If you buy a single 48v battery, it's pretty much just drop in, connect the wires and go. Nearly all the batteries come with the BMS built in that will connect to your phone via Bluetooth, no computer needed.
You will need to buy a new charger although some lead acid battery chargers can be reprogrammed to charge lithium batteries.
If you go to Amazon there are many different batteries and kits including the charger listed there and Prime days are coming up in October. You can get a lithium kit for around $1200 and up, sometimes even less.
The only other thing I have seen is that the wires that connect to the battery and motor should be 4 gage.
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