li-ion only charging to 4.0v?

fire-stick

Enlightened
Joined
Oct 11, 2005
Messages
612
Location
Austin Indiana, USA
The 21700 built into the flashlight is only charging to 4.0v. I read somewhere this was only like 80 some odd %. I thought it was supposed to charge to 4.2v. I did have to adjust the setting in anduril 2 because it was reading too high compared to the fluke. Does this affect the charging too? It's a wurkkos ts21 btw.
 

Lynx_Arc

Flashaholic
Joined
Oct 1, 2004
Messages
11,214
Location
Tulsa,OK
The 21700 built into the flashlight is only charging to 4.0v. I read somewhere this was only like 80 some odd %. I thought it was supposed to charge to 4.2v. I did have to adjust the setting in anduril 2 because it was reading too high compared to the fluke. Does this affect the charging too? It's a wurkkos ts21 btw.
Charging to a lower voltage can increase the amount of cycles that is why tool battery packs charge to just over 4.0v/cell averaging about 20.5v for 5 cell packs off the charger.
 

degarb

Flashlight Enthusiast
Joined
Oct 27, 2007
Messages
2,027
Location
Akron, Ohio
Most of the time, I recall seeing 4.12 volts.

Does anyone know how much lower 4.12 is than 4.2?

To me, we are clawing for every milliamp possible to get enough candela for 10 hours.
 

Trout River

Newly Enlightened
Joined
May 3, 2020
Messages
86
I keep my cell phone between 40 to 80% most of the time. I charge my 18650 cells to 4.2 volts because they are cheap and easy to replace compared to a cell phone.

There is an option on my phone running Android 12 version 4.1 actually has a save your battery setting under battery and device care and it stops the charging at 85% so you get better battery life.
 

Lynx_Arc

Flashaholic
Joined
Oct 1, 2004
Messages
11,214
Location
Tulsa,OK
I keep my cell phone between 40 to 80% most of the time. I charge my 18650 cells to 4.2 volts because they are cheap and easy to replace compared to a cell phone.

There is an option on my phone running Android 12 version 4.1 actually has a save your battery setting under battery and device care and it stops the charging at 85% so you get better battery life.
I'm about the same.... I try to stop charging around 80% or so and recharge it when it gets into the low 40s depending on my need for the phone at the time. I agree with 18650s being cheap and charging them to 4.2v even though reducing the life of them you are already saving a fortune vs AA alkaleaks enough to pay for a handful of them.
 
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