Sealed Lead Acid battery with 2 contacts on top. 6 Volt SLA UPS Battery. Fits models; APC 450AT, APC 450AT+, APC 520ES, APC 550ES, APC AP450, APC AP520, APC AP800, APC AP800RT, APC BackUPS 650, APC BackUPS 900, APC Network Powercell BD, APC Powercell...
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