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Figure 1 illustrates the capacity drop of 11 Li-polymer batteries that have been cycled at a Cadex laboratory.
The 1,500m Ah pouch cells for mobile phones were first charged at a current of 1,500m A (1C) to 4.20V/cell and then allowed to saturate to 0.05C (75m A) as part of the full charge saturation.
The tables do not address ultra-fast charging and high load discharges that will shorten battery life. Table 2 estimates the number of discharge/charge cycles Li-ion can deliver at various Do D levels before the battery capacity drops to 70 percent.In lieu of cycle count, some device manufacturers suggest battery replacement on a date stamp, but this method does not take usage into account.A battery may fail within the allotted time due to heavy use or unfavorable temperature conditions; however, most packs last considerably longer than what the stamp indicates.The batteries were then discharged at 1,500m A to 3.0V/cell, and the cycle was repeated.The expected capacity loss of Li-ion batteries was uniform over the delivered 250 cycles and the batteries performed as expected. Eleven new Li-ion were tested on a Cadex C7400 battery analyzer.