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Unfortunately, I think that you have fundamentally misunderstood the task suitability of cordless tools - they are designed for short period, intermittent, relatively low power requirement use, e.g. drilling masonry, drilling wood, sawing smaller section stuff, planing-in doors (up to about 2 or 3mm), etc This is certainly NOT what you were doing. I use a cordless grinder regularly, but TBH it often gets used for minor trimming back tasks (such as pinging off soffit nail heads, cutting single threaded rods, etc) and for the odd bit of rakng out of mortar. I don't expect it to run for hours, even on 5Ah batterieseta said:The dewalt cordless angle grinder i purchased just recently , 5Ah battery was flat after cutting through 8 10mm bolts with a 1mm disc , so not impressed, my son-in-law wanted to grind some concrete high spots in garage and only lasted 10-15mins - But i have a corded bosch so fall back to that, but fell i wasted £145 on the grinder-
Yes, single battery 18 volt SDS drills are generally in the order of 1 to 1.2J. However, this is good enough for 90% of the work most tradesmen will undertake in terms of drilling, given that people are mainly drilling into soft to medium brick, blockwork and lower strength concrete and that the majority of holes for plugs and the like (the most commonly installed fixing) will be 5.5 to 8mm (for red and brown plugs). For that a single battery 18 volt cordless will work well. Go up to, say, 14mm holes for resin anchors and start drilling into heavier stuff like blue brick and your cordless will be slower than a high powered corded drill and it will use more batteries, but it will still work. It will also do some light chiselling, but for the heavier stuff you are better off with a purpose made breaker - even if it's a case of hiring for the weekend. Given that you aren't normally drilling dozens of larger holes at a time or into extremely hard materials, a decent battery charger and a couple of 5Ah batteries should be enough to keep most folk going without interruption (other than to swap batteries) during the day. This is the sort of task I perform regularly with a cordless Makita SDS (this week, for example, I installed 20 resin anchored retaining straps each on three 12mm bolts - so 60 14mm diameter x 120mm deep holes - into hard red brick with a cordless SDS in the course if a day, all without the need to lay a 300ft cable to the nearest power source). In fact I gave up carrying round a corded 2kg SDS nearly 5 years ago simply because a "gutless" 18 volt brushless SDS could do the vast majority of the corded tool's work without the additional hassle of dragging cables to and fro or setting up a gennyI also use a SDS dewalt corded , as i wanted the J to be higher , mine is just under 3J and i noted the cordless are much lower,,
And we are talking inappropriate tool (cordless SDS) for the task, yet again. A cordless SDS drill is fundamentally a drill and not a breaker. If you need to go hacking out great lumps of concrete or masonry even a corded 2kg SDS isn't going to be ideal for the task as it hasn't really got the power. If you need cordless to do this then the only way is to go 36 to 54 volt and have loads of spare batteries to get the duration. Even this technology is relatively recent, having only been available for 3 or so years..talking to the sparks & Windows guys using for cutting walls , both found the cheaper SDS cordless not great and both upgraded to a very high price model
Do you have the model or a link to these please I’m looking for a decent pair.i gave up 4 years back, buying a pair of (so far) trouble free deWalt folding stands - pricey but uber reliable, probably because they have far fewer moving parts. Stronger and more rigid too
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