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I would like to pick your brain on how you did yours.
18650s to scooter batteries.... I am not really sure what the hell is going on.
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Yeah it's a bit much at first. 18650 batteries are the common go to because they're in a lot of things. Some of the server batteries are actually a better, especially if you
Really what it comes down to is that you need to figure out first what the power demand is for whatever it is you are trying to power. Figure how much run time you want it to go for to determine the battery pack size you need. Then you figure out how to power your device. Factor for any inefficiencies (I.E. inverters) and losses (cable lengths and gauges based on voltage)
Don't have a good way to draw out a diagram right now but the long and short of it is
Power source in --> charging controller ---> battery management system --> battery bank --> voltage regulator/inverter --> device you want to power.
Holders for the battery cells can be purchased online, same with the heat shrink. To do it right you need a spot welder and nickle strips. There are solderless/weldless holders with bars but they cost a good bit more. Depending on the project, and size constraints, you may want to buy the welder. Don't try to use a soldering iron/gun.
Additional things you may want temp controlled DC fans to cool the batteries. Displays with current, voltage, temp, etc. Various plugs/terminals to hook up everything. Dedicated smoke detector with fire suppression system (sounds fancy, but it's a solenoid controlled fire extinguisher basically). Remote monitoring devices (smarthome type stuff) for power draw/charge.
The sky's the limit and you can work on big or small projects. Everything from small electronics to electric skateboards/bikes, motorcycles or vehicles can be done. Just a matter of finding the parts...which for me as a non EE type can be daunting at times.