By mary lv [ 29/12/2007 ]
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Why are excessive quantities of batteries being returned under warranty?
Why are excessive quantities of batteries being returned under warranty?
In an earlier chapter, the question "Why are excessive quantities of batteries being returned under warranty?" was raised. This question has not been fully answered. It appears that all battery chemistries are represented among the packs being returned. It is unclear whether these batteries are inoperable as claimed. Perhaps the liberal warranty return offered by dealers provides an opportunity to acquire a new, and seemingly better, battery without charge. Some misuse of the warranty policy cannot be fully dismissed.
The internal protection circuit of lithium-based batteries may be the cause of some problems. For safety reasons, many of these batteries do not allow a recharge if the battery has been discharged below 2.5V/cell. If discharged close to 2.5V and the battery is not recharged for a while, self-discharge further discharges the pack below the 2.5V level. If, at this time, the battery is put into the charger, nothing may happen. The battery appears to have an open circuit and the user consequently demands a replacement.
Cadex has received a large number of supposedly dead Li-ion polymer batteries from various manufacturers. When measured, these batteries had no voltage at the terminals and appeared to be dead. Charging the packs in their respective chargers was unsuccessful. But after waking up the battery’s control circuit with the 'Boost' function of the Cadex 7000 Series battery analyzer, most of these batteries accepted normal charge. After a full charge, the performance was checked. Almost all packs reached capacities of 80 percent and higher and the batteries were returned to service.
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