$40 US _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Aug 29, 2006 1:02 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
So $52.50 plus shipping...
If your buying a lipodaptor, let me know, I'll order one with you. I'll get back to you on the Cells... _________________ https://www.halfdonethings.com/
Tue Aug 29, 2006 1:15 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
I asked sid about keeping the M1 cells balanced.
Yes and no. It looks like these cells keep balanced pretty well (so do LiPos) but it's a good idea to check them occasionally. I've built a 6S pack without balancing taps but will probably put them on my next pack. I prefer the 0.1" connectors. If I can get around to finishing it, the MM7 http://www.slkelectronics.com/MM7/index.htm will keep track of discharge and the CLAMP (don't ask yet) will balance cells during and after charge. The important thing is that things have to get a lot worse with M1 than with LiPo before any damage is done. You will be fine with your charger & LPD+ as long as you don't abuse the cells and occasionally check them with a voltmeter.
Sid _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Wed Aug 30, 2006 7:46 am
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
quote:
as long as you don't abuse the cells
Why don't I like that quote
Nothing like a good ole direct short to kickstart your bot! _________________ https://www.halfdonethings.com/
Wed Aug 30, 2006 8:48 am
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
HOLD ON A MINUTE!
I was just having a read back through this A123 thread.....Phil posted this....
Some info posted on the RFL:
3532.6 in reply to 3532.4
The A123 cells require a very different charging voltage from regular LiPoly cells. LiPoly chargers charge at 4.2 V per cell, but the A123 cells require 3.6 V per cell. Connecting a regular LiPoly charger to a pack of A123 cells would destroy the pack from overvoltage. A 7S A123 pack will successfully charge using the settings for a 6S LiPoly pack, however.
CORRECT ME IF I AM WRONG
I would like to run 7 Cell A123 packs....I CAN charge this with my Triton set @ 6S LiPoly pack!!!! 25.2VOLTS!! _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Would the Lipo charge detection work though? You might find the voltage is OK, but if the charge can't detect the peak charge it will just keep pumping them until they are damaged. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Wed Aug 30, 2006 10:33 pm
Spockie-Tech Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
I think Lipo's use a CCCV (Constant Current, then Constant Voltage) charging model.
They charge at a set maximum current until the voltage climbs to a maximum charge voltage, then just hold the voltage there until the current draw at that voltage falls off to near-zero.
If thats the case, and the maximum voltage is correct, then A123's "should" work fine with an existing Lipo charger if the terminal voltage is correct.
Double check it though.. I havent actually tried it.. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
Thu Aug 31, 2006 12:19 am
Bort Experienced Roboteer
Joined: 15 Jun 2004
Posts: 696
Location: Sydney, NSW
Well I picked up the 160x CP2400s from master instruments last week. Haven't had a chance to post since then. I did get a moment to send Neweyns batts which have safely arrived.
Firstly thanks to Brett for taking the time to make the order for us. Much appreciated. Even if I did feel like a nerd when they said Robowars company eh?
Secondly Glen, here's a pic of the collection of batts. Yours is the brick. Now the real question is how much can I ransom your batteries for?
Seriously, Im off work on Thursday and can drop them off if your home.
Once again kudos to Brett
Mon Sep 18, 2006 8:54 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Many thanks to brett once more. i guess im in dept once more
sweet. thursday sounds good to me im at work thursday but ill be home ~6 ish.
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