Ryobi (RSA) 18V Universal Battery Case

thingiverse

I recently purchased a Ryobi battery operated lawn mower, which came with out batteries, it requires 2 Ryobi 18V batteries to function (36V in series) and only having a 2000mah and 3000mah battery for my tools I looked at purchasing 2 to dedicate to the lawnmower of the same capacity which needed to be at least 3000mah to ensure I can at least do half the garden before needing a recharge. To my surprise they cost the same as the lawnmower. Now I have done this search previously, and couldn't find anything that fitted the SA version of the Ryobi, but this time round I found the Xfinity battery holder that was said to work with the SA ryobi version of we have. So, I used @salcedo98 battery skin as a template for the battery interface and with a bit of tweaking here and there, it fits perfectly on the Ryobi range of tools in RSA.I designed a 21700 5 battery holder (for my lawnmower) and a dual layer 18650 holder that will allow for 2 x 5 battery packs in parallel to give you a bit more juice and capacity.I'm using 21700 samsung batteries which are 5500mah currently, the 18650's I suggest you don't buy from your local china mall as they won't handle the current needed by the tools to operate. And obligatory disclaimer below:I do not and cannot be held responsible for issues caused by the use of these printable items. Lithium batteries can catch fire, so use with poor batteries or incorrect charging methods can be dangerous, so use of the items is at your own risk.I only print in ABS personally as I like stuff to last longer than a few minutes when more than a hot day in a SA car is expected on a printed part. I don't recommend using PLA with this print, it won't handle the heat caused by use from the batteries for too long with out deforming and ultimately becoming a risk. This is still a work in progress, and still need to decide how to connect the BMS to the pins from the tool, but there are smarter people than I out there, so am uploading what I have do so far for them to make there way from here. Personally I'm going to use standard lugs heated up and pushed on to the tools battery interface pins, but if you have something better please feel free to share.You'll notice a cut out in the lid that spans most the battery case, this is for a 1s-7s bms I have that I am planning on using after I have used the two smaller versions I am using in the lawnmower packs. This bms is longer than normal but will allow me to sport weld my nickle strips directly to the battery instead of having wires running all over the place internally.Please excuse the quality of my first print, I didn't level my bed so there was poor adhesion and the first layer allowed a bit of warpage to occur due to the length of the print. I do use an enclosure, but poor adhesion will mess with any abs print. And besides, I stuck this on at 3am and decided it was bed time.Thanks to the original designer for his great stl that made this much easier to get done. This is still a work in progress so expect updates as I go along.Edit:26-12-2023Added V0.1 verstions that decrease the space for the pins on the tools and now make contact with lugs.Changed 21700 battery holder moving cooling ducts to the side also making it less prone to warping when printing in abs as there aren't long lines that pull up on the print. Also added a bead around the side to reinforce the slid on top.