Dunno about the Flex charger, but the Makita quick charger takes 45 minutes to fully charge a 5Ah. I can`t find info on how long for a 6Ah, but I`m guessing about an hour. With only 25 minutes of run time you`d need more than 2 if you wanted to use it without breaks. I`m looking at a 298Wh battery bank on Amazon. My math is horrible bad, but I think I could charge 3 batteries before having to recharge the bank. But even if I had 3 batteries, that`s still not going to give me a ton of time. For me to use it mobile, I`m going to need a bunch of expensive batteries and a way to charge them. The flex has much better battery life, but I don`t like the batteries that only work with that one unit. Plus, there`s no multi battery
As much as I want a cordless polisher, it`s going to be super expensive to get a setup that would allow me to one step an entire car in a single session. I see Amazon has generic 9Ah Makita batteries, and like was mentioned in this thread you can get adapters. I was looking at the 12Ah Milwaukee`s, they look like they would be too heavy and bulky to use with the Makita polisher, but I don`t know. And I would imagine even with a fast charger, the 12Ah battery would 90 minutes or more to charge. So