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PowerShield's replacement battery is the 12V 9Ah PSB12-9, with the PSB12-9-10YR (10-year design life) suitable for all PowerShield lead-acid UPSs. Commander RT and Centurion RT models use clamshell cartridges: PSBC2 (Commander RT 1100), PSBC3 (Centurion RT 1000 and 1500), PSBC4 (Commander RT 2000 and Centurion RT 2000 Short Base) and PSBC6 (Centurion RT 3000).

External battery modules extend runtime: PSRTBB6 (Centurion RT 1000), PSRTBB8 (Commander RT 2000, Centurion RT 2000 Short Base), PSRTBB12 (Commander RT 3000, Centurion RT 2000/3000), PSRTBB16 and the 3U PSCERBB20 (Centurion RT 6000L and 10KL).

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