Bosch GSB 18V-45 Review: a compact pro drill with more batteries than you probably need

I’ve been using the Bosch Professional GSB 18V-45 for a few weeks for jobs around the house and a couple of heavier DIY projects (stud walls, concrete fixings, some decking work). I’m not a full-time tradesperson, but I use tools more than the average weekend DIYer, and my old mid-range drill was starting to complain every time I hit brick or big screws. So I wanted something compact but still properly capable, without jumping into the huge and heavy stuff.

This kit is the version with 3x 4.0 Ah ProCORE batteries, the GAL 18V-40 charger and the L-Case. That’s important, because half of what you’re paying here is basically the battery ecosystem. I already knew Bosch blue had a good reputation, but I went into this trying to see if this particular kit really earns its price, or if you’re just paying for the logo and the blue shell.

In practice, I used it for fairly typical things: drilling 6–10 mm holes in brick for wall plugs, 4–6 mm holes in metal brackets, and driving 5x80 and 6x100 screws into timber. I also used the hammer function on some pretty hard brick and an old concrete lintel. Nothing extreme, but definitely enough to see if it’s more than a casual DIY drill. I swapped between batteries on purpose to test runtime and charging, not because they were actually running out.

Overall, it feels like a compact, no-nonsense pro drill that’s strong enough for most domestic and light trade jobs. It’s not perfect and it’s not cheap, but it does its job well. The biggest surprise for me was how much difference the three ProCORE batteries make in day-to-day use, and how much I appreciated the lighter weight compared to my older, bulkier combi drill.

Price-wise, this kit sits in the upper mid to high range for an 18V combi drill. You can definitely find cheaper drills that will still put holes in walls and drive screws. The question is whether the extra cost here is justified. For me, the answer depends on how you plan to use it and whether you’re interested in the Bosch 18V ecosystem long-term.

If you break it down, three ProCORE 4.0 Ah batteries on their own are already a big chunk of the price. Add a brushless pro-grade drill and a charger, and the total doesn’t look crazy anymore. Compared to buying a cheaper kit with one or two basic batteries, this set feels more like an investment in a battery platform. If you’re going to stick with Bosch Professional and maybe add a body-only impact driver, multitool or small circular saw later, the value starts to make sense because you won’t need to buy extra batteries for a while.

On the other hand, if you’re a casual DIYer who drills a few holes a month and builds an IKEA unit twice a year, this is probably overkill. You’re paying for performance and durability you won’t fully use, and two of those batteries will just sit in the case most of the time. For that kind of user, a cheaper Bosch green or another mid-range brand will get the job done for less money, even if it feels less solid and lasts a bit less.

So, in my view, the value is good but quite specific: it’s good for someone who wants a reliable pro-feeling drill, plans to use it regularly, and either already has or wants to build up Bosch 18V tools. It’s less attractive if you just want “a drill” and don’t care about brands or ecosystems. It’s not a bargain, but it’s not overpriced for what you actually get in the box.

The overall design is pretty straightforward: compact body, 13 mm metal chuck, standard controls, and a work light near the base. What stood out to me is the size. That 174 mm head length actually makes a difference when you’re drilling between joists, inside cupboards, or close to corners. I used it to fix a batten inside a tight airing cupboard where my older drill barely fit, and this one gave me enough room to see what I was doing and keep the bit straight.

The grip is comfortable, with enough rubber to feel secure even with slightly dusty hands, but it’s not overly padded. The drill sits well in the hand and doesn’t feel top-heavy, even with the 4.0 Ah battery. I drove a full box of 5x80 screws into a stud wall over one afternoon, and while my arm was tired (that’s normal), I didn’t feel like the drill itself was awkward or badly balanced. The trigger is nicely progressive, so you can start slow and ramp up without sudden jumps in speed.

Controls are all where you’d expect: forward/reverse switch by the trigger, torque ring behind the chuck, mode ring for screw/drill/hammer, and a 2-speed slider on top. The click between settings is positive, so you know what you’ve selected without double-checking all the time. The only small annoyance is that the mode icons are a bit small and not super high contrast, so in low light you sometimes have to lift it up to your face to confirm you’re on hammer or just drill.

One detail I did like is the LED work light at the base. It’s not the brightest light ever, but it’s placed low enough that it doesn’t cast a big shadow from the chuck, which is something that annoys me on some other drills. Working in a dim hallway drilling into brick, I could see my mark clearly without needing a separate torch. It’s a simple design overall, but it feels like they’ve thought about daily use more than trying to make it look fancy for a catalogue photo.

The battery side is where this kit really stands out. You get three ProCORE 18V 4.0 Ah batteries and the GAL 18V-40 charger. Each of these batteries alone isn’t cheap if you buy them separately, so this kit is clearly designed as a way to pull you into the Bosch 18V ecosystem. If you already have Bosch batteries, three more might feel excessive. If you’re starting from scratch, it’s actually quite handy.

In practice, a single 4.0 Ah battery lasted me through several hours of stop-start work: drilling into brick, driving screws, and a bit of light metal work. I never managed to drain a battery completely in one session before I got bored or had to move on to something else. While I was using one pack, I put another on the charger. The GAL 18V-40 isn’t the fastest charger in the world, but it’s reasonably quick. From low to around 80% took roughly half an hour in my experience, which is enough that you can pretty much rotate batteries and never run out.

The ProCORE batteries are a bit more compact and lighter than some older standard 4.0 Ah packs I own from other brands. On the drill, they feel balanced and don’t make the tool bottom-heavy. They also fit all the other Bosch Professional 18V tools and AMPShare alliance tools, which is a big plus if you plan on expanding your setup later (impact driver, circular saw, etc.). I didn’t notice any obvious overheating or weird behaviour; they stayed just warm during repeated hammer drilling into brick.

The honest downside: three batteries is probably more than most casual users will ever need, and it pushes the price up. For a DIY user who drills the odd hole at the weekend, one or two batteries would be enough, and a cheaper kit might make more sense. But if you plan to build a small fleet of 18V tools, this set gives you a very solid battery base, and you won’t be waiting on charging all the time.

In terms of build, the GSB 18V-45 feels robust and well put together. The 13 mm metal chuck is the first thing you notice – it looks and feels sturdier than the plastic chucks you get on cheaper drills. After swapping bits a lot over a few weeks, it still tightens smoothly and holds firmly. No wobbly feel, no crunching sounds. The brushless motor should, in theory, mean less wear and tear compared to brushed models, but that’s the kind of thing you really judge after a year or two, not a month.

The casing is the usual Bosch blue plastic with rubber overmold on the grip and key impact areas. I’ve already knocked it off a low ladder once (about 1.5 m onto a wooden floor) and dropped it onto concrete from waist height. Result: a small scuff on the plastic, but no cracks, no loose parts, and no performance issues. The battery fit is tight – they slide in and click solidly, with no play or rattling. That gives some confidence it can handle being thrown in a bag or a van without falling apart.

The L-Case also feels up to the job. The hinges and latches are basic but solid, and the plastic doesn’t flex too much when you stand on it. I’ve stacked some other tool cases on top and it hasn’t warped. The interior moulding holds everything securely, so you don’t open it to find bits everywhere. It’s not waterproof or dustproof or anything fancy, but for normal building site or garage use, it’s fine.

Obviously, I can’t pretend I’ve done a multi-year endurance test. But based on Bosch’s general track record and how this one feels and behaves so far, I’d expect it to last well for a serious DIYer or light trade use. If you’re a full-time tradesperson hammering it 8 hours a day, 5 days a week, you might eventually want something with more torque and maybe a backup drill, but I don’t see this one falling apart quickly under normal use.

On paper, this drill has 45 Nm max torque and 1,900 RPM. That’s not the top of the food chain compared to some beefier 18V or 36V monsters, but in real use it’s more than enough for most jobs around a house and light trade work. I used it in both speed ranges: low gear for driving long screws and drilling larger holes, high gear for smaller drill bits and quicker work in wood and metal.

In timber, it handled 5x80 and 6x100 screws without drama. In low gear, it drove them straight into studwork and old pine joists without stalling. If you’re not careful, it will happily bury the screw heads below the surface, so you do need to use the torque settings properly or just go gently on the trigger. I didn’t feel any lack of power there compared to a bulkier combi I have from another brand. For smaller screws and cabinet work, the clutch feels consistent and doesn’t slip randomly.

On masonry, I tested the hammer mode on standard brick and a harder concrete section near a lintel. With 6 and 8 mm masonry bits, it drilled clean, straight holes for wall plugs. It’s not as fast as a dedicated SDS drill, and I wouldn’t use it to chase out channels or drill big anchor holes all day, but for typical plug and screw jobs it’s totally fine. You feel some vibration, but it’s manageable, and the brushless motor keeps the speed steady under load.

Metal drilling was also fine. I drilled 4–6 mm holes into steel brackets and angle iron at high speed with decent HSS bits, and it went through without complaining. The chuck held the bits firmly; I didn’t have any slipping issues. Overall, the performance is solid rather than extreme. If you’re doing heavy structural work in concrete all day, you’ll want something bigger. But for mixed work – timber, brick, light metal – this drill gets the job done without feeling underpowered.

Out of the box, you get: the GSB 18V-45 drill body, three ProCORE 18V 4.0 Ah batteries, the GAL 18V-40 charger, and the L-Case. No drill bits, no screwdriver bits, just the bare tool kit. So if you’re expecting a starter kit with accessories, this isn’t it. It’s clearly aimed at people who already have bits lying around or know exactly what they’re buying.

The L-Case is pretty solid. It’s not as fancy as some modular systems with rails and full-on click mechanisms, but it stacks fine and protects the drill well. Inside, everything has its place: drill, three batteries, charger. Nothing rattles around. It feels like something you can throw in a van or a messy garage without worrying too much. I’ve had it sliding around in the boot and it’s holding up with just a few superficial scratches.

The drill itself looks like a typical Bosch blue: blue body, red accents, rubber around the grip and key areas. Controls are standard: trigger, forward/reverse switch, torque ring, and the extra ring for mode selection (screw, drill, hammer). There’s also the two-speed switch on top. If you’ve used any modern combi drill, there’s nothing confusing here. I didn’t even look at the manual to get started, and I’m usually the guy who does read manuals.

My first impression when I held it was that it’s short and compact. The head length is only 174 mm, and you do feel that difference in tight spots compared to older, longer drills. The weight with a 4.0 Ah battery is not featherlight, but it’s well balanced. Overall, the presentation matches what I’d expect from a “pro” kit: nothing flashy, just practical and solid. On the downside, at this price I would have liked at least a small starter bit set or a belt hook in the box.