Trusted NP2.8-6 GENESIS® | Power Storage Solutions
Amazon.com: NPP NP6-2.8Ah (F1, 2 Pcs) Rechargeable Sealed Lead Acid 6V 2.8Ah Battery for Attendance Machine, Security Alarm System and Mini Instrument : Health & Household
6SB2.8P Drypower 6V 2.8Ah Backup & Main Power Battery - Drypower