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New Larger Battery for Sagers - Page 4

Poll Results: What option do you like in regards to a new larger battery?

This is a multiple choice poll
  • 5% (7)
    The current batteries are fine
  • 37% (51)
    I'd like a larger main battery (7-8000+mah) to be available
  • 4% (6)
    If yes to #2, this battery should be made standard with an increase in price
  • 30% (42)
    If yes to #2, this battery should be an optional upgrade while ordering
  • 22% (31)
    If yes to #2, this battery should be available to 56xx owners to upgrade to, post ordering
137 Total Votes  
post #61 of 62
10/3/03 at 11:12am
Quote:
Originally posted by NightShade737
NiMH wouldnt be a good idea as while the battery life decreases the output voltage also decreases meaning that there may not be enough power to drive the laptop after a short amount of time, or you may start getting side effects.

NS
But that happens with Lithium Ion batteries, Nicads, Lead Acid...

It will charge up to a proper voltage, but then run for 20 minutes and drop to below nominal very quickly.

Nihms are easily recoverable, you can recondition them often, and zap them to break up internal shorts (quick charge of unfiltered 12volts for 1-2seconds)

Lithium Ion batts are also not very suited to high current draw, hence you would have to design the battery to prevent overloading cells (at least). The capacity of a LiIon increases when discharge current decreases.
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post #62 of 62
10/3/03 at 11:22am
Quote:
Originally posted by JeffL
But that happens with Lithium Ion batteries, Nicads, Lead Acid...
Actually that isn't true. NiMH's voltage slowly decreases along with its charge, where as NiCADs hold the same voltage then drop off very fast.

Not sure about LiONs though.

Very rough visual description attached. Note that NiMH are normally higher mAh than NiCADs though. (ill post it when I get home)

NS
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