Milwaukee 9.0ah battery coming soon.

[sae]

I guess this would be nice so more power hungry tools can be used with as decent battery life as we have been getting from drills.
Otherwise i don't see the point, Li has allowed to make cordless tools so much lighter and easier to operate. The real evolution will be when they manage to keep the same weight and volume for a 10Ah as for a current 3Ah, now they basically double the capacity by making it twice as big.  [huh]

Have a look at Metabo's LiHD batteries. They claim their 5.2Ah LiHD batteries have the same runtime as 8Ah Li-ion batteries and the compact 3.1Ah LiHD batteries compare to 5Ah Li-ion batteries.

https://www.metabo.com/com/en/info/news/highlights/lihd-battery-pack-technology/

I thought that Amp-Hours was a unit of energy.
(Or Watt-hours), which implies the Volts are known.

Energy output is rated at a specific amp draw (usually 500mA I believe?).

Go above or below that, and your total energy dissipated increases or decreases.

Example:

[attachimg=1]

 

[Holmz]

Yes [member=38144]sae[/member] but to say a 5.2-ah has twice the life of an 8-ah makes little sense to me.

 

[sae]

[member=40772]Holmz[/member] I think it's more the 5.5Ah has the same runtime as the equivalent 8Ah battery.

I think this is pretty feasible.

If I'm understanding this correctly, this mostly relates to the internal resistance of the battery. As the resistance goes up, more energy is lost dissipating at higher amperages.

So say you look at that chart I posted for example:

Discharging at 30A drops the total Ah output to 1.75, whereas at 5A, it's closer to 2.4A. If Metabo's new cell can discharge at 30A what normal cells at 5A, the total capacity "rises" 42%, just as a function of the lower resistance. This doesn't even take into account that you'd be stressing the cells less due to better tool performance, and higher voltage out at the given amps out.

Of course, this is only applicable in high-amp draws, if you're putting this on a LED light, you could probably find the correct Wh/hr discharged, and it would scale exactly as you think it would.

 

[Holmz]

[member=38144]sae[/member] I see it now.
Ideally it begs the question as to at what load the ah rating is done at, and whether that is the same? Or whether it is tailored to make the numbers look better.

 

[Wuffles]

[member=38144]sae[/member] I see it now.
Ideally it begs the question as to at what load the ah rating is done at, and whether that is the same? Or whether it is tailored to make the numbers look better.

When have numbers ever been tailored to make a product look better than it is?!

And whilst we're at it, what have the Romans ever given us?!

 

[Kev]

[member=38144]sae[/member] I see it now.
Ideally it begs the question as to at what load the ah rating is done at, and whether that is the same? Or whether it is tailored to make the numbers look better.

When have numbers ever been tailored to make a product look better than it is?!

And whilst we're at it, what have the Romans ever given us?!

I found this spoon ...

 

[Holmz]

[member=38144]sae[/member] I see it now.
Ideally it begs the question as to at what load the ah rating is done at, and whether that is the same? Or whether it is tailored to make the numbers look better.

When have numbers ever been tailored to make a product look better than it is?!

And whilst we're at it, what have the Romans ever given us?!

Who nose.

 

[Wuffles]

[member=38144]sae[/member] I see it now.
Ideally it begs the question as to at what load the ah rating is done at, and whether that is the same? Or whether it is tailored to make the numbers look better.

When have numbers ever been tailored to make a product look better than it is?!

And whilst we're at it, what have the Romans ever given us?!

Who nose.

Where are you lot from anyway, Nose City?

 

[Holmz]

You pick.

 

[Scorpion]

And whilst we're at it, what have the Romans ever given us?!

Roman Noodles.

[Mic Drop]

 

[Wuffles]

And whilst we're at it, what have the Romans ever given us?!

Roman Noodles.

[Mic Drop]

I like this, but did you get the original reference?

 

[Scorpion]

Shut up, Bignose.

Life of Brian right?