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Trex 550E;

Flightmax 6S 22.2V 5000mah 40C here.
dead on balance with battery at very top end of tray

Blade 4503D;

3S 11.1V 2200mah 30C.

Sky Fly Max STANDARD ENGINE;

Standard motor draws 15amps and a 25amp speed controller.

3S 1500-2200MAH 15C TO 25C max discharge.

Sky Fly Max SuperTigre.10

Motor draws 29amps and a 30amp speed controller.

3S 2200MAH 30C max discharge.

 

(Cessna, 4503D, and large engine SkyFly Max should take a “30C” 2200mah.

Traxxas RC boat;

11.1V 3S 5000-8400MAH 25C MAX

OR… 22.2V 6S 5000MAH 25C MAX DISCHARGE.

 

 

A good Battery tip i found;

running in a series or parallel only has to do with wiring. any matching batteries can be run either way….but you want to be sure to match the batteries and their wiring correctly to your system.

The mmm should be used with 4s-6s setups. running two 3s batteries parallel is like running one big 3s battery….not enough voltage for your system. running those batteries in a series is the way to go.

here is some more general lipo info for you;

When it comes to the ERBE (E-Revo Brushless Edition) the BEST battery solution is LIPO batteries. They are better than all others with the exception of maybe A123 cells (but those dont fit…at least not in the voltage and capacity we would want, so your better off using lipo)

Is LIPO dangerous? Sure…anything can be dangerous ….if you dont know what you are doing. But if you learn about their limitations and hazards (more importantly how to avoid them) they are safe and you will be just fine.

What do I need to know? Well, like any battery, lipos prefer to be stored at normal temperatures. Whats normal? Well, to keep it easy, don’t store them anywhere you wouldnt be comfortable storing yourself. Your lipos, like you, don’t like being too hot or too cold. Would you enjoy sitting in your car if it was 100F outside?…..neither would your lipos. They dont enjoy being stabbed or punctured…so if you wreck and your lipos get punctured, they are done…any voltage going in or out of them at this point can be volatile and possibly cause a flame-out, so stand back. Other then that the only thing you need to remember is to keep them at their optimal voltage.

Voltage:
Lipos are designed to function best between 3 and 4.2 volts per cell. At 4.2 volts the cells are at their max, at 3 volts they are at their minimum. Discharging Lipos lower than 3 volts per cell will begin to shorten their lifespan, damage them, and if your not careful, ruin them. It is for this reason that your Electronic Speed Control (ESC) has a Low Voltage Cutoff (see post #72).

When lipos have a draw on them (or they are being used) the voltage drops to about 3.7 volts. It will remain at about that voltage throughout most of the run until it quickly drops off towards the end of its charge. It is important to know this, because many companies use this number when selling their batteries.

The ERBE is capable if handling upto 25 volts. To get to this voltage, lipo cells are wired in a series. When you wire cells in a series, you are stacking the voltage. Lipos come pre wired in packs, and in turn, you can connect whole packs even further into a series harness and stack their voltrage as well. This comes in handy for vehicles like the e-revo that use two compartments to hold the batteries. So lets break it down. If you buy battery packs that are advertised as 7.4 Volts, then you now know you are dealing with a pack that has two lipo cells wired internally in a series. They derived this number by taking the working or nominal voltage (the voltage of a cell during use) of each cell (3.7 volts) and Stacking it (series) to make 7.4 volts (3.7 X 2). If you then put one of these packs in each compartment of the ERBE, you can connect them in a series to stack your voltage further to 14.8 volts. You now have two packs in your truck, one on each side. Each pack having 2 cells, you now have a total of 4 lipo cells, each with 3.7 volts stacked for a total of 14.8 volts. This is commonly refered to a 4s set-up. ….Thats great, but how do we get to 25 volts? Well, you have the option to buy packs that have 3 cells wired in a series. These packs are adverised as having 11.1 volts (3.7 X 3). They are known as 3s packs because they consist of having 3 lipo cells stacked in a series. If you buy two of these packs, put one on each side of your truck and connect them in a series you will now have a total of 6 cells stacked for 22.2 volts. This is commonly refered to as a 6s system. …..Again where do we get 25 volts? Well, you get 25 volts from batteries that are resting. Remember, lipo cells fully charged hold 4.2 volts per cell. 4.2 X 6 = 25.2 volts. Technically, you only have 25 volts when your truck isnt moving.
Great, so we see 4s and 6s set-ups, but how do we get 5s? Well, simple really, you connect a 2s pack and a 3s pack in a series for 5s.

Capacity:
Ok, so you now know how to get 4s, 5s, and 6s, but what about mAh?
mAh is the capacity of a lipo cell (measured in milli-amp hours, or Mah). In general, the greater the mAh, the longer your runtime will be. Lipo cells in general are available upto about 5000mah in capacity. Beyond this, pairs of cells are used in parallel to increase the Mah, and therefore the runtime. Parallel? Yup…. get comfortable….. We have been talking about how cells get stacked in a series to double their voltage….well, when they are wired parallel they double their capacity (mAh). Why do I need to know this? Well, because it gives you more options. Finding the right batteries for you application can sometimes require you to get creative. The more you know, the more creative you can get. You know that Connecting 2 2s packs in a series will give you 4s, but If you find some packs that are built 4s already, you can wire two of them Parallel to get longer runtime out of them.

What about the C rating?
The C rating is also known as the discharge rating. This is a measure of how much current ( in amps) the battery can output before it will overheat and become damaged. Most lipos have the C rating listed in their specs, but this doesn’t actually tell you how many amps the lipo can ouput, there is a very simple sum however:

Mah capacity x C rating / 1000 = output potential.

For example, a 10C 5000mah pack can output 50amps, and a 20C 4000mah pack can produce 80amps. This however is assuming that the C rating on the pack is accurate.

be nice.