6.4V, 6000mAh, Li-ion Battery fits Welch-allyn, 4200b-e1, 420tb-e1, 38.4WhBattery Fits Models: 4200b e1, 420tb e1, 42m0b e1, 42mtb e1, 42n0b e1, 42ntb e1, Spot Vital Signs Monitor Battery Part Numbers: 105631 If you are worried about the quality or the performance of the products from Cameronsino, take a look at the reviews from our customers. Sound quality is assured as the products are manufactured to a very high standard The replacement battery listed here is developed using the highest quality components. Battery