⚡【FOR COMPATIBLE MODEL】⚡★REAL 205mAh, SAME AS ORIGINAL CAPACITY.★ Please verify your old battery part number and model before purchasing this replacement battery. Compatible with Watch Series 1 38mm A1578 A1802 A1553 (1st generation) (Watch Sport, Watch Edition, Watch Hermès compatible also). | ⚡【FOR BEST PERFORMANCE】⚡Please use your original charger and cable which came with your watch to charge this battery. Using up all the power of watch series 1 battery 38mm for the first three times before charging, and then take a full charge, thus the battery can be reached the optimum effect of using. Please remember that its full performance and longevity is only achieved after 3 to 5 complete charge and discharge cycles. | ⚡【HIGH CAPACITY BATTERY】⚡ASDAWN series 1 38mm battery is made of high quality Li-Polymer battery cell, the advanced technology makes this replacement battery capacity up to 205mAh and provides you a high-speed and efficient charging. Up to 48 hours of long lasting time, bring your battery's life back to glory and save the money. Choose ASDAWN battery restore your watch to like new performance! | ⚡【STRICTLY DOUBLE TESTED】⚡Our battery uses Grade A rated battery cells ensure longer battery life (500 cycles) and high-speed, efficient charging. Every series 1 38mm battery is manufactured and tested under strict quality control standards. Build-in microchip to prevent over-charging, over-discharging, short-circuit and over-heating. Voltage protection and current protection for safer operation for both user and devices. | ⚡【WORRY-FREE WARRANTY】⚡60 DAYS MONEY BACK and 12 MONTHS WARRANTY. We take care of all quality-related issues with a REPLACEMENT or REFUND. ASDAWN cares every customers, your satisfaction is always our business goal. ★Please do not hesitate to contact us if there's anything on your mind: Click on “ASDAWN Trade” next to “Sold by”, then click on “Ask a question” to contact us. ASDAWN team will do whatever they can to help you.★