Replacement battery fits 11 Globalstar compatible models. Specifications: 1800mAh, 3.7V, Li-ion. Compatible with: i.Trek M3 BT GPS, BT-338, BT-318, BT-318X, BT-335, BT-821 and 5 more compatible models. Replaces: Globalstar NTA2236, i.Trek NTA2236, i.Trek LIN302, Royaltek NTA2236, GNS NTA2236. Globalstar replacement battery designed for GPS/Navigator devices. Designed for long-lasting power.