Battery Protective Functions; Active Protection - Keysight N9912A User Manual

Safety Considerations

Battery Protective Functions

Battery Protective Functions
The following protective functions are designed into the lithium-ion
rechargeable battery system used in FieldFox.
The protective functions can be divided between two categories: active and
passive. Active protection refers to the type of protection that depends on at
least two or more protection devices working together to enable the protection
Passive protection refers to the type of protection that is always enabled
independent of any other protection device.

Active Protection

Primary Overcharge Voltage: This prevents the battery from being charged if
the voltage across any cell exceeds approximately 4.35 V per cell. Once the
overcharge protection is tripped, the voltage across each cell must drop below
approximately 4.15 V to reset the protection and permit charging.
Keysight N9912-90001 User's Guide
Do not disassemble or modify the battery. The battery contains
safety and protection devices, which if damaged, may cause the
battery to generate heat, explode, or ignite.
Do not place the battery in direct sunlight, or use or store the
battery inside cars in hot weather. Doing so may cause the battery
to generate heat, explode, or ignite. Using the battery in this
manner may also result in a loss of performance and a shortened
life expectancy.
There is a danger of explosion if the battery is incorrectly replaced.
Replace only with the same or equivalent type of battery
recommended. Discard used batteries according to manufacturer's
instructions.
If you are charging the batteries internally, even while the FieldFox
is powered off, the FieldFox may become warm. Allow for proper
ventilation.
Do not discharge the battery using any device except the FieldFox
or the external battery charger (N9910X–872). When the battery is
used in a device other than those specified, it may damage the
battery or reduce its life expectancy. If the device causes an
abnormal current to flow, it may cause the battery to become hot,
explode, or ignite and cause serious injury.
For a Korean battery safety consideration translation, refer to
Appendix D:, "Korean Battery Safety Translation."
21- 7