What battery for the XXX-S sedan???

[chauffeurexpres]

Hi
Last week i buy a xxx-s sedan from losi brushless and i want to now if is my battery i have for my hpi rtr evo 3 a 3600 nimh 7.2 volt will work with my xxx-s and for the charger i have dynamite prophet plus lcd. Thank for your help sorry for my english im french but im trying the best i can lollll

[timie1]

Don't apologise for your english. You speak english better than a lot of the people on here that have it as their first language:)

Yes your battery should work fine if it is in good condition and is a good battery to start with. In my brushless I run a bunch of batteries, but on a GP3300, it runs very nicely. It even runs nicely on a 1700 nicad, not as long run time, but it runs great for about 5-7 minutes. Is you battery in a stick configuration or side by side? That's the only thing you may have to be careful of. Not all cars fit side by side packs or stick packs.

I'm looking at the specs of that car on the losi website. They say it does 25mph with the stock setup SS4300 novak motor. You should be able to gear it more to get a lot more speed from it. 25mph seems pretty slow with a high torque brushless motor. I've had cars going about 33mph with a brushed 27t motor, so that brushless should be quicker.

Good luck

[chauffeurexpres]

thank for your help yes my battery is brand new abouit 2 week and is a stick of 6 battery the mark is AE team associated LRP hyper pack 3600 6 cell. Do you now a munch time my car we will run with this battery???? thank again

[chauffeurexpres]

the guy told me a the shop this car with a good battery can go to 65 mhp but a THE shop the price was high 380 +taxe can and on ebay brand new in the box 296 no taxe can im think it a good deal

[timie1]

The guy in the shop lied to you. There is no way the car, with the setup that is in it can do 65mph. MAYBE it's possible with some high power lipo and dramatically altering the gearing, but I doubt it. Not many cars can do 65mph, and certainly not an RTR. Maybe he meant 65 kph (39mph). That's a more reasonable speed.

It sounds like you shouldn't have any problem with the battery and the car. Go charge it, and race:D

[chauffeurexpres]

and with this battery my car can run how munch time ????

[GSMnow]

I have to agree on the speed. The stock Novak setup is probably good to 40 mph tops, and that would be on a large smooth surface. You want to be careful with gearing so you do not over heat the motor. You should select the gear so that it reaches top speed on the track you are driving on. A shorter straight should be geared slower. Brushless motors use much more current when they are not at maximum rpm. If you gear for too high of a speed, and it does not go that fast, your motor will run much hotter and your run time will be much shorter.

Geared properly, you should be able to get 8 to 12 minutes of run time on a good set of 3600 mah NiMh batteries. I race off road with a Mamba Max 5700 brushless, and I can get 14 minutes on IB4200 mah cells when I am geared for 32 mph on a tight track. The Novak SS4300 is a little less power.

[chauffeurexpres]

ok i start my car today with my new battery 6 cell 3600 nimh and i run the car in my hand (because outside i have a lot of snow)the car start very fast and 20 sec after the car become slow slow how munch time we need to charge my battery??????? i have the charger dynamite phophet plus lcd and it wrote FAST or TRICKLE what choice im very confused right now and i wont to play with my nwe car lollllllllll thank for your help guy

[GSMnow]

The dynamite phophet plus charger is adjustable and should be able to get a very good charge into your new battery pack. Be sure to set the charger for a 1C rate which means 3.6 amps (3600 ma) on your 3600 mAh pack. Higher current may charge a little faster and some say it gives more punch, but it certainly shortens the life of the battery. A 1C rate charge should take about 1 hour for a full charge. The charger you have will switch to a lower current trickle charge when it detects a full charge. Trickle charging is actually good to do as it will bring all the cells to full charger without over charging the lower capacity cells. Before race day, I like to top up all my packs on a peak charge and then let each one trickle charge for an hour or so to make sure all six cells are fully charged up. At the low trickle current, a full cell will start to draw current internally and maintain a safe level without cooking the cell. In a series string, this will allow the higher capacity cells to continue charging until all 6 are full and drawing the curent internally. At a high charge current, the internal current becomes far to high and causes heat and possibly cell venting. This greatly hurts cell capacity, making the lowest capacity cell get weaker even faster. It is much better to have it go off of fast peak charge and finish it off with the trickle.

[timie1]

That's a good point GSM. I like trickle charging my packs every now and then to help keep the cells reasonably balanced. But adding some trickle charge into it after it has peaked with 1c rate sounds like it would help to balance them all the time. At what rate do you trickle charge your cells? On my charger, I can select 100, 200, or 300mah AFTER the normal peak charge. I like using 300 when I fully charge them using the trickle method because it is as close to .1c that I can get with my 3300nimh without going over.

[GSMnow]

I have my TC1030 set to trickle at 200 ma on my 4200's. It is enough to keep the open voltage up at 8.5 until I run. It is low enough that the battery cools to ambient temp in just a few minutes after the peak. C/10 is probably a good safe rate for most cells, so 400 ma might be better, but I have had a few of my older IB4200 packs vent on me right before they peak out, so I am being gentle on them now. I even dialed the peak detect down to just 1 mv/cell.

I also made up a pair of cables with some resistors on them that I run from my 13 volt power supply to the battery in the car when I am waiting for my heat. It supplies about 150 ma to keep the voltage up. I pull that off right as I go to the start line. My only issue now is my packs are not giving full punch when I get to the track. I have to run it hard for about 3 full laps before I get full acceleration out of it. Noone has been able to answer why this is happening, but it is very real. We have a HUGE triple jump section and I CAN'T make even a double of the first two for 2 laps, then it slams into the third hill on lap three, and then clears the full triple on lap 4. Go figure. I get 10 to 15 great laps after that, then it starts to taper a little and gets very soggy at 12 to 14 minutes of racing. I do have the low voltage cutoff set at 5.0 volts and it is certainly triggering and limiting the torque due to low voltage, so I could get a harder hit if I disable that, but I think it is just being nice to my aging batteries to NOT pull them below 5.0 volts under acceleration when they are fresh off of the charger. It does this no matter how I cherge them. I tried everything from a slow overnight trickle from dead to full charge all the way to 8 amps for 30 minutes until it peaks, and going right to the track with a warm battery, but even then, it too 2 laps to get it's guts. The trickle before the race seems to have helped a bit. The run with it HOT off the charger was a tick stronger sooner, but the run time was less than 10 minutes.

Anyone have an idea about this one?
I know the cells are going off, but I have never seen this behaviour until I got 4200 mah cells, and now even my best EP4200 is doing it a little, just not the extent of the two older IB4200's.