Replacement Battery For Redmi K30 BM4U Please double check to make sure the battery matches your cellphone model. Our battery is sent out with little or no power, so please charge it for about 6-12 hours before using. 3. Keep an extra battery on hand for extend standby and talk times. 4. Integrated microchip prevents overcharging and lengthens battery life. 5. New Lithium-Ion batteries must be FULLY CHARGED and FULLY DISCHARGED 2 to 3 times, before being FULLY CONDITIONED. Please remember that a new Lithium-Ion batterys full performance and longevity is only achieved after 2 to 3 complete charge and discharge cycles. After you go through 2 to 3 cycles, youll never have to condition your battery again! HOW TO USE-Please charge for minimum 2-3 hours while put switch off your. Battery backup will good after two days. Do not use charger then 2 amp. It will reduce battery backup and life. Battery is brand new and provides backup as good as original battery with the mobile. This battery is the best alternative for your great and will never explode or give any problems. This battery has been designed specifically for your handset and is ideal as a second battery or replacement for your original battery. Simply charge one while the other is in use and you'll be able to use your Smartphone all day every day! This product provides outstanding talk and standby times. These batteries deliver the long-lasting and reliable performance you deserve. We ask you to use an original company charger to charge your mobile and our battery any other than original charger can affect your battery and mobile drastically. Check if there is any dust in the connector or if any pin is broken or not. Also check for any corrosion in contact and plug. Clean the plug using IPA or swabs. Make sure you use ESA safe ----- only check the interface connector to see if there is any dust or not. If there is any dust then clean or replace the interface connector as required. If the problem is not solved then update the software/operating system (os) to the latest version If the problem is still not solved then check the mobile PCB current consumption If all fails the you have 10 days to replace or return the battery from the date of delivery. THE BATTERY INSTRUCTIONS Please drain all the power of the battery for the first 3 times before charging, and then take a full charge. Thus the battery can be reached the optimum effect of using. Please note that its full effect and longevity is only achieved after 3 to 5 complete charge and discharge circles 4000mah