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The voltages of lithium iron phosphate and lithium titanate are lower and do not apply to the voltage references given.
Tables 2, 3 and 4 indicate general aging trends of common cobalt-based Li-ion batteries on depth-of-discharge, temperature and charge levels, Table 6 further looks at capacity loss when operating within given and discharge bandwidths.
Today, Li-ion meets the expectations of most consumer devices but applications for the EV need further development before this power source will become the accepted norm.
Notable advancements have been made in longevity and safety while the capacity is increasing incrementally.
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 performance of a battery is measured in capacity, a leading health indicator.
Evaluating battery life on counting cycles is not conclusive because a discharge may vary in depth and there are no clearly defined standards of what constitutes a cycle (see BU-501: Basics About Discharging).
In lieu of cycle count, some device manufacturers suggest battery replacement on a date stamp, but this method does not take usage into account.
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.