 (permalink)
larrymoencurly@my-deja.com
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Default Re: What's Wrong With My 2001 Prius ?!

On Saturday, June 8, 2013 2:21:11 PM UTC-7, casagi...@optonline.net wrote:
>
> Took it in to Toyota service, where they did some diagnostics. They
> proclaimed that everything checked out OK, including the battery ...


The only sure way to check a battery is by measuring the voltage of each
individual cell, but I don't think Toyota did that because that would
probably require opening up each small battery, and they may be glued
shut. Still, you may be able to narrow down the bad cell by measuring
each small battery under load (light load is OK, even 100mA). The
battery with the lowest voltage typically has a bad cell (or the most bad
cells). Readings won't be as accurate if you don't use a load.

Sometimes a cell has simply develop reverse polarity, and no amount of charging the whole battery will fix that, but connecting a charger directly
to the affected cell's terminals usually will, in just a few minutes. Don't
use a regular battery charger for this; use a DC source that can put out
roughly 100mA - 500mA, such as a 3 - 6 VDC power adapter with a
10-100 ohm resistor in series. Measure the voltage across the cell to
verify that it becomes positive and exceeds about 1.0V. If it does, keep
charging it. A cell is rated for 5 amp*hours (D-cell NiMHs are typically
rated from about 2-12 amp*hours) charged at 1/2 amp will require about
14 hours for a full charge. OTOH a cell that stays very close to zero is
probably shorted and needs to be replaced. Be sure any replacement
cell has the same amp*hour rating because most D cell NiMHs are
actually just C or AA cells in a bigger package.

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Old 16 Jun 2013, 08:03 am   #2 (permalink)
casagiannoni@optonline.net
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Default Re: What's Wrong With My 2001 Prius ?!

Thanks all !!!


On Thu, 13 Jun 2013 10:31:31 -0700 (PDT), larrymoencurly@my-deja.com
wrote:

>On Saturday, June 8, 2013 2:21:11 PM UTC-7, casagi...@optonline.net wrote:
>>
>> Took it in to Toyota service, where they did some diagnostics. They
>> proclaimed that everything checked out OK, including the battery ...

>
>The only sure way to check a battery is by measuring the voltage of each
>individual cell, but I don't think Toyota did that because that would
>probably require opening up each small battery, and they may be glued
>shut. Still, you may be able to narrow down the bad cell by measuring
>each small battery under load (light load is OK, even 100mA). The
>battery with the lowest voltage typically has a bad cell (or the most bad
>cells). Readings won't be as accurate if you don't use a load.
>
>Sometimes a cell has simply develop reverse polarity, and no amount of charging the whole battery will fix that, but connecting a charger directly
>to the affected cell's terminals usually will, in just a few minutes. Don't
>use a regular battery charger for this; use a DC source that can put out
>roughly 100mA - 500mA, such as a 3 - 6 VDC power adapter with a
>10-100 ohm resistor in series. Measure the voltage across the cell to
>verify that it becomes positive and exceeds about 1.0V. If it does, keep
>charging it. A cell is rated for 5 amp*hours (D-cell NiMHs are typically
>rated from about 2-12 amp*hours) charged at 1/2 amp will require about
>14 hours for a full charge. OTOH a cell that stays very close to zero is
>probably shorted and needs to be replaced. Be sure any replacement
>cell has the same amp*hour rating because most D cell NiMHs are
>actually just C or AA cells in a bigger package.

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Old 20 Jun 2013, 10:34 pm   #3 (permalink)
Hachiroku ハチロク
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Default Re: What's Wrong With My 2001 Prius ?!

On Thu, 13 Jun 2013 10:31:31 -0700, larrymoencurly wrote:

> On Saturday, June 8, 2013 2:21:11 PM UTC-7, casagi...@optonline.net
> wrote:
>>
>> Took it in to Toyota service, where they did some diagnostics. They
>> proclaimed that everything checked out OK, including the battery ...

>
> The only sure way to check a battery is by measuring the voltage of each
> individual cell, but I don't think Toyota did that because that would
> probably require opening up each small battery, and they may be glued
> shut. Still, you may be able to narrow down the bad cell by measuring
> each small battery under load (light load is OK, even 100mA). The
> battery with the lowest voltage typically has a bad cell (or the most
> bad cells). Readings won't be as accurate if you don't use a load.
>
> Sometimes a cell has simply develop reverse polarity, and no amount of
> charging the whole battery will fix that, but connecting a charger
> directly to the affected cell's terminals usually will, in just a few
> minutes. Don't use a regular battery charger for this; use a DC source
> that can put out roughly 100mA - 500mA, such as a 3 - 6 VDC power
> adapter with a 10-100 ohm resistor in series. Measure the voltage
> across the cell to verify that it becomes positive and exceeds about
> 1.0V. If it does, keep charging it. A cell is rated for 5 amp*hours
> (D-cell NiMHs are typically rated from about 2-12 amp*hours) charged at
> 1/2 amp will require about 14 hours for a full charge. OTOH a cell that
> stays very close to zero is probably shorted and needs to be replaced.
> Be sure any replacement cell has the same amp*hour rating because most D
> cell NiMHs are actually just C or AA cells in a bigger package.


I would not recommend ANYONE do ANYTHING with a Prius battery unless you
have prior experience with battery powered systems of this magnitude!

There is a very spcific way of removing the Prius battery pack and
connectors. The Toyota techs that work on the Prius are sent to school
for a couple weeks learning how to work on this system.

Why? Because there is enough current in the battery pack to KILL you, and
even some techs have been killed removing the battery from the electrical
circuit!!!

Leave this to a qualifed tachnician.
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