274 Maintenance and Battery Replacement
Vertiv™ | Liebert® PSI5 120V Input / 120V Output & 208V lnput / 208V Output Installer/User Guide
4 Maintenance and Battery Replacement
4.1 Precautions
Although the Liebert® PSI5 is designed and manufactured to ensure personal safety, improper use can
result in electrical shock or re. To ensure safety, observe the following precautions:
• Turn o and unplug the UPS before cleaning it.
• Clean the UPS with a dry cloth. Do not use liquid or aerosol cleaners.
• Never block or insert any objects into the ventilation holes or other openings of the UPS.
• Do not place the UPS power cord where it might be damaged.
4.2 Battery Charging
The batteries are valve-regulated, non-spillable, lead-acid in all models except for the LI, which uses
LiFeP04 type lithium-ion batteries. In all cases, the batteries should be kept charged to retain their design
life. The PSI5 charges the batteries continuously when it is connected to input power. If the PSI5 will be
stored for a long time, Vertiv™ recommends connecting the UPS to input power every 4 to 6 months for at
least 2 hours for LI models and 24 hours for lead acid models to ensure full recharge of the batteries.
The Lithium Ion batteries used in the PSI5 LI series, as well as all Vertiv Lithium-Ion UPSs, contain a
Battery Management System (BMS) that self-monitors the safety of the LI batteries in real-time. This is an
agency tested and certied requirement now eliminating the industry wide safety risk known with previous
Li-Ion batteries.
4.3 Replacing the UPS Batteries
IMPORTANT! Before you proceed, please review the battery safety precautions available at https://
www.vertiv.com/ComplianceRegulatoryInfo
You may safely replace the internal battery pack. See the Specications on page 31, for the part number
of the replacement battery for your UPS model number.
NOTE: Replace the battery with the same type and number as originally installed.
NOTE: The internal battery pack is hot-swappable. However, caution should be exercised because
during this procedure the load is unprotected from disturbances and power outages. Do not replace
the battery while the UPS is operating in Battery Mode. This will result in a loss of output power and
will drop the connected load.
To replace the batteries on 1U and 2U models:
1. Remove the front bezel by pulling rmly until the snaps release.
2. Disconnect the battery connector by squeezing the ends and gently pulling the two pieces apart.
3. Remove the two screws and the metal battery cover plate.
4. Slide out the existing battery kit.
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