Falcon SSG1.5KRM-1 Owner's Operating Manual page 8

7) Never Apply a Short Circuit Across The Batteries as Personnel Injury, Fire or Explosion May
Result.
8) DANGER ---- NEVER ATTEMPT TO CONNECT AN EXTENDED BATTERY BANK
CONTAINING VRLA LEAD-ACID BATTERIES TO A UPS CONTAINING INTERNAL
LITHIUM-ION-PHOSPHATE BATTERIES.
8