Sanyo UR18650FM4 Batteries

[Bob K]

I received a lot of Sanyo UR18650FM4 cells today. It was a trade for services received.
I would like to make up a 48 V 20A battery pack for a bike, but I don't know where to start.
I have soldered-up a lot of NiCads and NiMh cells with out any problems and soldering is my
only way of making a pack. I have no charger or BMS or CPB. Kind of a clean slate.
Quite honestly I don't know what I have here. The cells have a faint printing on the side.

" C "
NLCM4E9
124971

The bottom has a printing:

4 NLCT1

There was a tag that had the numbers 091212-9

Does anybody know what these identifications mean? Any help is appreciated!

Thanks! Bob K

 

[Hillhater]

Have a look here...
http://www.dampfakkus.de/akkutest.php?id=122
from...
http://www.dampfakkus.de/liste_akkus.php

Be very careful with the soldering to avoid damaging the cell internals.

 

[Bob K]

Thank you!

 

[Bob K]

This is my 40 watt Hammer Head iron. It has not yet touched a lithium battery ,yet.

 

[district9prawn]

This is my 40 watt Hammer Head iron. It has not yet touched a lithium battery ,yet.

Hammer head is perfect. If you have soldered other kinds of cell types before then you will not find these any different.

I would recommend using plastic brackets to hold the cells together in a pack. Like these. http://www.fasttech.com/products/0/10004028/1290405-diy-18650-battery-holder-case-box10-pack

Cheap and widely available online.

 

[Overclocker]

look for the EMBOSSED code on the plastic wrap. not printed w/ ink. may be a bit difficult to see

 

[Bob K]

Thank you gentlemen.

I did not know about those nice spacers. I like them a lot!

I looked for the faint embossing and found it was marked : Japan 002A
4 year old cells?
Also, they do have the Teal colored ring around the positive electrode.
( if that means anything )

 

[999zip999]

Look at Doctorbass and DrAngle builds threads for ideas and help. Would help to know more about these cells ?

 

[Bob K]

The only other ID I have is a loose scrap of paper that had written on it:

T-901-983-00

So, all I can figure out is that I can use them at 2.5 amps ( 5 amps intermittent) .

 

[999zip999]

What controller amps and motor ? And what terrain ?

 

[Bob K]

Actually, I have enough cells to power my custom skateboard and a high powered bike.
I am thinking of starting with the 450 watt/24 volt skateboard first. ( pretty flat terrain)
I am thinking of 6S6P for the skateboard. I have to study up on BMS boards though.
These cells seem to be really nice and I would hate to damage them by my inexperience...

 

[999zip999]

Battery manement system, cell balaning, hvc,lvc ect.