Replacement battery fits 5 SmartMod compatible models. Specifications: 400mAh, 3.7V, Li-Polymer. Compatible with: Pro Tristar Tester Version2.0, Tristartester SMP-TT2, Tristartester V1, Tristartester V2, Tristartester V3. Replaces: Tristartester 17508. SmartMod replacement battery designed for Equipment/Survey/Test Charger devices. Built to deliver the same performance as the original.