For William and the Bosch ream. This was posted elsewhere. Is it accurate?

[Alaskan]

Is this true?

"Just tripped across the phraseology I should have been using to explain this better.

"Hybrid and electric cars utilize advanced battery management systems that maintain packs between 20% and 80% to reduce stress, and this is part of why they typically hold up so well for so long."

Bosch (and others in the battery market) are also utilizing this technique. What is reflected to the user as 0 - 100% is actually just the center cut of the voltage capability of the batteries they build.

(This is why they cost more, and is different than the methods used by cheaper battery manufactures or for ones with no BMS. Long story short, don't worry about managing your battery, the BMS does this for you. Fully charge it every chance you get.).

 

[William - Bosch Team]

Is this true?

"Just tripped across the phraseology I should have been using to explain this better.

"Hybrid and electric cars utilize advanced battery management systems that maintain packs between 20% and 80% to reduce stress, and this is part of why they typically hold up so well for so long."

Bosch (and others in the battery market) are also utilizing this technique. What is reflected to the user as 0 - 100% is actually just the center cut of the voltage capability of the batteries they build.

(This is why they cost more, and is different than the methods used by cheaper battery manufactures or for ones with no BMS. Long story short, don't worry about managing your battery, the BMS does this for you. Fully charge it every chance you get.).

I've heard of and read about the general idea of 80% capacity to reduce stress on the cells, and hopefully promote a longer life. It makes sense. I've not heard anything about Bosch reflecting a different value or using the "center cut" though. When I do some math on the individual cell capacity vs. entire Powerpack capacity, it does not seem that we do this, but I really don't know.

This line is accurate for what Bosch advises: "Long story short, don't worry about managing your battery, the BMS does this for you. Fully charge it every chance you get."

 

[Dallant]

Is this true?

"Just tripped across the phraseology I should have been using to explain this better.

"Hybrid and electric cars utilize advanced battery management systems that maintain packs between 20% and 80% to reduce stress, and this is part of why they typically hold up so well for so long."

Bosch (and others in the battery market) are also utilizing this technique. What is reflected to the user as 0 - 100% is actually just the center cut of the voltage capability of the batteries they build.

(This is why they cost more, and is different than the methods used by cheaper battery manufactures or for ones with no BMS. Long story short, don't worry about managing your battery, the BMS does this for you. Fully charge it every chance you get.).

That might very well be a trade secret they would neither confirm nor deny.

 

[Luto]

If it is not, it should be a trade secret.

 

[fooferdoggie]

well apple tells you it does not charge to 100% unless it is going to be on the charger a long time. so its not really a secret.

 

[Asher]

I'm sure they *do not* do that with ebikes.

1) they'd probably have boasted about it by now if they did
2) It cuts range by 40% and we all know how range is the first thing people ask about. While Bosch powertrains may be efficient, they're very much in line with their stated capacity, eg 500 wh. If they did have low range, they would tell us this is why.
3) replacement batteries on an ebike are one of Bosch ebikes' sources of profit, in large part because customers don't pick ebikes on the basis of replacement battery costs. With cars, replacement batteries are often unnecessary, or highly scrutinized by new car buyers, so there's pressure to keep the prices down and the profits low.

Also, Luna offers a battery charger that does this for $100. With Bosch's scale, it would cost them a fraction of that. This type of battery management isn't that costly.

 

[Asher]

well apple tells you it does not charge to 100% unless it is going to be on the charger a long time. so its not really a secret.

For iPhones Apple merely delays charging to 100%. So instead of your phone hitting 100% in the middle of the night when you're sleeping for example, it charges to 100% by the time you start using it (eg when you wake up).

 

[webcurl]

For iPhones Apple merely delays charging to 100%. So instead of your phone hitting 100% in the middle of the night when you're sleeping for example, it charges to 100% by the time you start using it (eg when you wake up).

That's smart.
On a more simple note my Lenovo has an option for when it's always connected to mains it maintains the charge at 60% which is great for the battery. But you have to manually turn it off if you can foresee you may want the 100%.

 

[Asher]

That's smart.
On a more simple note my Lenovo has an option for when it's always connected to mains it maintains the charge at 60% which is great for the battery. But you have to manually turn it off if you can foresee you may want the 100%.

Yeah a lot of laptops (but not all, like Acer) have it built in. Pretty good idea to use unless you regularly run out of power while out and about.

I doubt the iPhone trick does much compared to not charging to 100% to begin with. You have to wonder why they didn't even make it an option, especially in light of Apple's proven record of slowing down phones to promote new sales. I.e. Apple is deliberately making it hard to charge to 80%, to encourage purchases of new devices. If they truly cared about being green, they would ask you when you first set up the phone how much you want to charge the phone to.

 

[Dallant]

Yeah a lot of laptops (but not all, like Acer) have it built in. Pretty good idea to use unless you regularly run out of power while out and about.

I doubt the iPhone trick does much compared to not charging to 100% to begin with. You have to wonder why they didn't even make it an option, especially in light of Apple's proven record of slowing down phones to promote new sales. I.e. Apple is deliberately making it hard to charge to 80%, to encourage purchases of new devices. If they truly cared about being green, they would ask you when you first set up the phone how much you want to charge the phone to.

My iphone often wants to schedule my charging to complete at 3am.