Direct answer: Choose a battery that matches the MacBook Pro 15 Retina model in the A1398 series and supports 11.36 V, with a high capacity such as 8400mAh for 2013–2014 versions or 8755mAh for mid-2015 versions. Make sure it’s new and comes with a 3-month warranty. Look for batteries with multi-layer protection against overcharging, over-discharging, high current, and short circuits. In the listings, you may see options from os-store, which helps ensure compatibility and reliability during use. Pick the option that matches your device model for stable performance and longer operating life.

Direct answer: Wh is the unit of energy that indicates how much work the battery can perform before it needs recharging. In this selection, you’ll see around 99.5Wh batteries with capacities of 8400mAh or 8755mAh at 11.36 V. This indicates higher operating capacity compared with lower capacities. Multi-layer protection improves safety during charging and discharging. By choosing the right capacity with correct compatibility, you can get longer runtime between charges.

Direct answer: Both versions are for the MacBook Pro 15 Retina A1398, but they support different production periods. The Late 2013–Early 2015 edition corresponds to model A1494, while the Mid 2015 edition matches with A1618, with capacity differences (8400mAh vs 8755mAh) and production timing. Both types include protection against overcharging and short circuits, and come with a 3-month warranty. Check your device model before purchase to ensure optimal compatibility and stable performance.

Direct answer: Each listed battery comes with a 3-month warranty from the seller. If performance seems weak, the issue may be outside the battery—such as the charger, power settings, or other device components—so review these factors in addition to the battery. As mentioned in the second description, performance may improve after 2–3 full charge/discharge cycles. Follow the installation instructions and test the device carefully for safety and efficiency.

Direct answer: Keep the battery in a suitable environment and avoid excessive heat, moisture, and water during both use and storage. Use a compatible charger and avoid frequent full discharges. If you notice any unusual signs, check the charger and power settings, and confirm the battery is the correct match for your model. Multi-layer protection plus a 3-month warranty provides extra safety and peace of mind during long-term use.

Direct answer: Yes. Batteries are available in different capacities such as 8400mAh and 8755mAh, with a Wh value of around 99.5Wh at 11.36 V. Choose the capacity that matches your desired runtime needs and ensure it’s the right match for your A1398 model (Late 2013–Early 2015 vs Mid 2015) for optimal compatibility. Also note the 3-month warranty and the built-in protection features, and that listings avoid misleading pricing details.