Dremel 8250-5 12V Cordless Rotary Tool Kit with Brushless Motor

My old AC direct drive brushed motor 3000 series is on it's way out (ton of high load use, the brushes are done, the stator has a crack, just overall done for. I considered another AC unit, but I found the 8000 series, which is driven by a 3s INR (I believe, may be IMR) and utilizes a brushless motor. I have around two dozen major 60v+ power tools that are driven with brushless motors, and I have designed/built numerous systems, vehicles, etc. using precision drive brushless, it's the way to go in almost every electric drive application. The 8250 (consequentially, 8150 and 8350, too) is a very good replacement. Delivering substantial torque under direct drive conditions is absolutely critical to a Dremel tool, and this system does the job as well as the AC unit. I would say it's an acceptable quality within the price range as far as both performance and general efficiency. Read on for the only perceived con; power supply availability. Battery use is... Okay, considering the power output. I will probably get one or two more batteries; one battery pack means you'll be significantly more likely to deep discharge it at high load, which is almost a worst case scenario for INR/IMR chemistry. While these are protected packs, it's extremely likely they will not enter cut off until around 3.0v/cell. (This is supposition, however, I am a credentialed EE and sys engineer with extensive design, manufacturing, and field work experience in DC systems with brushless drives of all kinds, large industrial applications, small RC vehicle applications, you get the idea. I have a seasoned "feel" for these type of systems.) Additional thoughts and comments:: I will probably build an external pack, maybe two, at around 6-8 amp hour size. The fact that the includes pack is rated at 3Ah is a bit suspicious, even for a top brand nameike Dremel. I haven't opened it yet, however, I would be entirely shocked if this pack consisted of anything other than three 18650 cells. It's likely managed by a displaced core BMS monitoring internal pack temp with a 10kΩ NTC, and individual cell voltages, reporting internal temp via the other contacts you can see on the battery (B+,B-,Temp, C1,C2; C1/2 are used as cell taps mid-cluster). This is sensible design, moving the BMS to the host device, as it makes a significant manufacturing cost reduction on the batteries. Conveniently, this also makes the packs an order of magnitude to rebuild once the cells crap out, or to build a big external pack, even one on a relatively short, DC/test point umbilical using a scavenged pack body. But I digress; this is circumstantial, and personal preference. If you need a DC Dremel specifically for confined space or otherwise where you COULD use an AC unit, this method might be inappropriate. In other words, if you need both tool accessibility and freedom from the AC cord, you should probably get one to three more standard energy packs, as you will quickly burn through the battery, both in energy consumption rate per use, AND overall service life of each pack. The pro of that is you can avoid deep discharge and increase pack life by as much as 50-60% in many cases. Anyways, do your homework on lithium ion, need be. None of this is anything new, it's just much more relevant with high power use modes on single cell series battery designs, and it's considerably more important still when you only utilize one battery pack. Overall, this is a suitable replacement for my high mileage AC source 3000 series, which says a lot. The price point is... Approaching prohibitive. The bundle doesn't really include anything of considerable value. I think it would be an immediate 10/10 if they included two batteries. The OEM battery MSRP is absolutely ridiculous considering the battery management is outboard, it's basically three cells, some wire, and terminals. I'll probably order some third party cheap-o packs, burn them out, rebuild one with quality cells (you MUST have a UHi resistive welder to do this, do NOT try to solder cyl cells, there is an extreme explosion risk), and use the terminal interface on the second with a considerably larger DC umbilical to use with half day projects. Recommended, 9/10

This works well. Even my friend who owns 3 other fennels was impressed by this particular model. Was able to install the collet and a disc very easily. It charged within 2 hours. And I love the variable speed, especially with the delicate work I’ll be doing so I can have more controlled cuts! Only come with a few discs so you’ll have to bit the accessories that go with this EZ change tool.

I've had this about 2 months. I've used this for drilling holes in sea glass and shells. It holds a charge much longer than my old Dremel (which died). Doesn't seem heavy to me. I love that it is cordless. Charges pretty quickly. Doesn't get hot like my old Dremel 8220. I tried looking at different hardware stores and Amazon - no sales, prices exactly the same.

This Dremel is an amazing value given all the accessories it comes with! The kit includes multiple cutting wheels, a high-capacity battery, a charger, and a storage case, making it a fantastic all-in-one package for any DIYer or professional. Even though it's battery-powered, it delivers plenty of juice for any task. I was initially worried about power compared to a corded version, but this tool exceeded my expectations. The brushless motor makes a huge difference, providing smooth, consistent performance even when cutting through metal or grinding down tough materials. The variable speed control is also a great feature, allowing for precision and versatility across different projects. Plus, the EZ Twist Nose Cap makes accessory changes super quick and hassle-free. Overall, this is a top-notch rotary tool with the convenience of cordless power and no compromise on performance. Highly recommend for anyone looking for a reliable, high-quality Dremel!

I used the same Craftsman rotary tool for 30+ years and went through several sets of brushes to keep it going. It was a good tool but I wanted an upgrade to latest technology. This new cordless, brushless Dremel is sweet. Immediate stop with off switch (the old tool had to spin down to a stop), the nose cap has an integrated wrench for the collet (no need for that little wrench to change bits), it maintains its speed even with heavy pressure (the old tool would slow down and stall under pressure). And of course the obvious, no cord and no more replacing brushes is a plus. It's bigger and heavier then the corded one, but that is what a battery does to it, its a trade-off. But, I was able to use it for some cutting and sanding without too much fatigue in the fingers, and didn't bother my wrist at all. So will this new one last 30+ years? All I did to the old one is replace brushes three times at $3 each set. Will this battery last 30 years? Will a new battery cost more than $3? Will they still make this model battery? The old one was just a motor and a simple variable speed control circuit. The new one has and electronic speed controller to generate the rotating magnetic field for brushless operation. How is that electronic speed controller going to hold up over time, or will I need to change out a circuit board in the future? But the model 8250 has a limited lifetime warranty so that's good. I'm probably comparing apples to oranges, but it is interesting to think about. Definitely a good upgrade.

Wow nice to have a Dremel tool WITHOUT having a cord and the battery held up .. no complaints

Pros: - being cordless is so helpful, and the battery does seem to hold a charge for a good while (unlike my Versa that I have to fenagle just to stay charging and only lasts about 15-30 minutes tops) - runs fairly quietly compared to older models - shows you approximately how much charge is left and lights up with speed - doesn't bog down very easily Cons: - as mentioned by another review or two, it is shaped a little on the clunky side. While the tool itself is pretty light, the battery has a little weight to it. This isn't uncommon in smaller battery tools. What makes it awkward is it's advertised for use in things like detailed etching etc. It has a small grip area towards the top like you normally see, but then it's roughly 2-2½" wide, around 9½-10½" long, and all the weight is on the bottom, which makes it weird trying to hold it balanced enough to maintain even control. - this is kind of the biggest issue: or has very little in the way of vents, and I don't know if it's the way they're angled or what, but all the dust and saw dust gets sucked right up in there and there's no way to really clean it out without voiding a warranty. This stuff builds up in there and can cause the bearing to shift slightly. This shift is just enough to offset the centering of the collet, create a tiny wobble in the shaft where the mandrel goes, and make significantly more noise and vibration. ^^ This wasn't an instant thing, though. It had been used for roughly 8-9 months before this happened. Overall, it's a good replacement of you're still using an older plug in model of dremel.

Best investing ever

This tool works great for trimming my dog's nails. It has lots of power so I can run it at the lowest speed when trimming without it stalling out, and at that speed it is so quite that the dog doesn't even react to the sound. The previous tool I used had to be run at 15000 rpm versus 5000 rpm for this one, so that it would not stall out when trimming. This tool is a bit heavier than my previous one but is easy to hold once you get used to it.

Users outside the US and Japan need to purchase a separate 220V charger; otherwise, the battery will not charge.

部品取り付ける用の軸が添付されていなかったので、付けられないですです。 パワーは、Dremel 4000よりあるみたいです。 予備バッテリーを探しているのですが、どこにも無くて困ってます。

El producto cumplió con lo que necesitaba es de excelente calidad

Product material looks poor and the indicator lights are like cheap products. Better to check for other alternatives before deciding to buy this