u/Guilty-Promotion-652

I've looked at various articles online, but I cannot determine what the appropriate fast external charger, if any, is for a Roomba 105 battery. I have two Roombas 105 that I'm using right now, and unfortunately, neither can charge the different areas they are assigned to in a single battery charge. The charge does not have to be super fast, but anything that is faster than the dock and the rather lengthy amount of time it takes to recharge a battery now in the robot itself would be helpful. Thank you ahead of time for your kindness and your knowledge.