correct connections when charging

[TerryV6]

My sister followed the instructions when charging her battery. Plug into the AC first, then attach the battery. Every time she did this, there was a spark at the battery connection, and finally the battery refused to take a charge. Someone said that you should connect the battery first and then attach it to your power source. Any thoughts on this?

 

[RunForTheHills]

It seems unlikely the connector sparking caused the battery to not take a charge. That could pit or corrode the connector and maybe the charger isn't getting a good connection with the charging connector contacts. What kind of connector does the battery use for charging? There may be something else wrong with the battery or BMS in the battery. Perhaps she didn't charge it for a long time and the battery dropped below the low voltage cutoff so the BMS won't let it charge for safety reasons?

 

[gromike]

I always plug the battery into the charger, and then pug in the AC. Then unplug the AC before unplugging the battery.
YMMV.

 

[Jeremy McCreary]

There's no universal order. Do what the official manual says.

I have 2 ebikes. One manual says to plug into the battery charging port with the charger already powered up. The other says the opposite.