Stupid observation

[bombastinator]

Is it me ? Or do old half dead batteries effectively fill faster because they have less capacity than they once did?

 

[Mordacai]

I think you may be right with battery aging @bombastinator2.

 

[The60WattGUY]

Make sense it loses mah with aging so meaning itll be faster to fill it

 

[ShowMeTwice]

@bombastinator2 @Mooch would be the person to ask.

Per the Battery University:

BU-409a: Why do Old Li-ion Batteries Take Long to Charge?

BU meta description needed...

batteryuniversity.com

 

[ShowMeTwice]

In my experience older Li-ion batteries take longer to charge versus a newer battery.

The link in my previous post explains why.

 

[Falconeer]

I don't know if mods with built in batteries are any different, and logically they shouldn't be, but my old set of seven iStick 30ws, which I'd used for over 6 years, in their latter stages took the same time to recharge but went down quicker than when they were new.

 

[Mooch]

Is it me ? Or do old half dead batteries effectively fill faster because they have less capacity than they once did?

This is often the case but it depends a lot on how the charger determines when to stop. @ShowMeTwice’s link describes (fairly technically) what can happen to keep charging time fairly steady or extend it. But if the charger stops once the cell reaches 4.20V, and doesn’t continue on to “top off” the cell, then the charging time can get shorter and shorter as the cell ages and loses capacity.

I‘ve had a decent number of cells take less and less time to “bulk” charge (as they lose capacity over the years) but take longer and longer to “top off” for the final few percent of charging.

 

[ShowMeTwice]

This is often the case but it depends a lot on how the charger determines when to stop. @ShowMeTwice’s link describes (fairly technically) what can happen to keep charging time fairly steady or extend it. But if the charger stops once the cell reaches 4.20V, and doesn’t continue on to “top off” the cell, then the charging time can get shorter and shorter as the cell ages and loses capacity.

I‘ve had a decent number of cells take less and less time to “bulk” charge (as they lose capacity over the years) but take longer and longer to “top off” for the final few percent of charging.

Thanks Mooch. I appreciate your taking the time to explain that. The "top-off" time taking longer is what I was referring to in my last post.

Question: Does the longer "top-off" charge time on an older cell have anything to do with the higher IR an older cell has?

Thanks!!!

 

[Mooch]

Question: Does the longer "top-off" charge time on an older cell have anything to do with the higher IR an older cell has?

TBH, I don’t know.
The increase in IR as the cell ages is comparatively small so I wouldn’t think it would have a big effect on charging. But perhaps at the very end there is a large jump in IR, forcing the cell’s voltage up, and slowing down the current flow into the cell.