5-Pack UB645 Replacement for Sentry Lite 640 — UpStart Battery Brand 6V 4.5Ah (4500mAh) SLA/AGM with F1 Terminals + 10 F1→F2 Adapters

Five replacement UB645 sealed lead acid batteries from UpStart Battery Brand, compatible with Sentry Lite 640 units. Each battery is rated 6V, 4.5Ah (4500mAh) and uses F1 terminals. These are AGM/SLA type batteries designed as direct replacements for UB645 universal sealed lead acid batteries. The set includes 10 F1 to F2 terminal adapters for added installation flexibility.