Specifications, Battery life and data retention time

Specifications

The following table provides specifications of the ThinkServer 8708EM2 RAID Battery.

Battery technology	LiON

Battery operating temperature (ambient)	10 to 40°C (50 to 104°F)

Humidity (storage and operating)	20%-80% (non-condensing) (ThinkServer 8708EM2 RAID
	Battery)

Battery storage temperature	•	< 30 days: 0 to 50°C (32 to 122°F)
	•	30-90 days: 0 to 40°C (32 to 104°F)
	•	> 90 days: 0 to 30°C (32 to 86°F)

Battery voltage conditioning	<3.7 V

Fast charge rate	500 mAh

Battery pack	1 cell

Mechanical	2.61 inches x 2.122 inches

Battery capacity	700 mAh

Charge circuitry card	Yes

Battery charge time	4 hours

Auxiliary power	Yes

This sections includes information about the battery life and data retention time.

It is recommended that you replace the battery pack on the battery card assembly once a year or after 500 recharging cycles, whichever comes first.

The data retention time for the battery card assembly is as follows:

BBU name	Data retention time

ThinkServer 8708EM2 RAID Battery (iBBU06)	72 hours for 256 Mbytes, using three 64 Mx16 DDR2
	DRAMs (low power)

The data retention time varies according to the following:

•Capacity of the battery pack and the battery load

•Ambient temperature

•Age of the battery

•Numbers of discharge cycles the battery has been through

•DRAM (dynamic random access memory) size