Replacement battery fits 5 Redmond compatible models. Specifications: 2600mAh, 10.8V, Li-ion. Compatible with: RV-R100, Valubot K100, Lefant M501A, Lefant M501B, Lefant M501. Replaces: Redmond SUN-INTE-321, Valubot SUN-INTE-321. Redmond replacement battery designed for Vacuum devices. Tested for reliability and long service life.