![]() If you've ever used a circular saw ("skill-saw") and stalled it, you may have blown the fuse/breaker and wondered why. The ohmic resistance of a drill-sized DC motor is quite low. It's actually not mainly a resistive load. Two options are 3d print a suitable battery case or vacuum form one from plastic sheet. In this case you'll have to get creative. What do I do if I have a tool that has a plug in battery but I don't have the original battery? Since the batteries are so inexpensive I can also afford to keep several packs on hand. ![]() But I don't really care as I found I'm rarely trying to drive 200+ decking screws from a single battery charge. In the case of my 14.4V Makita drill- yes. Isn't the battery capacity less than the original manufacturer's? Again, you will need a special charger for these batteries. If you can find a pack that fits then great- just be sure to use a pack that either has a built in protection circuit or be sure to use a low voltage cut off alarm. The advantage of these batteries is that they tend to be a bit more durable than LiPo packs but they can be a bit larger so they may not fit inside many power tools. While I used a 2s Li-Ion battery in my son's drill and it works just fine ( I already had this battery pack from a broken RC helicopter that was given to me at home ) LiFePO4 batteries are a better choice. If you are really worried about an overload condition (motor shorting/stalling, etc.) then you can install an automotive blade type fuse on the positive power lead from the battery connector to the tool (not on the battery pack.) These fuses will increase the load resistance so you will have to do some testing to obtain the right value but it should be below the total current capacity of the battery. I've been using these tools for quite some time now with absolutely no negative side effects. If they are treated properly they are perfectly safe for every day use, but it's not something I would recommend if you're using tools on a construction site as they're not really practical for that application. If you're not comfortable handling LiPo batteries and going to the extra trouble of maintaining them properly then this instructable probably isn't for you. There is more info about LiPo batteries and safety here. Here's a good guide to understanding LiPo packs and how to care for them- A Guide to Understanding LiPo Batteries. It takes me maybe ten seconds to plug them back in and since the LiPo packs have such a low self discharge rate my tools are always ready to go.ĭon't LiPo packs require special chargers/procedures? I've developed the habit of keeping the batteries unplugged until I'm ready to use my tools. Won't the battery alarm drain the battery over time? When he found it it didn't have a battery but I knew we could fix it up as soon as we got home so he bought it and he's been using it ever since for his own projects. The mini Makita stick drill is one my son found for $3 at a recycling center. The beauty of these old style drills is you don't even need to take apart the old battery case as the battery just slides right in the grip. I really like the old robust Makita stick style drills- they can be found dirt cheap (or even free) and they hold a decent size battery as well. I have several drills that I've converted using this technique and they all work better than they did when they had NiMH batteries. XT60 connectors (these come with heatshrink)īattery monitor- I really like the inexpensive Hobby King low voltage battery alarmģs (11.1V) or 4s (14.8V) LiPo R/C battery pack- Hobby King sells lots of different LiPo packs so pick the one that best matches your tool's voltage and available battery space Mine is an analog Pace ST30 which I purchased used for $100 (I had to look for a long time- new is about $260) The digital version is the ST50 model.ĭremel tool with cutoff wheel (a narrow bladed saw will also work and cuts cleaner)īattery charger- I really like the Hitec X1 Multi-Charger as it's a smart charger can handle most any battery chemistry but any charger capable of charging multi cell Lithium batteries will do Soldering iron- You could use pretty much any inexpensive soldering iron as this is a very easy job. Wire stripping tool- I really like this inexpensive wire stripper
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