Cisco 8821 Battery CP-BATT-8821

Overview
There are many conditions that can affect the expected performance of your Cisco® Wireless
IP Phone 8821 battery.

Types of work environments
Work environments that use the Cisco Wireless IP Phone 8821 fall into the following general types: Shift workers and Office workers.
Shift workers typically rotate on 8- to 12-hour shifts and do not have a dedicated device. Instead, they hand off the device when a shift change occurs.

These users typically change the battery out with a fresh one during the shift change. Battery multichargers can be used to ensure a supply of fully charged batteries.
Office workers have a dedicated device. These users typically place their device in a charging stand or on a power cord during off hours.

Things to consider for shift workers
If you are a shift worker, it is important to replace the battery with a fully charged one at the start of your shift. This will give the best experience since there

will not be a need to replace the battery mid-shift. It also allows for the spent battery to fully charge for the next shift.

Things to consider for office workers
Desk charging stands have a slot for a spare battery. It can be useful to have a spare battery charging in this slot. That way, if you inadvertently forget to place the phone on the charger,

you will have a fully charged replacement battery on hand.

Battery replacement
After 500 charge cycles, the max voltage drops by 20 percent. This is important for you to know because the battery
will need to be replaced at some point due to this drop in voltage.
Understanding charge cycles
A charge cycle occurs when you discharge a battery by 100 percent of its capacity. This can accumulate over several
charges. As an example, you might use 80 percent of your battery’s capacity one day, then charge it fully overnight.
The next day you could then use 20 percent of its capacity and have reached a single charge cycle of 100 percent.
Every charge does not equate to a charge cycle unless the battery is fully discharged every time that it is charged.