You can safely assume that the cells used as OEM's from a quality tool manufacturer have an extremely low failure rate, so that's a non issue. Googling battery specs, temperature limits, charge and discharge thresholds and rates is the easy part. The DW is heavy and a little unbalanced with the big 6AH bat, so I'll get a 5AH and see how it feels with that. However, I preferred the DeWalt for drilling the guide holes for the jig - it just felt more powerful, and I think spins a bit quicker (will have to check the specs sometime). The T18 feels more refined, is more comfortable to use, and the centrotech ability to quickly attach and detach the forstner bit in the Parf jig made the job a lot quicker and easier. I played around with my T18 and the DCD796 while milling my workbench yesterday. So I now have a 3rd battery system on the bench (DW 12 and 18V, and Fe$tool 18V) ![]() ![]() After I reassured him that I did not have early-onset dementia and that I did in fact intend to be standing in front of the Yellow and Black display, as opposed to the Green and Black, he disappeared in a puff of smoke (not battery-induced), rummaged around and came up with ex-promo pack which had the DW impact driver, hammer drill, charger, and dirty great 6AH battery, all for a whole lot less than the current cost of the impact driver alone. I popped into my local tool store, where I have made friends with the boss. Just not worth the effort with current prices. Which for me, falls into the 'too hard' basket. I think the safest way would probably be to have the original circuitry from both manufacturer's batteries in the adaptor, with a physical switch to switch the cells' output between each system. Some are in the battery itself, some in the tools, and some seem to have both. The complexity with these modern tools is how, and where, they are implementing the tool and battery protections. I've been building battery packs with 18650 cells -mainly for my megawatt bike lights - with balancing and protection circuits for years, and am Still Not Dead. But don't try to constrain the rest of the world to your own limits. If you don't understand them, and do not have the know-how to implement these specifications, then don't mess with them. The circuitry and specifications are easily, freely, and readily available. However, they simply have specific requirements for charging and discharging, and are perfectly safe if you meet these requirements. They pack a fair amount of power, which is why things are unpleasant if they are mistreated. WRT to comments on how dangerous these things are - they are batteries. The 6.0AH flexvolts have 120Wh - so the Dewalt batteries have a travel clip that physically changes the wiring and turns them into 3 cells of 40Wh each. You may not ship these little bombs if they pack >100Watt-hours. Needs at least special (professional) packaging and not every carrier allows it.ĭeWalt have been very clever at getting around the battery transport limits - their '18/54V flexvolt' (US 20/60V). On another Note, Bosch's new 18V 12Ah ProCore exceeds limits of what can be shipped regularly. And God beware, something happening to someone else while using/charging/storing self made or tampered with batteries. The $$($$) saved on some batteries or tools, is simply not worth loosing life, limb or $$$$($$) material possessions. This really is no joke and lithium ion batteries are nothing to play/experiment with in my humble opinion. A steel can/filter of a coffee machine looked like someone had hit it with a hammer. You're spot on.Ĭargo planes have crashed, cargo planes performed emergency landings because of "funky stuff" happening with LiIon batteries/cells on board.Ī long time ago, long before those crashes, someone I briefly knew posted pictures of the aftermath when a lithium ion battery had exploded in his kitchen while charging. DeWalt does have a lot compatibility within their family, some of the chargers can accept both their 12 volt and their 20 volt packs, the 60 v packs shown in the video clip can be used on 20v tools and the chargers take both (60 and 20) batteries. Given the cost of my Festool stuff, I'm not inclined to experiment with it. Otherwise there is a lot of risk of blowing up the batteries. ![]() They don't document any of that, so mixing successfully requires a lot of tearing things apart, and a lot of knowledge of what all the stuff you uncover is. While adapting is theoretically possible, and does work in limited cases, some manufacturers put the battery control circuitry in the tool, while others put it in the battery pack, and no doubt, some others do something in-between. Now I have 2 Festool, 2 Bosch, and still have the DeWalt. Up to a year ago, I had two battery/charger types, DeWalt and Ryobi, I retired all the Ryobi stuff, but in the meantime I added some new. Build a charging center to organize them.
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