I will be putting up a DIY in the coming days on a charging station that I'm working on.  Parts are less than $60 and can be done in less than an hour.  I'm doing some more testing to make sure the battery are charging correctly.  The $60 estimated cost is everything you need.  The picture shows my custom enclosure but it's not needed.  It has built-in over current protection and will not exceed 5A charging rate per battery.  Total output is roughly 15A.   I've tried it on both TB47 & TB48

Rapid Charging Station

This looks interesting. Looking forward to the DIY write up.

Thanks for putting this together...I'm definitely looking forward to the write up.

Wow, this is really impressive.  Would love to see more!  ...does the "DJI Prototype Workshop" indicate DJI involvement, support, or blessing?  Apart from the parts will the enclosure be available too?

GrahamJ Posted at 2015-6-8 21:05
Wow, this is really impressive.  Would love to see more!  ...does the "DJI Prototype Workshop" indic ...

it actually says DIY like in Do it yourself

Really impressive,looking forward to write up.You have spent a lot of time building and designing this unit it is very professional looking.

Please keep us posted, i will like to work on one for myself, regards from Dominican Republic!!!

luismmorales@gm Posted at 2015-6-8 22:50
it actually says DIY like in Do it yourself

ROFLOL....I can't believe I overlooked that!  My apologies.  Must say, using the exact same font (intentionally or not) was clever!

Parts you need:

While I was testing, many vendors on ebay & Amazon are now selling the kit.  One such kit is:

http://www.amazon.com/Converter-Parallel-Batteries-Charging-Quadcopter/dp/B00YP9SPGI/

For $75, you get the power supply and the charging plate.  It is more expensive than buying the parts individually.  But might be worth the extra cash if you don't feel like hooking up the cables yourself.

24V 15A Power Supply ~$25-35 (Adjust potentiometer to 26.3v)

http://www.amazon.com/Switching-Transformer-Regulated-Computer-Project/dp/B00ANFJ26U
http://www.amazon.com/Genssi-14-6A-Regulated-Switching-Supply/dp/B005CLDOW8

Multi Parallel Charging Plate ~$12-20 (They should all be the same)

http://www.amazon.com/Shopready-Parallel-Batteries-Charging-Quadcopter/dp/B00YS6IGFI
http://www.amazon.com/SUMOMOTO-Battery-Parallel-Charging-Quadcopter/dp/B00YH28BI0
http://www.amazon.com/Generation-Multi-battery-Parallel-Quadcopter-Charging/dp/B00YRWCSY8

Spare 3 prong power cable and a male DC barrel plug.  Should have these laying around somewhere but you can get them on Amazon ~$5.

http://www.amazon.com/MassMall-Quality-10pack-5-5mm-Pigtail/dp/B00XTY8WUY
http://www.amazon.com/C2G-Cables-Universal-IEC320C13-Meters/dp/B00007JO37

Cut up the power cable and hook up green to ground(G or Earth symbol) white to neutral(N) and black to hot(H).  Red of the DC barrel plug goes to V(+) and black goes to V(-)  Plug the barrel plug into the charging plate and the 3prong power cable into the wall outlet.  Adjust the potentiometer knob on the power supply until the LED display on the power supply reads 26.3.  The plate seems a bit fragile so I recommend that you plug the battery into each terminal before plugging in the power.  That's the main reason why I made myself the metal enclosure but you definitely don't need it if you're careful removing the battery from the terminal.

The charging plate uses ceramic resistors to limit the current to 5A per battery.  I tried charging 2 TB48 and 1 TB47 and it took about 70min from 25%.  One TB48 took an hour from 25%.  The resistor gets very hot if you only charge one battery at a time because it's limiting the current to 5A by converting the rest of energy to heat.  It has a button that you can push down if you want to use the original DJI power supply.  This will bypass the resistors.  It will split the 100W of power over 3 batteries.  Which will take almost 4-5hr to fully charge 3 TB48.  

The plate has an LED display which will cycle through each battery showing the voltage then the amount of time remaining to charge.  I find the time to be inaccurate.  It will show 26.3 then 000 if the battery is full but the LED indicator on the battery will keep flashing like it's charging but it's actually full.  I checked it by putting it inside the Inspire and it would show 100%  I must have charged over 20 batteries so far and other than the resistors getting hot to touch, it has performed very well.  For the cost of the original DJI power supply, it's definitely worth it and quite a time saver.

DJI will be releasing a charging hub which will also do 3 batteries at once.  Not sure if it will be using a bigger power supply or the 180W one but it should be released next month.  I'm sure it will cost a pretty penny if they're asking $90 for just a 180W power supply.

JackDakota Posted at 2015-6-15 18:08
Parts you need:

While I was testing, many vendors on ebay & Amazon are now selling the kit.  One su ...

How much for your case, can you PM ?

Can you provide a schematic of the charging case. I have all the bits, would love to get it all in a case like yours.
thanks
Jeff

JackDakota Posted at 2015-6-15 12:08
Parts you need:

While I was testing, many vendors on ebay & Amazon are now selling the kit.  One su ...

Hi, i bought parts from china

350watt power supply and multi battery charger. and wire together one cable,  ps to multi charger.

1.problem=cable is 3mm and while charging getting hot.

2.problem=while charging resistors get very hot

3.problem= sometimes while charging first and and second terminal battery stop charging. sometimes all terminal battery stop charging.

4.problem= while charging what V value on led screen show? without battery i set with pot 26.3V - when connect to battery V get low value.

do you know anything about this issues?

Wow, you have so many batteries. That is insane!

Are you willing to build and sell to any of us that are lazy and don't have the time to DIY???? Im very interested .