LEGRAND NUMERIC HPi 33 EVO User Manual page 13

External battery connections for long-run units.
CAUTION!
Ensure correct polarity battery string series connection. I.e. inter-tier and inter block connections are from (+) to
(-) terminals.
Don't mix batteries with different capacity or different brands, or even mix up new and old batteries, either.
WARNING!
Ensure correct polarity of string end connections to the Battery Circuit Breaker and from the Battery Circuit Breaker
to the UPS terminals i.e. (+) to (+) / (-) to (-) but disconnect one or more battery cell links in each tier. Do not
reconnect these links and do not close the battery circuit breaker unless authorized by the commissioning engineer.
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