HP LH4r HP NetRAID-4M Installation Guide - Page 83

Understanding The Battery Subsystem

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8 Understanding The Battery Subsystem For information about... Initial Battery Charge Battery Low Conditions Battery Reconditioning Recovering Data from the Controller's Cache Turn to... page 8-2 page 8-2 page 8-3 page 8-4 The HP NetRAID-4M controller contains a pair of replaceable nickel-metal hydride (NiMH) batteries and associated charging/monitoring circuitry designed to preserve the contents of its non-volatile cache memory in the event of a power loss or extended power-off conditions. Power loss can occur due to sudden interruption of power to the server; extended power-off situations can occur during system maintenance, hardware upgrades, etc. This battery holdover time is dependent on the batteries' charge level and age, and the size of the DIMM. For a list of battery holdover times, see Appendix E, Specifications. The controller keeps its batteries fully charged by applying a small trickle charge to the batteries during normal operation. If the controller's monitoring circuits determine that the batteries are less than fully charged, it automatically activates the fast charger. The fast charger continues charging the batteries until they reach their 8-1

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8-1
8
Understanding The Battery
Subsystem
The HP NetRAID-4M controller contains a pair of replaceable
nickel-metal hydride (NiMH) batteries and associated
charging/monitoring circuitry designed to preserve the contents of
its non-volatile cache memory in the event of a power loss or
extended power-off conditions. Power loss can occur due to sudden
interruption of power to the server; extended power-off situations
can occur during system maintenance, hardware upgrades, etc.
This battery holdover time is dependent on the batteries
’
charge
level and age, and the size of the DIMM. For a list of battery
holdover times, see Appendix E,
Specifications
.
The controller keeps its batteries fully charged by applying a small
trickle charge to the batteries during normal operation. If the
controller
’
s monitoring circuits determine that the batteries are less
than fully charged, it automatically activates the fast charger. The
fast charger continues charging the batteries until they reach their
For information about...
Turn to...
Initial Battery Charge
page 8-2
Battery Low Conditions
page 8-2
Battery Reconditioning
page 8-3
Recovering Data from the Controller
’
s Cache
page 8-4