×SlappY×

ok um.currently i have a 1500mah duratrax pirannah battery, it takesa bout 20 mins to charge,for my birthday,im gunna ask my parents to get me a 3300 mah battery, since the 1500 takes 20 mins to charge would the 3300 take like 40 to charge since it has more then twice the milli amps then the other? and. wuts the best brand of 3300mahs?? id also like to get a discharger for my birthday.. wut i do to "kill" the batteries rite now is just flip my car over. and let it run at like half throttle till it dies out..

×SlappY×

pliz help me out

×SlappY×

i was searchin on www.greathobbies.com. for a discharger, i found this one, its 13.99$ canadian. im in canada so low shipping costs.

VBD Battery Discharger
Battery Maintenance Made Easy!
The VBD is a resistor style discharger and comes pre-wired with a TamiyaĀ® style plug factory installed. Using a variable discharger rate from 250mAh to 750mAh. In addition, the VBD features an LED status indicator and automatic cut off at 4.9 volts. The VBD is not intended to discharge a fully charged pack.

Cory Ream

the best 3300's right now are made from GP
you can get some nice stickpacks or matched packs from:
www.kmrbatteries.com
or get them from my sponsor:
www.teamscreamcellmatching.com

×SlappY×

wut about that discharger? is it any good?

iliketobreakthings

whats the point of a discharger[&:] i just charge them and run them over and over

×SlappY×

i know but.. i read on another thread. and they recommend a discharger cuz they say killing the battery my way, " letting the car run upside down till wheels stop turnin" isnt healthy for the batteries.. is it true?[&:]

B.T.D.T.

Believe it or not. I was in to electric RC cars over 13 years ago. I just recently started to get back into the hobby. I was able to get life back into my batteries. Actually only half of my batteries packs made it (5). I have the sanyo 1700mah SCE (NI-CD). I just run the batteries down just before my ESC will sent my car off running. And sometimes it just runs away and I have to chase it. I run with BEC. I charge them the night before I plan to play. That's how I did if back then and the batteries still works. I do plan to by the 3000mah batteries and a new charger for the NI-MH.

I had to cycle my batteries to bring them back to life. Now, I used a discharger to discharge the batteries. You have to monitor the voltage it draws down to. It get very HOT so be careful (discharger & battery). Also if you have computer fans 12VDC, hook them up to discharge and to cool off your batteries at the same time. It's very slow, a set of car bulb can discharge your batteries also, DON"T let it run down until dead. I don't remeber what was the voltage to run them down to. I guess/hope the newer discharger shuts down automaticlly when the battery get low.

I use a 120VAC computer fan to cool off my power supply, battery charger & batteries. HEAT is killer for batteries. NEVER recharge your battery pack after a hard run. It will be HOT. Only charge the batteries when they have cooled down.

Now with the newer batteries NI-MH I'm not 100% sure what will or will not work. I plan to do the same as I did back then. Hope this helps.

iliketobreakthings

my batteries charge to about 8.94 volts then when i finish running them (when my car goes 5 mph) they are about 7.20 volts ... then i just let them cool and charge them up... i have never used a discharger or anything to do with the batteries besided installing deans

Farwar

You could make your own discharger for less than $20. Use some lightbulbs and solder them up. Here's a link: http://www.balakracing.com/bulbdischarger.htm

RC Havoc

My Feedback: (-1)

For storage, i hear its better to leave 3300's charged a little bit. It does not hurt them to leave them charged like NiCad's. Ive heard you can even kill it half way and recharge it without a memory issue. A single cell discharger is still recomended to make sure each cell carries the same amount of charge...

Cory Ream

hey RC Havoc do you race in AZ?

Maxx-Crusher

discharging batteries is unique to nicads because of there inherent memory effect. NIMH batteries do not have a memory effect and do not require discharging. Also fastcharging batteries are not healthy for them. The rule of thumb i use is to not charge them at a rate that exceeds there rating. So i would charge a battery rated at 3300mah at no more than 3300 mah or 3,3 amps. This would charge a totally dead battery in about an hour.

iliketobreakthings

my 3000 mah batteries can only be charged at 3 amps.... and it takes baout 45 mintues

×SlappY×

hmm so the more mahs the longer the charge is?
so lets say
average charge time fer a 3300 mah batt is 40 mins average?

iliketobreakthings

it all depends on the charger and the brand of battery... so its kinda hard to estimate

×SlappY×

well... im getting a Hobbico 900. it takes 20 mins fast charge fer a 1500.. and ill most prolly get a gp 3300

iliketobreakthings

isnt it bad to quick charge your nicds.... or maybe im thinking of the wrong thing[&:]

Maxx-Crusher

yes it is bad to quick charge all batteries.

iliketobreakthings

ya thats what i thought.... i wait 45 minutes for my 3000 mah nihms to charge but its worth it with 17 racing min run times

×SlappY×

ey wuts the diff from a nicd .nihm . nicad?

iliketobreakthings

nimh = nickel metal hydrate (i think) have no memory require absolutley no maintence

nicd = Nickel cadium... require maintence and must be discharged

nicad = its really a nicd battery but some people call then nicads

×SlappY×

so, my duratrax 1500mah piranaah is i nihm i believe. so i doesnt matter if i just let it die out ? like spinning my car wheels till they stop? if i get a gp 3300 wut kind is that?

iliketobreakthings

im not sure if you batterys are nimhs but its not a good idea to run them till the wheels stop... when my car only goes about 10 mph i just take them out, let them cool, and just charge them again

×SlappY×

wut type are the 3300's in general? wut brand of 3300 should i buy?