2 car batteries what in parallel? you mean connected together? i am not to great with electronics. I know the basics thats about it. Ive never messed with car batteries thats why Im posting.
before you start gettin rowdy there buck, i would never pay close to a grand for a charger!! c'mon now. i only got it because of the amazing deal i got. it couldnt be passed up. in great condition for $200. It just needed a firmware update.

repeat post: Can someone answer post #9 for me? still hasn't been answered

2 12V batteries in series gives you 24V, the exact same output the Meanwell power supply gives to power your charger. Connecting your charger directly to the batteries wired in series is the most efficient way to charge.

A suitable case for the 4010 is ~$150, the charger itself is $350, a power supply capable of supplying enough power to charge is ~$250...thats $750 right there. Add in all the other miscellaneous hardware and wires should be close to $1K. ProgressiveRC sells a 4010 charging case for over $1k. $200 for everything is a very good deal.

your 4s and 6s packs requires 241WH oh power. your lone 5s 5000mah pack only has 105WH. You would need at least 2 of those 5s pack in parallel to provide enough power to charge your 4s and 6s once, assuming you arent charging a completely empty pack.

thats one of the things ive wanted to figure out. how do you quickly calculate Wh?

Voltage x Capacity

Power = voltage x amps

6S = 25.2v, Charging with 10 amps = 252 watt. -> from a 12v power source you will draw 252/12= 21 amps

If that takes 30 minutes to charge -> 21 amps x 0.5 hour -> it takes 10.5Ah from the battery (losses not calculated.)

That's a mild/optimistic way of putting it, to be honest. Everything discussed here is actually nothing but the absolute basics about electronics and it's also only absolute basic math. The problem is, you don't really have an idea of how any of this actually works, but what you do have is a set of ideas you seem pretty much stuck to. You even reject answers outright (just because you don't want to hear them, since they don't fit your previous plans) and ignore options flat out, even when they might be your only way to achieve your goals. Now don't get me wrong: not knowing things is perfectly ok, and people here are ready and willing to help (up to a point - and attitude does have an influence on that point), but you need to be ready to accept what people with more knowledge try to tell you, even if it's inconvenient, and may require a change of plans or even total rethinking on your part. Even inconvenient things can still very much be true - or even worse: your only option. The simple fact is: there are no wonder solutions. If a decent battery for your application is too heavy for you, so will an equally decent power station inevitably be, as it needs such an internal battery to work. That's all there is to it. You can't create electric power from thin air and you can't store it in thin air. And the more of it you need, the heavier (and costlier) the equipment to create/store it will get.

Really, there's just two questions here that needs to be asked before we literally move forward -- How many times during the day do you plan on charging those batteries you've told us about and how quickly?

He already told us what batteries he wants to charge in this very thread. Not how often though...

Yeah, I only saw two. We need to know if he has multiples of those, if he plans on charging them twice or more, if he plans on charging 2x 4s, 2x 6s, etc.

i hear ya, its a good question. you mean how many times charging the batteries in one field session? you would be referring to the mah of the power station battery I imagine before it dies right? also the more capacity the more Wh it will have right? I know more than the basics in theory, just not in application (experience)

I would start with going to the field or site, and setting up my batteries to charge first wile I set up my cars. i dont want to charge the night before and have them sitting charged up. i want to charge and go. 1 charge cycle for 1x4s and 1x6s at the same time. use my cars until lipo cut off, then call it a day. That would be the shortest scenario. I dont even think i would storage charge because the cut off will be at 3.5v/cell, so no need for storage charging post run. what do you think?

If you want to keep your batteries in their best condition and enjoy them for as long as possible, you should definitely storage charge every time you're done for the day, even from 3.5V per cell.

3.5 is ok but 3.7 or 3.8 is safer, more margin for error and some room for a little self-discharge. Also storage temperature is important, try to keep them out of the heat.​​​​

If all you're planning on doing is running the two cars once, there really is no point in having a field station at all. Charge your packs the morning of while at home, and store charge them at the end of the day.

Plug your power supply into the wall and be done with it.