Hausbel 3.7v 2600mAh Li-ion Rechargeable Replacement Battery for Samsung Galaxy S4 i9500 / M919 / i337 (Pack of 2 - Non-Retail Packaging) (Galaxy S4) Package Includes: 2 x Battery Best replacement for the original battery with comparable standby and talk time. This replacement battery has an integrated microchip that prevents overcharging and lengthens battery life. It is recommended to fully drain and fully charge the battery especially during the first 3 charging and discharging cycles, doing so may greatly improve the overall life of the battery Great bargain with excellent quality guaranteed!