Slabism

hahahaha, thats a classic, the first thing they would do is heat up and start leaking

Painy

iTrader: (2)

New charging updates for GP 3300’s

SMC is really growing at a rapid pace and we will continue to keep the best quality possible. We will not sacrifice quality even though we are producing higher amounts of cells.I have been testing many methods of setting up my matchers in the past 6 months or so. Here is the latest care info that we have been using on the newer high voltage GP's.1: After a run discharge the pack down to 3.6 (4 cell) and 5.4 (6 cell) let it rest until the next time you plan on using it.

Before you go to charge it put the pack on a pure resistor (no diodes) use a tray such as the Integy Indi Octane 2, for 2-3 minutes and then charge it.

This will improve the runtime by a few seconds and keep the voltage and AIR in good shape.

2: For those who aren't concerned about capacity you can use the following method

After a run discharge the pack down to 3.6 (4 cell) and 5.4 (6 cell) and then place it on the resistor only tray for 5 minutes or so then short the pack and store it shorted until the next time you plan on using it.

If you run your pack a second time in one day you should put it on the resistor only tray for 45 - 60 minutes and then let it rest until you are ready to use it again

This method will drop the runtime by 20-25 seconds but will increase the average voltage and may reduce the AIR.

Painy

iTrader: (2)

he is serious about the dead shorting... leave the pack dead shorted untill you use it again,, 1 or 2 weeks later

Slabism

i stand corrected.

still find it a little hard to believe

fatdoggy

To dead short a pack I think you have to stick the pack on an equalizer and wait till all the lights go out, then solder positive to neg terminals and store it that way. I think it stops the cells natural effect of gaining voltage when sitting, it lowers the Internal resistance and gains voltage, which results in less run time. Is this correct or would the cells go into reversal if you let the lights go out?

414m2

thanks painy,

So you dont put in 30% charge into the pack after a discharge to store it? i heard that you do because leaving them discharged damages them.??

I used a home made discharger and got my whole pack down to sub 1 V (on the volt meter) and after that it charged at 3900 but then discharged at 3000 still. (because of the cutoff i guess)




THis was scabbed off the trinity site:

3) How should I store my batteries between races?
Discharge the pack down to .9 volts per cell which is. 5.40 volts for a 6 cell. Then store
them until the next race. If you plan on not running them for a few weeks, add a little charge to them (1 minute on a charger). These cell deteriorate quickly when left at a
low voltage point. Always store with at least .9 volts per cell in a pack.


also this:

What's most damaging to my Trinity cells?
Leaving the cells without charge is the worst thing, but overcharging and
hard discharging are close.

"Heat is the enemy of Ni-MH cells" oops...damn

and this:

Since Ni-MH cells have no discharge memory, there is no need to discharge them completely. Ni-MH cells must be stored with at least a 40% charge in them. Storing packs in a fully discharged state will deteriorate the performance over time.


yeah as someone said and you can see that there are lots of different opinions.

still we can keep sharing info and learn about batteries...

Painy

iTrader: (2)

there are a million different way of stooring a cell.. just do what you want..


but in the case of your packs 414..you wont make it anybetter as the damadge has allready been done.


did you discharge each cell individually?? cause if you didnt..you prolly reverse polorised some cells and stuffed your pack even more.

contact

iTrader: (2)

414m2

Opps....more damage/....wont discharging individually unequalise da pack?....or can you discharge each cell with the cdc and will that act as an equaliser?

Painy

iTrader: (2)

Just discharge your pack to 5.4 volts and you will be safe. charge at 6 amps. discharge at 20.

come talk to me and i will talk to you about it more.

414m2

okies....i will do

How come to charge them at 6 amps now??...what happened to 5?

i have a Big problem....my parts wont arrive till next week....

that means i can't race...
My friend said i can use his car....i might...but he has only 1 battery which is newer and less used than mine....so i dont want the same thing to happed to his battery....and he has a TC3 so my saddles dont fit properly so i cant use them.

i Will probably still come and watch for a while...and talk to people....

damn.,....i really wanted to go this fri....i want to race on the TcS track!....fun fun fun....but i will have none.......ehehe hey that rhymes.

cya friday

Painy

iTrader: (2)

sorry.. yeah 5

firetooth

There is a good article on duracells site all about Ni-MH batteries and charge/discharge properties.

http://www.duracell.com/oem/Pdf/others/TECHBULL.pdf

414m2

Thanks firetooth. Ill finish reading it later.

I cycled my battery and here are the results:
Gp 3300 Integy matched.

(discharged @ 20 amp and charged @ 5 amp)

charge from discharged to CDC cutoff:
capacity: 3110 mah, peak: 9.026 volt, IR: 38

Dischage after the charge above. (once cooled)
capacity: 2921 mah, Average volt: 6.874, IR: 34

Yeah....IS THIS any good??? compare to your batteries...then to how i have been treating them>...

414m2

I broke my car last friday while catching 1st place stock in the final just after hitting a dome and losing 1st position to a great driver Josh Pain.
Close racing -> i like it

Very bad....
see...




this is a pic of my gp 33's discharging on my CDC to get the results of my previous post.



This is my home workbench after a crash breaking the front chub and surrounding pieces:



I finally got the URLs to work