I am a beginner in setting up my own battery bag and charger to add on more distance and time to my current ebike and use it as a backup.
I set up the batteries properly and added a 3 prong adapter to connect to charger.
I was ready to test the charger and battery to see if it worked but as soon as I connected the three prong charger to the battery without connecting the wall outlet the lights were on the charger.
That is not correct I told myself for some reason I did something wrong, my first thought is do I need a controller? I have seen plenty of ebikes around with battery and chargers and no controllers.
The second possible mistake is that when I connected the three prong adapter I didn't go directly to the tabs but connected to the wires directly.
One or both could be my mistake and I'm here to get advice as to which it might be.
Thanks in advance.
PS: My batteries are SLA not lithium. and its a 36v setup with a 36v charger 1.8amp