Question about running two Calibike batteries in parallel

[hackerboysf]

I have two 48V, 10AH Calibike batteries with BMS built into them. Each battery has a built-in plug for its own charger. I am putting the batteries onto an electric gokart I'm making with my kids, which is run by a Lyen brushed motor controller.
I would like to wire the batteries up in parallel so that the gokart has essentially 48V and 20AH capacity. My question is this:
If I have the batteries wired in parallel, can I plug both batteries in to their respective chargers, or will I risk blowing up one or both batteries? If I cannot do this with the batteries as they came "out of the box", could I put a big diode onto the "+" leads from the batteries to prevent current going from one battery into the other?
What I'm aiming for is a safe, simple and fast way to charge the batteries. I figured it would be faster to plug both battery packs in to their chargers, but they weren't cheap and I'd hate to destroy them by doing something dumb. I could put some switches in place to isolate the batteries during charging, but kids (of all ages) tend to forget stuff like that. Since both batteries have a BMS and a charger, I thought it was logical that this issue might have been anticipated and protection built into the BMS.
Any input is much appreciated.

 

[mlt34]

You've got it right about the diode. That will keep one pack from charging the other and possibly damaging it. Here's a screenshot from Ping's user guide about running two batteries in parallel. His whole user guide, which can be helpful for general battery wiring, can be found here: http://www.pingbattery.com/usrguide/Wiring%20Guide%20V2.5.pdf