Bosch Core18V Battery Pack 03 Battery Reviews & Chargers

Bosch CORE18V Battery Review – UPDATED

Bosch Power Tools unveiled its Bosch CORE18V battery at the 2017 World of Concrete. Ten high-density Bosch CORE18V cells are welded and rail-connected to deliver what Bosch claims is 80% more power, longer runtime, and better heat transfer with updated CoolPack technology over previous generation Bosch batteries. The Bosch CORE18V battery is 100 percent compatible with all 18-volt Bosch Lithium-ion tools and chargers.

“Bosch looks at battery power from the user perspective. What do users want? They want greater power and more runtime in a compact size, which is what CORE18V is all about. CORE18V represents a big piece of the Bosch effort to build end-to-end product systems that offer superior performance, no matter what the job is. Based on increased power and runtime, plus backward compatibility across the full power tool lineup, we feel this is a step beyond battery power systems that are currently available.”

–Theron Sherrod, product manager, Robert Bosch Tool Corporation


Editor’s Note: Bosch has released a new Core18V 4.0 Ah battery. Scroll to the bottom of the review to see the new information we’ve added since this review first published on March 29, 2018.

Bosch Core18V Uses Panasonic 20700 Battery Cells

Bosch Core18V 20700 Panasonic cellsThe “Core” of the new Bosch Core18V battery is the use of Panasonic 20700 cells. These are higher density, larger capacity cells that provide a lot more power than traditional 18650 cells. We’ve seen other manufacturers using these cells—the new Metabo LiHD batteries come to mind. While this is a big jump, Milwaukee is moving even further to a 21700 cell in the near future.

It seems like the bigger cells might be a natural transition for manufacturers looking to draw more power out of their packs. In the case of the Bosch Core18V packs, they can now draw up to 1440 Watts as opposed to a maximum of 800 Watts from their current 6 Ah packs. That’s where they get their 80% more power stat (1440/800 yields an 80% increase).

Bosch CORE 18V battery cool pack

The new Bosch CORE18V battery CoolPack separates each cell into its own compartment.

Cool Under Pressure

The new Bosch CORE18V battery uses an updated CoolPack design. It manages heat in a more efficient way by separating each cell into its own compartment. It’s more than just physical separation, though. The resin Bosch uses in their CoolPack acts absorbs heat to draw it away from the cells so they run cooler.

Lithium-Ion Battery Maintenance: 5 Performance Killers

It also uses welds and copper to promote much quicker energy transfer between the cells (AKA reduced resistance). Copper offers a significant improvement in energy transfer compared to other metals and the weld is a marked upgrade from simple solder technology.

Bosch Core18V batteries laser welds

So How About that Performance Boost?

I put the Core18V battery to work in Bosch’s new reciprocating saw – the GSA18V-125 – to see what kind of performance it has against Bosch’s current 6 Ah battery pack.  Regardless of what battery you use, you’ll want to give the new recip a look. It’s an impressive upgrade for Bosch.

Bosch 18V Reciprocating Saw Makeover: GSA18V-125

As far as testing goes, I did some controlled environment cutting in 2 x 12 PT, both clean and with nails embedded. With a 10-pound weight ensuring consistent downforce, I made dozens of cuts to sort out the numbers.

Bosch Core18V Battery Pack 02

When all sawdust settled, the Bosch Core18V battery really did provide a performance boost. In both orbital and non-orbital modes, the time gain is roughly 0.4 second or 4%. That’s a far cry from the 80% Bosch is claiming, so what’s the deal?

Bosch Core18V Battery Pack

That test doesn’t put the saw in danger of stalling, so neither battery is calling on all its available resources to keep the blade moving. If it did, the packs would have been much hotter than they were. However, since the Core18V can call on 1440 watts over the 800 watts of the standard 6.0 amp hour battery, it means cordless tools in Bosch’s future can be much more powerful – just because the battery can deliver more. What this test shows is that you do get a slight performance boost even when you’re not putting a ton of stress on the tool.

From there, we also ran some testing using Bosch’s new 18V Connected Grinder. Running through full battery cycles for the 6.0 Ah and Core18V packs in 5/8″ rebar put a little more perspective on the difference.

Bosch 18V Connected Angle Grinder GWS18V-45CN Review

The fastest cut we could make with the 6.0 Ah battery was 18.3 seconds while the Core18V managed 10.7 seconds. That’s a 42% increase in cutting speed.

Bosch 18V Connected Angle Grinder GWS18V-45CN Review

For runtime, the 6.0 Ah pack made 15 cuts, while the Core18V finished 21 – a 40% increase. Even just looking at no-load speed, the Core18V battery spins a grinding wheel 360 RPM faster than the 6.0 Ah pack.

Bosch 18V Connected Angle Grinder GWS18V-45CN Review

Charge Time

Charging technology is clearly different from one manufacturer to the next and battery charge times vary widely. You can expect 40 – 50 minutes for a full charge cycle on the Core18V. You’ll be on the shorter side when the battery is cooler and on the higher side when it’s hot.

What About the Future?

Bosch has a reputation for producing high-quality tools that are tough on the job site, but several categories have lagged behind the industry in terms of performance the past couple of years. Aside from the fact that simply inserting the new battery pack will give those tools a boost, it opens the door for more powerful tools. Being able to pull 1440 watts from the pack instead of just 800 opens some pretty large doors, in fact.

So what should we expect?

First of all, Bosch is tight-lipped on development, so this is completely conjecture at this point. However, I expect to see Bosch’s first 1000+ in. lbs. drill or hammer drill along with an SDS-Max rotary hammer before too much longer. We can certainly expect a power boost in any of the new 18V tools they bring out, but these two, in particular, would be good targets. Bosch’s 18V Connected Grinder is actually the first tool they’ve launched built around Core18V as a foundation.

Keep your eyes open for more tools and for the introduction of 21700 cells at some point.

Any Chance of a 9 Ah Core18V?

Don’t hold your breath for a 3P pack (15 total cells). Bosch is being very intentional about keeping their 18V battery down in size. After all, we’re talking about 18V tools. Big, heavy 36V tools are generally accepted, but Bosch wants to keep the 18V line manageable. A big part of that is keeping the battery pack down in size and weight. Look for Bosch to continue developing even better battery pack design and moving to the 21700 cell – just don’t expect the pack to accommodate another row of cells.

Bosch 18V Connected Angle Grinder GWS18V-45CN Review

Update: 7/17/2018 – Bosch Releases Core18V Slim Pack

One of the things Bosch has done really well with their increase in amp hour capacity is to keep the pack size from swelling to an obscene amount. Tools like impact drivers and drills can benefit from Core18V technology, but don’t really need 6.3 amp hours if you can trade off some weight. The new Bosch Core18V 4.0 Ah slim pack battery answers that call.

Bosch Core18V 4.0 Ah Slim Pack Battery

We mentioned earlier the possibility of 21700 cells for future Core18V batteries and the 4.0 Ah pack has them. There is also an 8.0 Ah pack coming in 2019 as well by making the 1P pack a 2P pack.

Geek Note: 1P and 2P refer to the number of parallel sets. The Bosch Core18V 4.0 Ah pack is a 5S1P pack – 1 set of 5 serially connected. The 8.0 Ah battery would be a 5S2P – 2 sets of 5 serially connected cells. Check out more details about how those connections affect a battery below.

Voltage vs Amp Hours: What’s the Relationship?

For pricing, the Bosch Core18V 4.0 Ah battery is competitive with other packs in the same capacity class at $99 ($129 for Canada). You get the benefits that Core18V brings to the table along with a 15% reduction in weight over Bosch’s standard 4.0 pack.

The Bottom Line

The Bosch Core18V Battery Pack looks like it will open up some significant doors for Bosch’s future cordless lineup. Our testing shows a clear boost in both power and runtime for the Core18V pack and we’re still in the beginning stages of Bosch cordless tools designed for the higher power output the battery offers.

Right now at Acme Tools, the Core18V is a $20 increase over the 6.0 amp hour battery. That’s not horrible considering you do get a performance bump and slightly higher capacity. If you’re going to take advantage of some of the more powerful tools out there like rotary hammers, it’s a boost you’ll enjoy having.


Bosch CORE18V Battery Features

  • Greater power (up to 43%) than previous generation Bosch batteries
  • Longer runtime
  • Updated CoolPack technology for better heat transfer
  • Compatible with all Bosch 18V tools and chargers

Bosch CORE18V Battery Specifications

  • Item number: GBA18V63
  • Voltage: 18V
  • Amp hours: 6.3
  • Fuel gauge
  • Temperature usage: to -4F
  • Price: $149

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Heath Torville
Heath Torville

What a piss poor effort, does anybody even read the stuff they write before putting it up?

“The resin Bosch uses in their CoolPack acts absorbs heat to draw it away from the cells run cooler.”

Word salad.


My Bosch Impact (1/2″ brushless) *seemed* to gain some lug busting power with the 6.3 CORE battery. It wasn’t terribly weak before, but it’s pretty rare that this setup can’t pop something loose now. Pretty impressive.


BOsch is way ahead of the pack with the new battery design. All my tools have gotten noticeable power increases adn that battery seems to never die. I’ve yet to burn down the battery during a project yet. I work 8-10 hour days and i like to charge my batteries at night.


Is the Bosch CORE stuff in any way related to the CORE outdoor power equipment brand? I vaguely remember CORE’s brushless motors were of a different design than typical brushless motors.