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Safety Considerations
Batteries: Safe Handling and Disposal
Overtemperature Charging: The system microcontroller prevents the battery
from being charged if the cell temperature exceeds 46C. Once the
overtemperature charging protection is tripped, the cell temperature has to
drop to or below 45C to reset the protection and permit charging.
Overtemperature Discharging: The system microcontroller prevents the
battery from being discharged if the cell temperature exceeds 65C. Once the
overtemperature discharging protection is tripped, the battery is automatically
shut off which results in turning off the instrument as well.
Passive Protection
Reverse Charging: A reverse protection diode prevents against damage or lost
data due to a reverse charge polarity applied to the battery terminals.
Primary Overtemperature: A PTC (positive temperature coefficient) polyfuse in
series between the Li-ion cells and the charging and discharging transistors
will open up and limit current flow to the battery terminals as a function of very
high currents. This protection is resettable once the overstress condition is
removed.
Secondary Overtemperature: A second PTC polyfuse built into each Li-ion cell
will open up and limit current flow as a function of very high currents.
Tertiary Overtemperature: A current interrupt device (CID) within each Li-ion
cell will permanently open up when an individual cell's internal pressure is too
high. As each cell fuse is permanently interrupted, overall battery performance
will become severely degraded, up to and including disabling the battery.
Overcurrent Fuse: This is a one-time blow fuse with a rated current of 12A.
Batteries: Safe Handling and Disposal
Refer to battery manufacture Safety Data Sheet (SDS) for safe handling and
disposal information. Battery SDS's are located at:
https://regulations.about.keysight.com/msds/default.htm
Battery Transportation
Batteries are generally subject to transportation regulations, refer to the
battery Safety Data Sheet (SDS) and contact your shipping department for
transportation requirements.
Keysight N9915-90020 User's Guide
855
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