My first home made box (SX350 50W)

[macedonianlion]

Like i sad i still have the SX350 100W and same problem i have, i can't decide what batteries to go with, coz i don't want a box bigger than a hana dna30 box, so when i figure out somthing that can fit in a smaller box and can chage it with bateries incide the box ill start building again
But to be honest even this one i have now is overpowered, i havent uzed it once obove 35w, only tested it and i just upgraded the chip today to 60W what i probably will never go to

 

[the mutt]

Lipo can be nice and small, if you look at component shop (.co.UK) they give the dimensions etc and can come in very little dinky but powerful packages and I am sure there is a charging chip that can deal with them.

 

[Raguri]

Hobbyking
You want a 2s
And a balance charger

Do not try and charge two 18650 in series using a usb charger.

 

[macedonianlion]

Hobbyking
You want a 2s
And a balance charger

Do not try and charge two 18650 in series using a usb charger.

No, no im not that newbe to elecronics, actualy im electronic mechanic, my only problem i to find a small balance charger somthing like this BD244 Transistor Li-ion Lipo Battery Charge Circyit Balancing | Electronics Projects Circuits, even smaller to fit in a small box with 2 18650 in series and the sx350

 

[Raguri]

No, no im not that newbe to elecronics, actualy im electronic mechanic, my only problem i to find a small balance charger somthing like this BD244 Transistor Li-ion Lipo Battery Charge Circyit Balancing | Electronics Projects Circuits, even smaller to fit in a small box with 2 18650 in series and the sx350

Do what I'm doing with the box being made for me, have a removable door and charge it directly from the balance lead ?
That way, doesn't matter if it's none removable.
Doesn't take long to charge a lipo at all, and they last ages compared to conventional cells.

 

[Chegs]

Lipo balance charger takes my 6600 mah x 2 (total 13200 mah )an hour at most to recharge, with charge set to 5A. Used to use a little USB charging board in my 4000 mah box and that took upwards of 8 hours to recharge. I'll run this latest configuration (added 2 more 2200mAh cells to my box mod earlier)and see how many more hours I get with an extra cell (the 6 cells are wired in 3 parallel, 3 series for 8.4V )although preliminary tests show the extra cell has reduced the already minute voltage drop.

 

[Jackson]

... next will be the SX350 100W but have to find a way to charge the bateries without takeing them out of the mod

The best way to charge a series stack (8.4V) is with a balance charger.

You'll first need to pull and extra lead.

Balance chargers can be expense, but there are reasonable ones out there.

HobbyKing® B3AC Compact Charger

He's another for a bit more.

Turnigy 2S 3S Balance Charger. Direct 110/240v Input (UK Warehouse)

There are many out there.

Amazon.com: Traxxas 2935 2-3 Cell LiPO Balance Charger: Toys & Games

You'll need the appropriate cables and connectors (3 wire). With a series stack the cell you pull your negative lead from will often discharge more than the other and as cells age they will also discharge differently. The third lead (which monitors and adjusts the voltage difference between cells) of the balance charger will enable both cells to charge perfectly.

There are 2 wire chargers out there which output 8.4V then shut off when the pack gets there. But these are made to be used with some sort of a protection circuit to prevent overcharging one of the cells. Note 4.35 + 4..5V = 8.4V.

 

[johnsoncook1024]

well done,mate!

 

[blademansw]

Very nice!