Ametek 420VA Manual page 22

User Replaceable Battery (Non-medical units only)
Eventually every UPM requires a new battery. AMETEK-Powervar
expects the battery in your UPM to last a minimum of two years –
perhaps longer if power outages are short and infrequent. The UPM
makes battery replacement by the user fast and easy. It is not necessary
to turn off the UPM or the connected system. The UPM allows the battery
to be "hot-swapped" while the system is running.
NOTE:
Changing the batteries in this UPM is designed to be a safe and
simple procedure. Batteries may be replaced while the UPM is on
and providing power to the connected load. You should remember,
however, that if a power outage occurs after the old batteries are
disconnected and before the new batteries are installed, power will
be lost to your connected system and components.
RISK OF EXPLOSION IF BATTERY IS REPLACED BY INCORRECT TYPE.
When replacing batteries, contact Powervar for correct battery
replacement kits. Reference replacemen kit part numbers below.
22
CAUTION
VA Rating
420
600/800
1100/1440
Replacement Battery
Kit Part No.
50842-01
50880-01
50814-01
A01-00055 Rev G