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| In this test, I purposely overcharged a stock I-Cybie
800mAH NiCD battery pack for 400 minutes (about 7 hours). At about 3
hours, the pack is fully charged near the peak voltage region. Anything
after that is considered overcharging. During this overcharging phase, the
temperature begins to climb rapidly . It eventually stabilizes to about 50
degrees Celsius. Leaving the pack at this temperature is detrimental to
the pack and will lessen its total life cycle. Notice also how the pack
voltage begins to drop during this overcharge region. It eventually
stabilizes to about 14.5 volts. Overcharging a pack at a faster charge rate can have much more detrimental effects because pressure can build up rapidly inside of the cells. Normally, safety vents built into the cells open up to release this pressure. In the worst case scenario, a vent may fail to open and a cell could "rupture". |
