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    Wierdness with Advanced Ultrabay Battery

    Discussion in 'Lenovo' started by Zak Smith, Jul 30, 2007.

  1. Zak Smith

    Zak Smith Notebook Enthusiast

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    I have a Z61t (9440-38U) which has run great for almost a year now. I normally run the flush-fit battery and an Advanced Ultrabay battery to give me the most run-time in the smallest package. Running Linux, I could get 4 hours of runtime with this combination.

    A few weeks ago, I noticed that the Ultrabay battery would drop from approx 45-50% to 5% remaining capacity, instantaneously, ie, bypassing approx half of its alleged capacity. A service call into Lenovo got me a replacement under warranty in 3 days (great job Lenovo!).

    However, after fully charging this new battery, I noticed that it discharged linearly down to 28%, but then even it jumped down to 4% remaining.

    The full cycle count of the original Advanced Ultrabay battery was still less than 20. I set up the battery manager to discharge both the primary and Ultrabay batteries in-step, so that the 2nd battery doesn't "deep cycle" EVERY TIME. (See batteryd.cc on Thinkwiki for more details.)

    Does anyone else see similar behavior with their Advanced Ultrabay batteries?
     
    Zak Smith, Jul 30, 2007
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