Depending on your battery size requirements, or lack thereof, power tool batteries have reliable cells in them and the reliable charging circuits that goes with them and are both readily available for purchasing (both the battery and the charger) right off the shelf.
You may even have them already. You just need the buck converter and a cheap plastic connector/socket/plug from ebay/amazon to use it.
I've powered a 4B for almost 10 hours one a fully charged Ryobi battery (the 4Ah one, not the smaller 2Ah that usually comes with the tools), though the Pi was not heavily loaded, but a Pi 0 could run on one of those batteries for many hours. A pico will run for days and days on one of these if you're using power management features, like putting it to sleep, etc.
This thread has a pic of how one of the forum users set his up. You can get fancy with the buck converter, or not, up to you.
viewtopic.php?t=336626#p2014820
Edit: You may run into power tool batteries that no longer charge up. They are full of cells that are still very good. The entire thing just stops charging if at least one of the cells in there goes bad. The battery packs are a good source of reliable cells, you just discard the bad one. Obviously be very careful when dismantling these things to harvest cells, but it is easy to do. Same goes for old laptop batteries.
You may even have them already. You just need the buck converter and a cheap plastic connector/socket/plug from ebay/amazon to use it.
I've powered a 4B for almost 10 hours one a fully charged Ryobi battery (the 4Ah one, not the smaller 2Ah that usually comes with the tools), though the Pi was not heavily loaded, but a Pi 0 could run on one of those batteries for many hours. A pico will run for days and days on one of these if you're using power management features, like putting it to sleep, etc.
This thread has a pic of how one of the forum users set his up. You can get fancy with the buck converter, or not, up to you.
viewtopic.php?t=336626#p2014820
Edit: You may run into power tool batteries that no longer charge up. They are full of cells that are still very good. The entire thing just stops charging if at least one of the cells in there goes bad. The battery packs are a good source of reliable cells, you just discard the bad one. Obviously be very careful when dismantling these things to harvest cells, but it is easy to do. Same goes for old laptop batteries.
Statistics: Posted by memjr — Thu May 09, 2024 2:14 pm