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🔗 Quelle: hackerpublicradio.org
HR000000000
H Hybrid: Denotes some prepurchased or hard to find components
R Robotics: suitable for robots
buy: 4s 40A BMS
https://www.aliexpress.com/item/4000025857655.html
(can't specifically vouch for this vendor, just chose the first that
came up)
make sure to choose 4s and balance
find or buy materials: duct or gorilla tape, trashed computer dvd or cd drive, 20 18650 cells, molex connectors(you can also use barrel jacks or whatever you want to transfer power), wire and maybe 'tab wire' https://nl.aliexpress.com/item/32650006768.html
solder everything together as per schematic and pictures (there is theoretically a danger in soldering cells, but I have never had a problem. Have a pair of pliers and a nearby window handy to throw them out of if anything goes wrong)
wrap in cardboard and tape as per pictures
add the cd/dvd drive lids(if you taped well you won't short anything and burn your house down
tape dvd lids to battery
Getting into the battery for maintenance just requires a utility knife.
Watt Hour does a great job describing the 3s BMS, which is very similar to the 4s used in my case: https://yewtu.be/watch?v=QNENyu97w2A
Battery Schematic
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thumbnail to see the full-sized image
Cut through tape to reveal battery
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image
Flat metal holds cells together
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image
Detail of 4.2v
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to see the full-sized image
Only have to desolder one side
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the thumbnail to see the full-sized image
New cells in
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see the full-sized image
Make sure there is thick tape covering battery
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image
DVD drive case for stability
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the thumbnail to see the full-sized image
Tape the DVE case to battery
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the thumbnail to see the full-sized image
Charge board with Molex connector
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image
Outdoors 1
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see the full-sized image
Outdoors 2
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see the full-sized image