Ordered two of these for Dell E6520's. The first one got me a solid 4 hours, the second one got me 2 hours. If your laptop battery is dead, this is a cheap solution, but the results are hit or miss.
KVAGO IPad Air (5Th & 4Th Gen) Keyboard Case - 2022/2020 10.9" With 7 Colors Backlit, Pencil Holder, Detachable Wireless Keyboard
32 Review
Silver Stainless Steel Bling Bracelet Compatible With Fitbit Versa/Versa 2 For Women - Replacement Accessory Strap Bangle For Versa Lite Edition/Versa SE
31 Review
Chesona IPad Keyboard Case With Multi-Touch Trackpad, Backlit Keys In 7 Colors, Pencil Holder, Dual Bluetooth Channels, And Flip Stand, Compatible With 10.2-Inch IPad 9Th/8Th/7Th Generation (Black)
26 Review
Rose Gold Touchpad Keyboard Case For IPad Pro 12.9 2020/2018 - Wireless Smart Magic Backlit Trackpad Keyboard
23 Review