https://stream.echo6.co/videos/watch/68297e5a-90e3-4bce-b52d-dd3a0494da9c How much capacity has this 20+yo 1000+ cycle Panasonic 14500 lithium ion battery lost? 00:00 - Panasonic electronic shaver teardown 06:30 - Battery dimensions match the type number 08:24 - The battery capacity test setup 10:40 - 500mA Constant Current test 11:38 - How much energy is left in a "flat" battery? 13:46 - 250mA Constant Current test 14:54 - 100mA Constant Current test 15:13 - Results analysis. Talking head Dave 19:11 - How to scale time in Excel 21:20 - How to get a characteristic battery capacity graph in Excel 24:35 - Energy in a battery and the characteristic curve area, it's just an integral 26:30 - Optimising product design and battery cutoff voltage 29:13 - Battery current measured Forum: https://www.eevblog.com/forum/blog/eevblog-1732-20yo-1000-cycle-panasonic-li-ion-battery-tested/ Web Site: http://www.eevblog.com Hardware Store: https://eevblog.store/ Merch Store: https://eevblog.dashery.com/ If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog Other channels: EEVblog2: http://www.youtube.com/EEVblog2 EEVdiscover: https://www.youtube.com/eevdiscover #ElectronicsCreators #Battery #lithiumbattery Mon, 13 Apr 2026 22:59:57 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/68297e5a-90e3-4bce-b52d-dd3a0494da9c All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.