- #42 of 669
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Re: 8 year battery???? [gagrice]
by rfruth
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Jul 24, 2004 (4:25 pm)
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Replying to: gagrice (Jul 24, 2004 3:45 pm)
Of corse nothing manages the batteries like a hybrid or costs like one either. Maybe if a cordless phone was $ 500.00 the battery would be managed better heck some $ 200.00 bicycle lightning systems that use Ni-MH batteries come with dumb chargers (they don't check the temp of the battery or for any existing charge, plug it in and the charger goes full tilt boogie even if it means cooking the battery) - but as you know auto manufacturers would offer zero warranty if they could, why risk warranty claims, for return business ?
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- #43 of 669
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Re: 8 year battery???? [rfruth]
by gagrice
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Jul 24, 2004 (4:32 pm)
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Replying to: rfruth (Jul 24, 2004 4:25 pm)
If I put 150k on a vehicle in under 8 years I would have no problem buying a Hybrid. Just get rid of it before the warranty is up. If batteries don't get hot in the charging stage and are not let go all the way down, they should last a good long time. I have a Dell Inspiron 7000 that is 5 years old and the battery is still good. I have a one year old Inspiron 4100 that won't run 15 minutes on the battery.
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- #44 of 669
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Re: 8 year battery???? [rfruth]
by gagrice
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Jul 24, 2004 (4:34 pm)
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Replying to: rfruth (Jul 24, 2004 4:25 pm)
On dumb chargers. I just changed the battery in a year old Panasonic cordless. It was Nicad and one cell would not hold a charge for more than a few minutes.
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- #45 of 669
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Re: 8 year battery???? [gagrice]
by john1701a
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Jul 24, 2004 (5:14 pm)
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Replying to: gagrice (Jul 24, 2004 3:45 pm)
Poor charge management is why most rechargable batteries suffer shortened life.
If your cell-phone shutdown at 40% and refused to power back up until you plugged it in, the battery would last dramatically longer. But instead, users drain the thing to totally dead on a regular basis. That's a huge difference from the way a system like HSD in Prius works.
JOHN
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- #46 of 669
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Re: 8 year battery???? [gagrice]
by john1701a
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Jul 24, 2004 (5:19 pm)
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Replying to: gagrice (Jul 24, 2004 4:34 pm)
NiCd rechargable batteries were inherently problematic. They suffered from memory-effect, were environmentally dangerous, and they could hold not as much power as NiMH. That's why NiCd is considered long outdated technology.
JOHN
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- #47 of 669
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Re: 8 year battery???? [gagrice]
by john1701a
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Jul 24, 2004 (7:06 pm)
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Replying to: gagrice (Jul 24, 2004 4:34 pm)
Another common hybrid battery misconception is that all the electricity feeding the motor comes from the battery-pack.
While that is true for a "mild" hybrid, it is not for a "full" hybrid like Prius. In fact, 100% of the time the engine is providing thrust to the wheels it is also powering the generator-motor. The resulting electricity is immediately used by the thrust-motor.
Preventing the battery-pack from being used as much obviously helps to extend the life of it.
JOHN
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- #48 of 669
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Re: 8 year battery???? [john1701a]
by gagrice
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Jul 25, 2004 (7:30 am)
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Replying to: john1701a (Jul 24, 2004 7:06 pm)
Question, I read an article that says the hybrid batteries are only charged by the regenerative action of slowing and braking. The writer said this caused problems on long uphill grades on a cross country test run. Is that true?
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- #49 of 669
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Re: 8 year battery???? [gagrice]
by usbseawolf2000
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Jul 25, 2004 (7:16 pm)
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Replying to: gagrice (Jul 25, 2004 7:30 am)
Becareful when someone use a general word "hybrid" since not all design were created equal. HSD can split power from ICE to generate electricity while climbing hills, assuming the hill is not steep enough to have spare power from the ICE.
04 Prius battery ECU will not let the battery discharge below 40% SOC. The rest of 60% of the 1.31 kWH battery can provide 28 hp for 135 seconds. If you climb the hill at 60mph and the hill is so steep that the battery provides all 28hp for 135 seconds, Prius can trouble 2.25 miles before the battery SOC get to 40%. It is when the turtle icon appears.
If the hill is not as steep and Prius main ECU request only 14hp from the battery, Prius can go up 4.5 mile long hill. That's a very long hill!
I know you had bad experience with batteries. Let me give you another graph which shows the Cylinder D-shape batteries(Used in Japanese Prius) and Prismatic batteries(Used in US Classic Prius). They tested over 180,000 miles for Cylinder and 150,000 miles for Prismatic. Note that 04 Prius batteries has less Internal Resistence than last generation Prismatic modules. Basically, these batteries can keep going and going and going .....
Dennis
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- #50 of 669
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Re: 8 year battery???? [usbseawolf2000]
by gagrice
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Jul 25, 2004 (8:39 pm)
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Replying to: usbseawolf2000 (Jul 25, 2004 7:16 pm)
That makes sense and goes along with what the writer was saying about the Prius. They were in the Rockies and he was trying to pass on a long uphill stretch. He could not feel the electric motor kicking in. He probably already discharged to the 40% level. So it was just the ICE which was not enough power to go around. I am not sure how fast he was going. I can't find the article now. I doubt it is that important. I am sure that the hybrid has forced vast improvements in battery technology. The last of the electric cars were also instrumental in improving NiMH batteries. I hope they are as long lived as Toyota is predicting. Thanks Dennis
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- #51 of 669
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Re Improvements in battery tech
by stevedebi
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Jul 26, 2004 (9:10 am)
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No, the Prius doesn't push the envelope in battery technology; it just makes sure the batteries don't get over charged or fully depleted. Nothing new there.
It uses the plain old batteries, several years old technology...
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