Compaq Lithium-ion battery - Manual (Page 4)

Warranty period
HP provides a 12-month warranty for Li-Ion batteries. The warranty period is based upon the
expectation that the battery will deliver 80% of its initial capacity after 300 cycles at low to moderate
power loads. High power loads may cause a battery to reach 80% of initial capacity in less than the
12-month warranty period. Li-Ion batteries will continue to operate below the 80% capacity threshold;
however, the capacity (run time) delivered between charges will continue to decrease.
Table 1 summarizes FCC projections after one year based on 2 user profiles and various power
loads. The first profile is for a mobile user who fully discharges and charges the battery almost every
working day (300 cycles per year) in a normal environment. The second profile is for a stationary
user who only cycles the battery once per week in a high-temperature environment, such as in a
docking station. As shown in the table, the additional heat generated by running high power
applications or by using a docking station accelerates the loss of capacity.
Table 1. Full charge capacity projections after one year of use
Full charge capacity (% of initial capacity) after one year Power load (applications)
Mobile user
Battery cycled daily (25ºC, 77ºF)
Stationary user (with docking station)
Battery cycled weekly (>35ºC, 95ºF)
Low (word processing, Internet, e-mail) >80% 80%
Moderate (wireless, spreadsheets,
database management) 80% 70%
High* (CAD, 3D games, DVDs, high
LCD brightness) 60% 50%
*High power applications may also reduce the battery cycle life by as much as 25%.
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