I had to replace the battery in mine. It is 14505 and it is soldered in. You can get the batteries at [link|https://www.aliexpress.us/item/3256803936953432.html?spm=a2g0o.productlist.main.3.2e726cffiwxVlY&algo_pvid=8336e2bf-300e-49e5-ac8d-a977f84aa634&algo_exp_id=8336e2bf-300e-49e5-ac8d-a977f84aa634-1&pdp_npi=4%40dis%21USD%213.99%213.51%21%21%213.99%21%21%402101e9d217001841359968489e0729%2112000028111953891%21sea%21US%21703856697%21&curPageLogUid=rtqGJ0mPDNyy|AliExpress.com|new_window=true]