Our cells come with a Nickel or Copper slice
factory installed for easy solder
You do not need any special solder, just regular
solder for use with electronics.
You can use foam or double-sided sticky tape from 3M to leave
some room for the air to circulate.
The way I put together a 3S pack is I take 1st
cell apply 4 strips of foam tape to each corner,
and pull back + tab away from the center.
I grab the 2nd cell and I pull away the - tab
immediately after soldering the two tabs that are left in the
middle (1st - and 2nd +) cover the soldered tab with electrical tape.
add foam tape again to
your pack and pull away - tab before adding it to the 3rd cell and
solder together the 2nd - and 3rd + immediately cover
soldered connection with electrical tape.
Now you should have a
- and a + on each side. Add a little solder to those tabs. I always add another
piece of tape under those tabs before I add a connection wire.
Now cut the red
and black (or blue) wire and strip one side only.
Place some electrical
tape over the + (red) on the other end of the wire just in case.
Add solder to striped wire and solder the wire to the tab at
90* angle and fold over to the outside. Now do same for - (black).
After you get both wires soldered in, wrap the top with tape
and add a connector.
Strip, solder, and heat shrink one
wire at a time, Its important to heat shrink the connector side one
at a time because one slip of hand or solder iron and you can get a nasty spark
or fire. The whole idea is to put the pack together without a spark
Please do not solder a pack at home, do it in a garage or
better yet outside (if possible). And most important read up on safety at
rcgroups.com before attempting to solder a li-polymer cell
WHEN MAKING A 2P OR 3P PACK,
FIRST SOLDER ALL POSITIVE to POSITIVE and all NEGATIVE to NEGATIVE. Then Install as shown above.
NO MATTER HOW MANY CELLS YOU
HAVE IN PARALLEL THEY ALL BEHAVE AS ONE CELL. AND MUST BE CHARGED AS SUCH
FOR EXAMPLE: 3S2P PACK (BUILT
WITH TOTAL OF 6 CELLS) WILL BE CHARGED AS A 3 CELL
FOR EASY BALANCING IT’S BEST
TO INSTALL CELLS IN PARALLEL FIRST, THEN IN SERIES.
INSTALLING BALANCE CONNECTOR:
SMH250 is by far the most
common used balance connector. It is used by majority of Li-polymer brands both
in S.Korea and
TrueRC packs use SMH250
connectors and here is the schematic for sequence wiring of the balance connector
for different Voltage packs
Here is what a 6S looks like
HERE IS THE ELECTRICAL SCHEMATIC FOR SOLDERING SMH250
THE MATING CONNETOR FOR SMH250 IS CALLED SMP250