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Pismo battery(s) dying

Message #1 - Posted 2004/08/01 - IRO

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

Actually, I just had a thought.....what if a 12v lead-acid gel cell was packed into an appropriate case and fitted into the Pismo's carry bag. Might require an adjustable regulator to tweak the voltage to Pismo's 10.8V. Scavenge a cable from a dead PSU to get the right plug.

Might just work.....

------
~IRO
My ambition in Life is to build something that will
REALLY last....at least until I've finished building it.

Message #2 - Posted 2004/08/02 - Joel Farris

IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

Actually, I just had a thought.....what if a 12v lead-acid gel cell was packed into an appropriate case and fitted into the Pismo's carry bag. Might require an adjustable regulator to tweak the voltage to Pismo's 10.8V. Scavenge a cable from a dead PSU to get the right plug.

Might just work.....

I sure wish I knew something about battery design. I want the same thing you're talking about, but I can't build it myself

Joel Farris | Q: It reverses the logical flow of conversation. twinkledust Designs | A: Why is top posting frowned upon? http://twinkledust.com| AIM chat: FarrisJoel | "John Kerry: A walking, talking contradiction"

Message #3 - Posted 2004/08/02 - Paul Fuchs

Joel Farris wrote:

IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

Actually, I just had a thought.....what if a 12v lead-acid gel cell was packed into an appropriate case and fitted into the Pismo's carry bag. Might require an adjustable regulator to tweak the voltage to Pismo's 10.8V. Scavenge a cable from a dead PSU to get the right plug.

Might just work.....

I sure wish I knew something about battery design. I want the same thing you're talking about, but I can't build it myself

I have a 12 v deep cycle lead acid batery on my boat and run my Pismo off of it - works like a charm. Only problem is that it weighs 47 lbs. --
Paul Fuchs
paulfuchs-at-attglobal-dot-net
Sitting on a small rock (St. John) in the Caribbean

Message #4 - Posted 2004/08/03 - Ron Parsons

Previously, Paul Fuchs wrote:

Joel Farris wrote:

IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

Actually, I just had a thought.....what if a 12v lead-acid gel cell was packed into an appropriate case and fitted into the Pismo's carry bag. Might require an adjustable regulator to tweak the voltage to Pismo's 10.8V. Scavenge a cable from a dead PSU to get the right plug.

Might just work.....

I sure wish I knew something about battery design. I want the same thing you're talking about, but I can't build it myself

I have a 12 v deep cycle lead acid batery on my boat and run my Pismo off of it - works like a charm. Only problem is that it weighs 47 lbs.

I have a Pismo compact charger/power supply for auto or airplane use. Such a device would simplify your connection.

Ron Parsons

Message #5 - Posted 2004/08/03 - John Johnson

Previously, IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

The only commercially available batteries for your Pismo are the Li-ion units. As you say, their cycle life is limited to something like 500-1000 cycles (partial cycles count as partial cycles, not full ones). I find my Pismo batteries are just fine. the original lasted me 3 years, my new one (made by BTI, purchased from CDW-not the cheapest place around) is 1.5 years old.

I'll grant you your pricing sucks because of the shipping and exchange rates, but disagree with your assessment of the quality of the battery.

HTH

Later,
John

johajohn@indianahoosiers.edu

'indiana' is a noun. Leave only the noun between @ and .edu to reply

Message #6 - Posted 2004/08/03 - Pat Janes

Previously, IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

I've recently picked up a Pismo battery (5400 mAh) that's marketed by BTI. I ran it into the ground at slightly more than 4 hours of usage.

NewerTech also sells a couple of different Pismo batteries, a 4800 mAh and a 6600 mAh.

The original Apple battery is (IIRC) 4800 mAh.

Message #7 - Posted 2004/08/04 - Eric Johnson

On 04-08-2004 00:53, in article null-F1EE7F.17535703082004@newsclstr01.news.prodigy.com, John Johnson wrote:

Previously, IRO wrote:

One is on its last legs, the other only OK. Replacements look like costing around US$100 equals over NZ$200 by the time I get screwed for freight. Add to that the thought that Li-Ion cells are no famous for their recharge cycle capacity.

Are there any alternatives or have Apple locked us into buying the damn things?

The only commercially available batteries for your Pismo are the Li-ion units. As you say, their cycle life is limited to something like 500-1000 cycles (partial cycles count as partial cycles, not full ones). I find my Pismo batteries are just fine. the original lasted me 3 years, my new one (made by BTI, purchased from CDW-not the cheapest place around) is 1.5 years old.

I'll grant you your pricing sucks because of the shipping and exchange rates, but disagree with your assessment of the quality of the battery.

HTH

I agree, my pismo battery lasted 4 years.

ej

Message #8 - Posted 2004/08/04 - IRO

Previously, Joel Farris wrote:

Actually, I just had a thought.....what if a 12v lead-acid gel cell was packed into an appropriate case and fitted into the Pismo's carry bag. Might require an adjustable regulator to tweak the voltage to Pismo's 10.8V. Scavenge a cable from a dead PSU to get the right plug.

Might just work.....

I sure wish I knew something about battery design. I want the same thing you're talking about, but I can't build it myself

Whoops! make that 24V input for the Pismo PSU.

------
~IRO
My ambition in Life is to build something that will
REALLY last....at least until I've finished building it.

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