battery connector type

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
slawhammer said:
I like to use this web site www.batteriesamerica.com
Now if you go bigger in voltage and mah you will need to get a voltage regulator
To bring every thing to 6 volts....These people also have the 6 volt regulator's
there like $20 bucks.......
I use a stick battery 8.4 volts 4600Mah....with a 6volt regulator
I can run my firehammer for 5 tanks of fuel on the battery charged in the car...
your TX batteries will die before the car will.....
Just my thoughts here......Slawhammer............
Click to expand...

Hey Slaw, just a question...
Why run a 7 cell pack and then drop it down to 6 volts? Couldn't you just remove 2 cells? I am only asking because when I used to run electrics, the 7 cell packs always dumped faster than the 6 cell packs... I was told along time ago, "The higher the voltage, the quicker the discharge" ..Or has battery technology changed that much in 15 years :lol: I run a Sanyo 1900SCR 5 cell, that I charge about 3 times a year whether it needs it or not!! lol ...I don't know, it just seems to last forever!

Trip..
 
Trip...Ya want more mill amps to hold a charge longer...to get that you have to have more cells..means higher voltage....now most Radio control recievers will not take over 4.8 volts
somr will take higher volts....so that is why you use a voltage regulator to bring the voltage back down to be safe....so you will not burn up any electronic's....
............................Slawhammer........................
 
slawhammer said:
Trip...Ya want more mill amps to hold a charge longer...to get that you have to have more cells..means higher voltage....now most Radio control recievers will not take over 4.8 volts
somr will take higher volts....so that is why you use a voltage regulator to bring the voltage back down to be safe....so you will not burn up any electronic's....
............................Slawhammer........................
Click to expand...

I have one of these. I may have to put one of my lipo packs in and use it.
 
Sorry, I worded that kinda dumb again.:blush:
When I run my CX2 on lipos it flies all over for about 10 minutes then just drops and looses all charge. Lipos give 100% until the end, and there is a short window of "I better stop and charge it".:laugh:
 
Bigger the Better said:
Sorry, I worded that kinda dumb again.:blush:
When I run my CX2 on lipos it flies all over for about 10 minutes then just drops and looses all charge. Lipos give 100% until the end, and there is a short window of "I better stop and charge it".:laugh:
Click to expand...

Oh yeah, you're 100% right about that. I planned on running a pretty high mah pack. Something like a 7.4v 5000mah or so. Something like that should last through several tanks.
 
slawhammer said:
...Ya want more mill amps to hold a charge longer...to get that you have to have more cells..means higher voltage...
Click to expand...

Since these are series packs the capacity of the pack is simply the capacity of a single cell. A 4200mah series battery pack will put out up to a total of 4.2 amps current regardless of whether there is 1 cell or 10 cells in the pack. Using a battery pack with a voltage higher than is needed and using a regulator to drop the voltage down results in energy just being wasted in the regulator. It's usually best to match the supply voltage to the load as closely as possible and eliminate any dc-dc conversion.
 
Spackle said:
Since these are series packs the capacity of the pack is simply the capacity of a single cell. A 4200mah series battery pack will put out up to a total of 4.2 amps current regardless of whether there is 1 cell or 10 cells in the pack. Using a battery pack with a voltage higher than is needed and using a regulator to drop the voltage down results in energy just being wasted in the regulator. It's usually best to match the supply voltage to the load as closely as possible and eliminate any dc-dc conversion.
Click to expand...

Those new high capacity cells aren't limited to 1c disharge. A 4200mah pack is capable of putting out 60+ amps.
 
Last edited:
Spackle said:
Since these are series packs the capacity of the pack is simply the capacity of a single cell. A 4200mah series battery pack will put out up to a total of 4.2 amps current regardless of whether there is 1 cell or 10 cells in the pack. Using a battery pack with a voltage higher than is needed and using a regulator to drop the voltage down results in energy just being wasted in the regulator. It's usually best to match the supply voltage to the load as closely as possible and eliminate any dc-dc conversion.
Click to expand...

Exactly, you just beat me to it.

Trip..
 
Small2Large said:
Those new high capacity cells aren't limited to 1c disharge. A 4200mah pack is capable of putting out 60+ amps.
Click to expand...

Yes, I apologize for being sloppy in my wording. I should have said the pack will put out 4.2amp-hours of capacity regardless of cell count. The only difference is that with more cells it will put out more energy, i.e. it will deliver that capacity at a higher voltage. Of course, as you mention the pack could put out 60amps for about 4 minutes.

If you have a load that requires 6v, then using a battery pack larger than 6v results in inefficiencies due to the dc-dc conversion. It would be better, for example, to use two 6v/4.2AH packs in parallel than to use one 12V/4.2AH pack. Even though each battery configuration has the same total energy, the single high voltage pack has to have its voltage reduced to 6v and that conversion can typically steal 20% of the total energy. It all depends on the efficiency of the converter. Plus, you have to pay more for the higher voltage packs as well as pay for a dc-dc converter (BEC).
 
Small2Large said:
lol, you never had an electric RC?
Click to expand...

Ya, I ruined a many 1500 packs if they were that back then.:blush:
Then again back then I just bought the packs, plugged them in, ran until the buggy stopped, then charged them. This cycle went on, and on, and on, and on, until I got 30 minutes of total fun in.

Then I bought a NITRO!!!!:devil:
I tried starting, tried again, tried again, swapped out broken glow plug, tried again, tried again, started it, ran for 5 minutes, checked temp, shoot too hot, needle setting change, ran it for 5 minutes checked temp, dang too cool, needle adjustment again, ran out of fuel, filled, tried starting, tried starting, flooded, removed glow plug...... You get the point.

GASERS RULE!!!:lol:

Spackle said:
Yes, I apologize for being sloppy in my wording. I should have said the pack will put out 4.2amp-hours of capacity regardless of cell count. The only difference is that with more cells it will put out more energy, i.e. it will deliver that capacity at a higher voltage. Of course, as you mention the pack could put out 60amps for about 4 minutes.

If you have a load that requires 6v, then using a battery pack larger than 6v results in inefficiencies due to the dc-dc conversion. It would be better, for example, to use two 6v/4.2AH packs in parallel than to use one 12V/4.2AH pack. Even though each battery configuration has the same total energy, the single high voltage pack has to have its voltage reduced to 6v and that conversion can typically steal 20% of the total energy. It all depends on the efficiency of the converter. Plus, you have to pay more for the higher voltage packs as well as pay for a dc-dc converter (BEC).
Click to expand...

This kinda makes sense. If you put two 6v in a parallel I take it that would not make 12v? Ok, I don't get it. :blush:
 
Bigger the Better said:
GASERS RULE!!!:lol:
Click to expand...

Yeah, I like nitro and gas much better than electric, infinite run time! Except for those receiver batteries draining down :)

Bigger the Better said:
This kinda makes sense. If you put two 6v in a parallel I take it that would not make 12v? Ok, I don't get it. :blush
Click to expand...

Two 6v/4200mah batteries in parallel is equivalent to a 6v/8400mah battery. Put them in series and you have a 12v/4200mah battery. Same total energy but the 12v battery has to use a converter to get back down to 6v.
 
Bigger the Better said:
Ya, I ruined a many 1500 packs if they were that back then.:blush:
Then again back then I just bought the packs, plugged them in, ran until the buggy stopped, then charged them. This cycle went on, and on, and on, and on, until I got 30 minutes of total fun in.

Then I bought a NITRO!!!!:devil:
I tried starting, tried again, tried again, swapped out broken glow plug, tried again, tried again, started it, ran for 5 minutes, checked temp, shoot too hot, needle setting change, ran it for 5 minutes checked temp, dang too cool, needle adjustment again, ran out of fuel, filled, tried starting, tried starting, flooded, removed glow plug...... You get the point.

GASERS RULE!!!:lol:



This kinda makes sense. If you put two 6v in a parallel I take it that would not make 12v? Ok, I don't get it. :blush:
Click to expand...

Yeah gasers do rule for ease of use. Only problem I see is making sure they are tough.

As for batteries, it used to be simple. Parallel would double runtime, series would double speed (if the motor can handle the extra voltage)

But now with lipos, parallel can actually double speed as well since it doubles the amount of amps available.

This is all theoretically speaking.
 
Last edited:
I saw 2 11v lipos on ebay with a buy it now of 20 bucks!!! Then I read a little more and found out they were only rated at 15c! :lol: I guess you get what you pay for!

Trip..
 
Trip said:
I saw 2 11v lipos on ebay with a buy it now of 20 bucks!!! Then I read a little more and found out they were only rated at 15c! :lol: I guess you get what you pay for!

Trip..
Click to expand...

I bought a pair of cheap Chinese lipos for $40 shipped. They are 3s 2450mah, 25c continuous. I plan on wiring them in parallel for my traxxas rustler. Should be able to provide over 100amps and 4900mah. A single 3s 5000mah 25c pack is around $80+.
 
Back
Top