4-Pack UB645 Replacement Batteries for Dual Lite 3901 — 6V 4.5Ah (4500mAh) SLA/AGM, F1 Terminals + 8 F1→F2 Adapters — UpStart Battery

UpStart Battery brand replacement set designed for Dual Lite 3901 (UB645) applications. This pack includes four sealed lead acid (SLA) AGM batteries, each rated 6V and 4.5Ah (4500mAh), with F1 terminals for direct fit. Also supplied are 8 F1 to F2 terminal adapters to accommodate alternate connector types. These maintenance-free UB645 replacements deliver the same electrical specifications as the original Dual Lite 3901 units and are ready for use in compatible equipment.