Bosch CoolPack 4.0Ah Batteries - Everything You Need to Know

bosch coolpack lithium ion batterySo I was talking to some of the Bosch guys yesterday in Denham and we had a bit of a chuckle about this one.

Yes, they admit it; Bosch is a bit late to the 4.0Ah lithium-ion battery pack party.

But then the cool kids typically are.

And when they do arrive, it's usually time for everyone to sit up a pay attention.

It's official and we've got the inside scoop on it, thanks to the ever-attentive Power Tool Spy.

Bosch is releasing a 4.0Ah lithium-ion battery pack. Full details will come out in January 2013 when the packs are officially launched, and you'll be able to buy them for your cordless professional power tools from Toolstop in February 2013.

What's the big deal about Bosch's 4Ah li-ion battery packs? After all, we're now used to having 4Ah packs in our power tools thanks to Metabo, Hitachi and DeWalt.

Each of those manufacturers makes boasts and claims about what their 4.0Ah packs can do for your power tool's run-time.

Remember, the higher than Ah number, the more capacity, not power, the battery offers you. Hence, like all the other battery packs Bosch is claiming extended run-time per charge.

But what is Bosch's claimed number on this compared to, say, Metabo or DeWalt?

Last December we brought you the Power Tool Spy exclusive that Metabo was launching a 4.0Ah li-ion battery pack, the first of its kind on the market.

Metabo claimed that these batteries, due to their higher capacity, would allow you 33% more runtime.

Then earlier this year we brought you the exclusive news that DeWalt was arriving in a blaze of black and gold at the 4.0Ah li-ion battery pack party.

And like Metabo, DeWalt's numbers stood at 33% more runtime.

Here's where things get interesting.

In the documents we've seen for the forthcoming release of Bosch's CoolPack, the company is claiming an incredible "up to 65%" more runtime.

Bosch coolpack lithium ion batteryLike us, you'll be wondering how its possible to make such a claim. And I didn't fail to notice the wry smile on the face of one Bosch employee I spoke to yesterday when he said, "well, we may be late to the party, but we've arrived with a fantastic product that handles heat better than anyone else."

bosch coolpack lithium ion battery packAnd that seems to be the key to the CoolPack.

Which should be self-evident from its name...

Here's the deal with battery powered tools;

They generate heat. All the big players in the power tool market know this and it's an on-going concern and issue for them.

You, the guy/gal on the jobsite, want more power from your cordless power tools. To provide you with that power you need beefier motors. To fuel those motors you need higher capacity batteries, batteries that can get the power to the motor faster and more efficiently, allowing the motor to run for longer.

And that generates heat.

And heat is the enemy of your power tool. It literally kills them. Hence the smart power tool manufacturers building checks and balances into their technologies to monitor and control heat within the battery and motor of your tool. Hence brushless motors (less heat, more efficiency, longer life, click to read our article explaining how this works).

And now Bosch's CoolPack.

CoolPack isn't just one of those clumsy names marketing teams come up with (remember Metabo's "Impuls"?). It's directly related to a key element of technology Bosch has built into these 4.0Ah packs; active temperature management.

Here's why:

  • too much heat generated by your battery and the lithium-ion cells die
  • as these cells die, the less efficient your battery becomes
  • the less efficient your battery becomes, the more it needs to be dropped onto the charger

And that costs you time and money.

Bosch CoolPack Lithium Ion BatterySo let's step back and figure out where this "up to 65%" more runtime (over 3.0Ah batteries) comes from.

If the CoolPack system is better managing the heat generated within the battery, the cells will be healthier. And when the cells are healthier they hold and distribute their charge more efficiently.

Bosch also claim that the cells used in these new battery packs are "high quality". Obviously we'll need some qualification from them as to what that actually means.

You'll also notice from the diagram above that these packs will survive a 3m drop, they're (typically for Bosch!) " class", and surprise surprise, " class" also.

And as you'd expect, they're 100% backwards compatible with the Blue Bosch cordless tools you already own.

How does this change things in the professional power tool market?

Well, for one, it probably puts a bit more pressure on Makita to come to the party.

But ultimately it means that Bosch professional power tool users who've made the switch to cordless will be able to run longer, while resting in the knowledge that their battery pack is going to be protected by the technology within, saving them time and money.

And it might just be the tipping point for those of you who're still clinging to those power cords...

What we want to know from you is now that the "cool kid" has finally arrived, are you impressed with what they've brought to the party? Let us know in the comments.

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Toolstop on Mon, 08 Dec 2014 08:30:57 +0000 (Likes: 0 / Dislikes: 0

This is the one for you @Prakash

Prakash Kanji on Mon, 08 Dec 2014 03:30:49 +0000 (Likes: 0 / Dislikes: 0

Thanks for the cool pack info Mark.
I'm looking to buy a new 18v li ion kit after having sold my older 18v Makita gear. Battery longevity and tool reliability is top of my list....not necessarily grunt.
I'm after a hammer drill, impact driver, trim saw and jigsaw.

I prefer a smaller grip surface too.

What are your recommendations?


spacealien on Mon, 17 Mar 2014 08:35:58 +0000 (Likes: 0 / Dislikes: 0

wow,, thank you,,, I'm translating Bosch's website and I know zilch about tools,,, this really helps me to understand the whole thing,,,,

Tom Releasethe Kracken Manning on Tue, 16 Apr 2013 16:05:30 +0100 (Likes: 0 / Dislikes: 0

these batteries are fantastic. easily last all day, of very frequent heavy use. .. bit expensive though, but you get what you pay for in this instance.

Colin on Thu, 21 Mar 2013 17:41:30 +0000 (Likes: 0 / Dislikes: 0

Cheers mate thought they would but didn't want to go out and buy em

Toolstop on Thu, 21 Mar 2013 10:23:44 +0000 (Likes: 0 / Dislikes: 0

Yes, the 4Ah battery will work on your drill Colin

Colin on Wed, 20 Mar 2013 21:13:50 +0000 (Likes: 0 / Dislikes: 0

This may seem thick but will the 4ah battery work on my drill which came with the 3ah battery when I bought it new 6 months ago

Wayne Burgess on Fri, 01 Feb 2013 18:34:55 +0000 (Likes: 0 / Dislikes: 0

Would love to test this on site :)

Chris Murray on Wed, 23 Jan 2013 11:01:29 +0000 (Likes: 0 / Dislikes: 0

It is the exactly same size which is good in my opinion. I read that the 4.0ah cells are finer/tighter wound compared to the 3.0ah. This makes them more dense but same size. This also means they offer less electrical resistance so more efficient. The 65% more run time is down to the new heat conductive housing that helps control heat build up and therefore keeps them running efficiently. I am looking forward to this :)

Mark Hunter on Wed, 23 Jan 2013 10:44:10 +0000 (Likes: 0 / Dislikes: 0

Allen - I'm sitting with some of the guys from Bosch right now and they'd love to allow you to put the CoolPack to the test. Can you get in touch with me please -

Allen on Fri, 21 Dec 2012 09:35:58 +0000 (Likes: 0 / Dislikes: 0

The clamshell of 4.0Ah battery looks same as 3.0Ah, so I think they are same at cooling. Therefore, I still cannot understand why "65% more running time". on Wed, 19 Dec 2012 21:18:19 +0000 (Likes: 1 / Dislikes: 0

If all the claims they are making hold true I am decidedly impressed.

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