Battery Replacement Service Kit for Garmin Forerunner 405/405cx This repair kit is to replace the battery of the Garmin Forerunner 405/405cx with a brand new, genuine, original manufacturer Garmin battery. This battery is made by Route JD and is the exact battery that Garmin uses in factory. This is the only battery that will restore original battery performance to your watch. The manufacturer, Route JD uses proprietary technology to provide 30% more battery capacity in the same cell size. Standard LIR3048 Lithium Ion rechargeable batteries will not last as long. Manufactures in China often exaggerate the performance of their batteries so they can claim better performance but don't fall for these false claims. Garmin uses the Route JD batteries for a reason: they are the best! All rechargeable batteries have a limited life and lose their endurance over time and number of recharges. The Forerunner 405/405CX uses a custom battery and replacement requires disassembly of the watch and soldering to install the new battery. Once you purchase the Battery Replacement Service Kit, we will send a kit that includes an envelope with a pre-paid shipping label, an ID tag to tie on your watch, and instructions for how to send your watch to us. Once we receive your watch, we will replace the battery and test the battery life to ensure maximum performance. We will then ship it back to you. This process takes 5-10 business days once we receive the watch (does not include shipping time). PLEASE NOTE: If your watch does not power on when attached to the charger, the battery is not the problem and our repair service will not fix the problem. Not all watches can be repaired with our service. If the battery replacement fails to fix the problem, we will provide a refund, less shipping.