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Schottky diode lithium charge test (Patreon)

Published:
2024-03-11 22:38:25
Imported:
2024-03

Content

An experiment to see what happens when a classic TP4056 module charges a lithium cell with a schottky diode in series with it.

It was to see if it still charged it normally, but stopped sooner at a lower voltage.  But it went a bit odd.

https://youtu.be/FJepVdY93lM

Files

Schottky diode between charger and lithium cell?

An experiment to see what would happen if a Schottky diode was put between a TP4056 charge module and a lithium cell, to skew the apparent cell voltage. Charging a lithium cell to a lower voltage like 3.9 or 4V extends its lifespan and number of charge cycles greatly. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

Ramast

Shouldn't a lithium battery charger first read battery's voltage before charging it. For example because if battery's voltage is less than 2.5V, it should provide low initial current? How is it able to read the voltage with a diode connected in series?

bigclive
>>132102493

I tried a bypass resistor so it could see the voltage and it still didn't work in a stable manner.

Mike Page

Was the idea to simply have CC charge to 80% and no CV charge? I think you might need some intelligence in there (microcontroller). You could have the Schottky (or a normal diode) bypassed by a FET until *you* think charge is done, then remove the bypass. But yeah ... bit of a sledgehammer.

Gordo
>>132222156

..or select a different chip that's programmed to charge to a lower voltage for some alternative lithium chemistry..