Battery; Coin-Cell Battery - Dell Alienware Series Manual

Battery

Batteries are classified by their power ratings, such as 45 WHr, 65 WHr, and so on. The battery allows you to use your device when it is not
connected to a power outlet. The life cycle of the battery is the number of times it can be discharged and recharged without affecting the
operating time significantly. After the battery life-cycle reaches its end of life, you must replace the battery. Depending on the computer
model, the battery on your computer may be user-replaceable or may require a Dell service technician to replace.
NOTE: High-capacity batteries generally have a longer life-cycle, since you need to charge high-capacity batteries less often
compared to low capacity batteries.
NOTE: For tips on improving the battery life, see

Coin-cell battery

Coin-cell battery provides power to the Complementary Metal‑Oxide Semiconductor (CMOS) chip while the computer is turned off. The
CMOS chip contains the time, date, and other configuration information about your computer. Under normal usage conditions, the coin-cell
battery can last for several years. Factors affecting the coin‑cell battery life are the type of system board, temperature, the time for which
the computer is powered off, and so on.
16 About your computer
Improving battery life.