Cafefroid

Hi guys,

This might sound as a newbie question, but I'll ask anyways since I haven't found an answer anywhere in the forums.

I race a spec TT-01 class with 540 motors and 3000 mAh 7.2 volts batteries or less. 95% of the guys runs venom 3000 stick packs and some run wolfpack 2400 ( I have both in my box).

I just bought a Pulsar 2 charger, so I can now check voltage when I discharge my batteries and try to optmize their performance. I charge with various parameters, and then discharge them at 10 amps and watch for voltage at 5, 60, 120, 180, 240 and 300 seconds to get an average of the performance.

So far, the only parameter that seems to make a difference (gain at least 1%) is the delta peak, which seem to give best results at 30 for the 2400 packs and 20 for the 3000 ones. I played with charge amps, from 3 up to 5.5 and the results don't really change, just as letting them cool down for 10 minutes and the peaking them before discharge.

Any tips on getting the most voltage for a 5 minutes run out of these things? Do I need to repeat the cycle a couple of times at 5 amps before it makes a difference?

Thanks a bunch guys!

ta_man

iTrader: (168)

The way to get the best out of venom 3000 stock packs is to use them for paperweights and buy some good packs.

Venom batteries are rated for capacity at a 1C discharge. That means 3 amps for a 3000 pack. Every Venom pack I have tested (like about half a dozen - after which I gave up) was down on voltage and capacity when tested at a resonable discharge rate. For example, on three different Venom 3000s discharged at 17 amps (my estaimated race discharge rate with a stock motor) here are numbers:

Av Voltage: 6.40V mAHr: 2072
Av Voltage: 6.40V mAHr: 2171
Av Voltage: 6.43V mAHr: 2087

Compared to two Orion 3000s:

Av Voltage: 6.81V mAHr: 2814
Av Voltage: 6.84V mAHr: 2757

Or if you don't need paperweights, you can take the packs to Radio Shack to be recycled.

If you have a charger that shows you pack statistics, you will find the Venom packs don't even take a charge equal to their nominal rated capacity. Maybe on the first charge from empty, but not after that. So if you can't fit 3000 mAHr in the "3000" pack, how are you going to get it out?

Starteur

iTrader: (1)

Je charge a 4 amperes et je la re-peak a 6 amperes sur mon autre chargeur,
et contrairement a ce que l'autre monsieur t'a dit je n'ai aucun probleme a charger 2900 a 3000mah dans mes batteries.
Ce qui est important c'est le peak voltage, plus il est haut pire est l'état de ta batterie, il doit etre au max entre 9.30 et 9.50 apres cela ta batterie s'en retourne tranquillement vers la poubelle.
Autre chose tu dois etre capable de re-cycler les batteries, si ton chargeur ne le fais pas demande a Jocelyn de verifier tes batteries c'est un pro la-dedans.


Salutations

Starteur

Logika

Ja jau visi saak seit rakstiit savaas valodaas tad jau es arii varu.

Anyway I think you should try to push your car not in batteries, but just lose same weight, solder shorter wires allthrough. I think batteries are just pushed to the limit.

a_main_attendee

iTrader: (2)

edit, didn't notice the "3000 mah and less"...

That's odd. I'd try to find some panasonic 3000.