The "power" you compared really isn't that relative to how well it is going to work. Electric motor speed is dependent on voltage. The vacuum motor is going to be approximately 25% slower at the start, and continue to get slower with an 18v battery. Slower motor = less suction. The current rating on the battery can never be "too powerful." The device connected to the battery will only draw what it needs. The amp hour rating is really just a measurement of how long the battery will last. It would be much better to use a 24-volt battery, but obviously what you have will work and it will likely last longer than the original battery. You're just sacrificing some of the suction. Good video, I'm going to do something similar.
The best thing about these Ridgid batteries is that they have the battery management for over discharge protection in the battery unlike the other major brands (dewalt, milwaukee, makita, etc. all have the BMS in the tool). The only other manufacturer that I'm aware of that also does this is Ryobi (also owned by TTI) but their form factor doesn't lend itself well to DIY projects.
I plan to wire three 18 volt Rigid batts in series to power an EGO power tool. Need to 3d print mounting and switch - working on that. Hope 54 volts is sufficient for the 56 volt tool.
I think you have gotten lucky with your numbers. You have mixed up energy capacity of the battery (Wh) with power (W). The machine will draw whatever current it needs. Just because you are using a 4Ah battery does not mean the battery will supply 4 Amps. For instance, your 4Ah battery is rated for being able to supply 4 A for an hour before the battery is considered empty. It could supply 16Amps for all we care for, as long as it doesn’t overheat, but then it’s likely to only last 15 minutes. (Actually very likely the case in this setup). So what’s my point? Comparing the watt-hour capacity is pointless. In this case, what matters is the battery being of similar enough voltage (which you’ve got lucky) and being able to supply the current needed. And your tool battery is more than capable of that. And the reason I mention it is because people might think it’s fine to use a much larger voltage, but because the Ah rating may be lower - which is dangerous. I stumbled across this post because I’m planning on building my own battery pack - and it’ll be the full voltage, but I plan on something like a 12Ah capacity - so the thing lasts more than 15 minutes on full power. (So my Wh rating will be well and truly beyond the original - but that’s immaterial, because in this case I just need to match the battery voltage and make sure my battery will be able to handle the current draw, which it will). Please be careful with your instructions. If you are not 100% sure of the theory here, you really shouldn’t be trying to give a lesson on it for others to follow. Dangerous.
I don’t use it for ling periods so can’t tell. I use it to pick up things off the kitchen floor, dead bugs in the basement, etc. I don’t think it will last more than 30 minutes of continuous use.
Here is one I found on ebay. www.ebay.com/itm/373711648582?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D245022%26meid%3D0deb40b42f3345f2b68d739739d21402%26pid%3D101195%26rk%3D5%26rkt%3D12%26sd%3D125543796874%26itm%3D373711648582%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv11WebTrimmedV3MskuWithRevOptLambda85KnnRecallV1UpdatedPrice%26brand%3DUnbranded&_trksid=p2047675.c101195.m1851&amdata=cksum%3A3737116485820deb40b42f3345f2b68d739739d21402%7Cenc%3AAQAHAAABIATTvUhf9weceaKbX5LvBjvPjEhDzrCECR1YF2hmJp%252BY3cKnSDVzdwt2NHzOMyyyOoavCkbiJbFyLOYBO2W7CrFs8F3wGZ9lriP2YJm81zysV5mxiV55vcUciQihAaU9v%252BTQ1Vr9ESZdBieW14nbfWyRmPxguRprRXwR4piaaHYW3aSKzp9KWqH0Sn2H8B9LPOVKmYH6E18ss6bMVOnQJSV1yAy9a1JSnT2Vn3ni0mjwNeUQOZl7MTg6qQoiEAPA%252BdUszizWiRyA%252FrPS6N3XL2nmQl%252Brw12sarmH8Vhm2jbQNcIAOJnaVy7%252FkU0g68eqpqLd2tBvoZWIPZ399GaTxa2FIbRHWdRcvli5P7SA39%252BPtEk9f1dLFDwUSHSNh%252Fbe%252FQ%253D%253D%7Campid%3APL_CLK%7Cclp%3A2047675, but it is more than what I paid.
Seems like your math aint mathing you are confusing Watts (W) with Watt hours (Wh). Wh as no impact on the performance of the tool. If I put in a 700V battery that is 0.1Amp it will be 70Wh, pretty close aint it? But man you should see the sparks if u ever turn it on
Perhaps the math is off a bit but no issues in using this for over a year. Most recently, I ran it for more than 20 minutes non-stop. the one thing I will say is that if I leave the battery connected to the vacuum, it drains overnight. So I just don't have them mounted. But no sparks or heat.
