Looking for a step up circuit to run some k2s from that will autoshutoff a 18650 cell at 2V or so. They're unprotected cells, but i thought it woudl be tter to have it built into the board (and perhaps configureable for multiple cell levels?)
Anyone make step up circuit with autoshutoff?
- Thread starter havand
- Start date
Help Support Candle Power Flashlight Forum
Crux
Newly Enlightened
Don't let them get that low! 2.5V absolute minimum (personal 3V limit). Probably less than 10% charge left at 3.3V anyway.
Most switchers don't have a shutdown circuit designed to protect lithiums, I use separate low voltage sense or protected cell or both.
How do you plan on charging these? A strict upper limit of 4.1V (or 4.2V depending on cell type) must be observed when charging.
Please be careful with unprotected cells.
Most switchers don't have a shutdown circuit designed to protect lithiums, I use separate low voltage sense or protected cell or both.
How do you plan on charging these? A strict upper limit of 4.1V (or 4.2V depending on cell type) must be observed when charging.
Please be careful with unprotected cells.
I know, thank you for the warnings. I'm just curious. I have 8 18650 cells laying around from my laptop battery refresh (which btw gave it better battery life, but didn't fix the % left display problem) and wanted to see if i could get any circuitry that would handle this. :/
Ty_Bower
Flashlight Enthusiast
Maybe try the Wizard2 driver from the Shoppe? It's supposed to shut down at 2.5V.
http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=522
I'm not sure you'll get as much drive as you want for your K2. There is also an adjustable version for a few bucks more.
http://theledguy.chainreactionweb.com/product_info.php?cPath=48_49_61&products_id=522
I'm not sure you'll get as much drive as you want for your K2. There is also an adjustable version for a few bucks more.
