1. brian51's Avatar
    Hi,just bought a second hand 9500 today but the battery doesnt seem to be charging.I have checked loads of forums about taking battery out and inserting again.I also found some info which may be of help to others and is posted below.
    If the battery is of an age or has been totally discharged lots of times the battery in out trick may not work as the battery will be goosed.Time for a new battery I guess and hope that works.Hope this helps people understand the battery a little better and how to prolong its life.


    How to prolong lithium-based batteries

    Battery research is focusing heavily on lithium chemistries, so much so that one could presume that all future batteries will be lithium systems. In many ways, the Lithium-ion (Li-ion) is superior to nickel and lead-based chemistries.

    A Li-ion battery provides 300 to 500 discharge/charge cycles or two to three years of service from the time of manufacturing. The loss of battery capacity occurs gradually and often without the knowledge of the user. There are no remedies to restore Li-ion batteries when worn out.

    Li-ion prefers a partial rather than a full discharge. Avoid depleting the battery fully too frequently. Instead, charge more often or use a larger battery. There is no memory to worry about.

    Although lithium-ion is memory-free in terms of performance deterioration, engineers often refer to "digital memory" on batteries with fuel gauges. Repeat small discharges with subsequent charges do not allow the calibration needed to track the chemical battery with the fuel gauge. A deliberate full discharge with recharge every 30 charges, or so, will correct this problem. Letting the battery run down in the equipment to the cut-off point will do this. If not done, the fuel gauge becomes increasingly less accurate.

    The aspect of aging is an issue that is often ignored. A time clock starts ticking as soon as the battery leaves the factory. The electrolyte slowly 'eats up' the positive plate, causing the internal resistance to increase. Eventually, the cell resistance reaches a point where the battery can no longer deliver energy, although the battery may still contain charge.

    The speed by which Li-ion ages is governed by temperature and state-of-charge. The most harmful combination is full charge and high temperature. If possible, store the battery in a cool place at a 40% charge level. Figure 1 illustrates the capacity loss as a function temperature and charge level.


    Figure 1: Permanent capacity loss of Li-ion as a function of temperature and charge level.
    High charge levels and elevated temperatures hasten the capacity loss. Improvements in chemistry have increased the storage performance of some Li-ion batteries.
    sedalia066 likes this.
    06-15-11 02:40 PM
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