Large Scale Central

How many folks permanently or semi-permanently install

Electronics Power and Sound
#21

if you use a charger that is for Li-Ion batteries and get cells with the built in over charge/discharge protection circut you shouldnt have much issue…shouldnt is the operative word. A man you may know or heard of…Bill Canelos…did a rather extensive test and write up that he posted on another board…his experiance with Li-Ion has been pretty good and the artical is very informative …if it is permited and I can find it, I’ll post a link to it or I’ll see if I can get him to repost it here.

Later all…Gerry

#22

Whilst I have a great deal of respect for Bill, he says he solders wires directly to the untabbed cells. That is a definite No No for any chemistry. Welding connections, yes. Soldering to cells, no.

If you must solder it should only be to cells with proper solder tabs.

#23

I have soldered to tabless cells for over 10 years while in the r/c racing hobby…not just NiCad’s and NiMH’s but LiFe, lead acid, and sub c LiIon.

Granted, care must be taken

Later all…Gerry

#24

Gerry Gray said:

I have soldered to tabless cells for over 10 years while in the r/c racing hobby…

Me too

#25

When you heat up a cell such that solder will flow and stick, you also heat up the internals. Doing so will shorten the life span of the battery.

Soldering to a welded tab prevents that happening beause the tab heats up and cools quickly.

#26

(http://i28.photobucket.com/albums/c243/John_FFR/Operation_Crossroads_Baker_resize.jpg)

#27

Sorry…had to do it

#28

cant explain how hard I’m laughing…good one Rooster…sorry Tony…it is funny

#29

I’ve soldered directly to Li-Ions when I didn’t know any better. Since then have done much reading and pay extra for tabbed cells. I also use a heat sink on the tab while soldering. Took a pic last night but it’s home and I’m not.

#30

I solder directly to them, but I sell them to airlines.

Seriously, I directly solder to them when I have to, I usually recycle laptop cells and usually I can preserve a short section of the spot welded tab.

I am good at soldering (taught by professionals) and a hot iron, clean metal, right flux can make a connection pretty darn fast.

That said, I NEVER recommend this to anyone until I believe they can do the same, normally by personal observation.

Greg

#31

I put the plug in and charge away. I dont worry about a fire. Think about how many cell phones and computers are charged daily. How many fires have we heard about? As long as you use the proper charger why worry.