Tutorial for accessing and connecting the battery within APC Back-UPS M series UPS models during initial setup (BE425M/BN450M, BE600M1/BN650M1, BE850M2/BN900M) . This procedure can also be used for guidance on replacing a battery if the UPS indicates this is necessary. The batteries ship disconnected per US DOT regulations. To learn more, please visit the APC by Schneider Electric FAQ: http://www.apc.com/us/en/faqs/FA330568/