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I've got a similar question. I'm using MURATA 19/66. It's labeled 3.7 V 2600mAh. That's how I've been charging it, but can I actually go to 4.1?
4.2 is considered the hi point voltage to charge to, the 3.7 is considered the average working voltage start point and the 3.2 is the average working voltage low point when in use.
there are some absolute minimums and maximums when charging and discharging... check out the info supplied by Mooch, he has the most comprehensive data collection that I know of on ECF.
there are some absolute minimums and maximums when charging and discharging... check out the info supplied by Mooch, he has the most comprehensive data collection that I know of on ECF.
that may be true for the cars battery packs ( which consists of 100s of individual batteries) and they are different in size too as compared to our beloved 18/650s. No telling what kind of protective electronics are stuffed into the battery packs for the cars that warrant a 90% charge rate, but then again, as you said... a rumor. Doesnt seem to make sense to loose 10% of your power when every percent counts. Kinda like filling your cars gas tank to 9/10ths full when you need all the tanks capacity available for those long road trips...
In contrast to gas tanks battery packs need to be replaced on a regular basis.that may be true for the cars battery packs ( which consists of 100s of individual batteries) and they are different in size too as compared to our beloved 18/650s. No telling what kind of protective electronics are stuffed into the battery packs for the cars that warrant a 90% charge rate, but then again, as you said... a rumor. Doesnt seem to make sense to loose 10% of your power when every percent counts. Kinda like filling your cars gas tank to 9/10ths full when you need all the tanks capacity available for those long road trips...
And those packs are very expensive, so every increase in cycle life counts.
If I'd have to buy a new gas tank/ battery pack each year for thousands of dollars, I'd give the manufacturer the middle finger.
YMMV of course
I charge my batteries to 4.2v. I have had some for three years now that still cycle just fine, and mah tests show that they are still just fine with very minimal wear.
Iirc @Mooch had data on this one. Iirc it can extend battery life to not charge or discharge some battery chemistries completely. How much it actually helps I don’t know which makes things hard. Getting battery wear info out of a battery can be difficult. Wear would still need to be monitored.
What and which cells a given make and model has varies. Some Teslas definitely use 18650s made by other manufacturers. Not sure which ones use what though. Tesla did develop its own 2x700 battery using a different chemistry. Something about aluminum being used Iirc.
it doesn’t charge as high as the batteries used in ecigs and isn’t useful in an ecig.
It's not the electronics, but the cells themselves. Industry standard for BEVs and a legal requirement in the US for PHEVs is and eight year, 80,000 mile warranty on the batteries.
If the Ultimate Life Span of a Battery is what you are seeking, then Yes, charging to 4.0 or 4.1v would Extend the Life of the Cell.
How much would it Extended it? No Clue? But I have seen people kick Numbers around like maybe 10% Longer.
To Me, getting a 10% Longer Life out of a 6 Dollar Battery is really Inconsequential. Because all I need to do Is Clip 1 or 2 Coupons when I go Grocery Shopping One Time and that is about what I would have Saved charging to 4.0 ~ 4.1 volts.
And then I get the Extra Run Time of charging to 4.2v for Free.
I simply cannot imagine the "savings" in run time (if it's truly 10%) would exceed the MOD run time of starting at 4.2 volts rather than lower.
IDK. Kind of seems like 6 of 1 half a dozen of the other. Maybe for hard to get batteries like AWs it might be a useful practice.
No, otherwise, I am just going to let my batteries charge to 4.2 volts. With my new nitcore there's probably a setting where you can do that (maybe, I doubt I will be finding out that soon) and IDK it just seems a bit picky to me.
Anna
IDK. Kind of seems like 6 of 1 half a dozen of the other. Maybe for hard to get batteries like AWs it might be a useful practice.
No, otherwise, I am just going to let my batteries charge to 4.2 volts. With my new nitcore there's probably a setting where you can do that (maybe, I doubt I will be finding out that soon) and IDK it just seems a bit picky to me.
Anna
Charging to a lower voltage will increase overall cell life, especially if charging to only 4.0V. But that needs to be weighed against the shorter run time you’d get and more frequent charging you’d need to do.
How much of an increase in overall life you could get depends fundamentally on how well you otherwise take care of the cell. You could get double the life or you could get just 10% more life.
For me, cells are dirt cheap considering the couple of years you can get out of them without doing anything special. For that I can enjoy fast charging and the longest vaping times every day for the cost of an extra set of cells every few years.
Aha!I knew I would get an answer! Didn't expect it that quick.
I take my cells out of the charger often when they are at or above 4v. I don't notice much warmth at that point, anyway. The charger is reaching coincidence with the target voltage and current begins to drop significantly as that happens.
They are. My brother just bought a model 3 and they definitely use 18650 cells in their battery packs
No sir, the Model 3 uses 21700s.
Tesla's original Roadster, the Model S, and the Model X all used 18650s though.
Thanks for that info Rossum. Much appreciated and will pass on to my brother whose Tesla dealer needs re-educating!
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