RunRyder RC
WATCH
 1 page 2520 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › How to build a 7S1P A123 battery pack???
06-18-2009 03:04 AM  11 years ago
Topic Vote0Post 1
Ironside

rrApprentice

Baltimore, MD

MyPosts All Forum Topic
How to build a 7S1P A123 battery pack???
Can someone provide instructions on building a 7S1P A123 pack. I've never soldered batteries together so it will be a new challenge for me. I am looking for how to configure the tabs on the battery. Any and all help would be appreciated
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 04:49 AM  11 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
Top half of the picture below shows a generic SERIES wired set of batteries...7S would be seven batteries wired as shown

One method of hooking them up -- this is an 8S pack, just leave one cell off, you'll have a 7S pack:

Another way to skin the same cat, again an 8S pack shown, leave one cell out for a 7S setup:

That's the easy part. If you've not soldered before, especially batteries, it's going to take practice and the proper tools (a hot iron that can get in and get out quickly without dwelling on the battery waiting for it to heat up), something to hold the batteries in place, and lots of patience.

If your cells have solder tabs, that will make life easier.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 01:18 PM  11 years ago
Ironside

rrApprentice

Baltimore, MD

MyPosts All Forum Topic
Thanks dkshema

That actually makes alot of sense. Not sure if this something I will try with A123 cells for the first time, but its something I want to give shot with down the road. I will probably just have to find someone to build it for me when I get the cells. Do you happen to know someone that is good at soldering batteries and would be willing to help me out?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 01:56 PM  11 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
I make packs like this for myself pretty often. It's not all that difficult.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 02:33 PM  11 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
I've not dealt with A123s, but I'm told that some of the smaller cells have steel cans and are pretty easy to solder to, but the larger ones have aluminum cans, making soldering for the average Joe difficult.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 02:49 PM  11 years ago
copperclad

rrElite Veteran

NY

MyPosts All Forum Topic
Hi
i am not sure if this link will help , but there are some other links listed in it that cover building A123 packs
http://www.runryder.com/t394928p1/
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 03:46 PM  11 years ago
Ironside

rrApprentice

Baltimore, MD

MyPosts All Forum Topic
Thanks alot for the info. I may give it a try (haven't decided). This is the configuration that I'm shooting for:

It will be installed in my Trex 500. In this particular config, would I have to solder the batteries end to end or just place them end to end and then tape them together or what?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-18-2009 04:33 PM  11 years ago
copperclad

rrElite Veteran

NY

MyPosts All Forum Topic
Hi ironside
with a 500 rex you will want to have the 7th cell on the end of the pack , so the canopy will fit , i lowered the battery tray also
the batteries will need to be soldered together ( my cells had tabs ) , and you are going to want ballance connectors for your charger , there are a few other photos in my gallery showing the canopy fit

SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-19-2009 02:42 AM  11 years ago
Ironside

rrApprentice

Baltimore, MD

MyPosts All Forum Topic
Did you make the pack yourself? How difficult was it?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-19-2009 11:17 AM  11 years ago
copperclad

rrElite Veteran

NY

MyPosts All Forum Topic
Hi ironside
yes , i bought a Dewalt pack and ripped it apart for the cells , they are tabbed cells which makes it easier to solder , but i also added balance connectors for my charger

here is a link to a company that sells 6 cell packs http://www.bphobbies.com/view.asp?id=C2116942

my friend fixit here on RR , bought a 7 cell A123 pack through E-bay , i will PM him and get you the contact info , cheers
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-19-2009 11:45 AM  11 years ago
Fixit

rrElite Veteran

UK

MyPosts All Forum Topic
I had these people make me a 7 cell A123 for the 500 and I can say I’ve been very pleased with it and the price up to now.

http://cgi.ebay.com/7S1P-A123-22-4V...34.c0.m14.l1262
I only like to fly gassed up
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-19-2009 12:00 PM  11 years ago
Fixit

rrElite Veteran

UK

MyPosts All Forum Topic
Dana, the shrink on yours looks more like rubber than hard plastic, have you got a link for this?
Cheers
I only like to fly gassed up
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-19-2009 12:09 PM  11 years ago
Ironside

rrApprentice

Baltimore, MD

MyPosts All Forum Topic
Thanks FixIt. I will send them a message to see if I can get a couple of packs. How long did it take you to get the packs? I noticed their auction stated 4-10 days. Also did you use the same configuration as shown in the photo?
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-19-2009 12:41 PM  11 years ago
copperclad

rrElite Veteran

NY

MyPosts All Forum Topic
Hi Peter
i am pretty sure this is where i bought it
http://www.buyheatshrink.com/heatsh...g/test03.html#B

the stuff was way thicker than i had expected , it looks like a section of innertube , but although it is a little on the heavy side , i am sure it protects the cells , i cut two 3" strips first and shrunk them over the ends of the pack , and then slid the whole Marryanne into a tube and shrunk it , and i was carefull to listen to your input on the plugs and position of your pack , so my plugs are out the side and the endcell was positioned at the right height , the canopy just clears

cheers
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
06-19-2009 01:08 PM  11 years ago
Fixit

rrElite Veteran

UK

MyPosts All Forum Topic
Thank's for the link Dana, I like the look of that stuff better than the plastic.I only like to fly gassed up
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-19-2009 01:14 PM  11 years ago
Fixit

rrElite Veteran

UK

MyPosts All Forum Topic
Thanks FixIt. I will send them a message to see if I can get a couple of packs. How long did it take you to get the packs? I noticed their auction stated 4-10 days. Also did you use the same configuration as shown in the photo?
The service and communications were first class and they came to the UK in four days but British customs held them for another 4 days

I sent them the amendments to make the pack a perfect fit for the 500 and they said they would make the changes see the pictures below

I only like to fly gassed up
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 2520 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › How to build a 7S1P A123 battery pack???
Print TOPIC

 3  Topic Subscribe

Saturday, January 23 - 4:44 pm - Copyright © 2000-2021 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online