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Polymer Lithium Ion Battery - 2200mAh 7.4v (Sale)
Replacement:PRT-11856. Our new part now comes equipped with a Dean's Connector instead of the 8AWG bare discharge leads, go check it out! This page is for reference only.
This high discharge LiPo is a great way to power any R/C, robotic, or portable project. This is an excellent choice for anything that requires a small battery with a lot of punch. The voltage is low enough not to tax your regulating circuits, and the discharge rate is high enough to accommodate a lot of electronics and a few small motors.
The battery has two cells and outputs 7.4V storing 2200mAh of charge. Because this is a dual cell battery pack, a special charger is needed. This battery is not compatible with single cell chargers. A compatible charger is listed below.
Note: Care should be taken not to short circuit or overtax these batteries because they don't have any built-in protection circuit.
**Weight: **206g (7.26oz)
- 7.4V 2-cell pack
- 2200mAh of charge
- 30C continuous discharge rate
- JST-XH charge plug
- 8AWG bare discharge leads
- 138.5mm x 47.5mm x 24.5mm
- [MSDS](http://cdn.sparkfun.com/datasheets/Prototyping/Lithium Ion Battery MSDS.pdf)
Polymer Lithium Ion Battery - 2200mAh 7.4v (Sale) Product Help and Resources
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According to the picture, it's 37.5mm wide, not 47.5mm. The length seems off too, but with the wires and such, who's to say.
Is there a data sheet for these? What is the minimum acceptable discharge voltage, and what is the target discharge voltage for best lifetime? How many cycles can I expect at 2C? 10C? 30C?
Hey I bought some of these batterys and a Li-Ion/Polymer Battery Charger/Balancer - 50W, 5A and I have some doubts, What are the right voltaje and current to charge this battery ??? When do I need to balance it ?? If I´am not using them, how do I store them ??? Thank you have a nice day ;)
Can this be used as two separate battery 2200mAh 3.7V batteries by using the red/black/yellow wires (I'm assuming black is common ground)?
Is there a special (adapter) charger for this thing?
I don't mean the multi charger that's not very usable for me.
That's the only one we have. You need a charger that can charge multiple cell lipos.
How many cells are there
I know it's been a while since you asked, but in general, one cell (in series) equals 3.7V. So, this would be effectively two cells (2x3.7=7.4). Of course, to equal the capacity, it's possible that multiple cells would be hooked up in series. However, for the purpose of charging, this would still be considered a 2-cell battery (still requiring a multi-cell charger).
However, looking at the "Features" for this product, the first bullet item states "7.4V 2-cell pack," so I'm going to say it's probably 2 cells.
What are the continuous & burst discharge rate of this & can I use Li-Ion/Polymer Battery Charger/Balancer - 50W, 5A sku: PRT-10473 charger with this
I'm looking for a different charger to charge these batteries. I'm looking for a simple, plug it in and leave it kind of charger. I'm developing a device who's users won't have the "know how" to use the charger listed below.
Any suggestions?
we use FMA chargers here (quadrocopters -- http://www.FlyingMachineArena.org)... seem to work pretty well. They auto-start, check for the usual error conditions, and in general seem pretty easy to use. (I'm not associated with FMA Direct Inc in any way)
Without searching through all the other batteries, there are various reasons why the energy density varies. The batteries here can sustain a 30C discharge. Typical Lithium batteries are rated at far lower discharge rates, on the order of 1/2C to 2C. There is a compromise in order to do that safely, and energy density usually takes a hit.
so with this battery, a 30c continuous discharge rate is something crazy, like over 50 amps for 2 minutes?
with a high rating like this, would this make a decent RC car NiCad battery replacement?
Yes it would. Hmm, two in series might be able to jump-start a car.
It's a cool idea, but a warning to those considering it...
PLEASE DO NOT DO THIS.
Jump starter packs usuall used a lead acid battery because it is cheaper, and they can take a beating. LiPo batteries cannot take that beating as well.
Also you're looking at more like 16.0V on a full charge. Some newer car computers may not like it for various reasons.
And more, if discharged too much, you have the common undervoltage problems of LiPos (swelling or boom) as well as the fact that the car system may actually decide to start charging the LiPos (cars seems to run around 14.2-14.8; this is above the needs-charging voltage of two packs in series.)
Though, someone correct me if I am wrong.
Point well taken. I mostly speaking tonguke in cheek, and thinking back to Polaroid's PolaPulse batteries. They were 6 volt flat battery packs designed to be built into film packages. Having a large surface area, they could put out a lot of current, and stories circulated that two in series could start a car.
For these batteries, they should be pretty rugged, but you're right, don't try this unless it's the only way to start your truck while you're fleeing the zombie hordes.
It would be handy to use something like this as a backup power supply. You should consider a breakout trickle charger for charging these.
LiPo batteries aren't great for trickle charging - something like this would be much better.
However, a couple chargers on here will maintain a LiPo battery already. They charge to max, then wait until they've self-discharged down to a certain point before recharging again. Check the comments and datasheets for the various LiPo chargers on here.
the 1000mAh Lithium pack you sell weighs a fraction of this big boy. is there a good reason for this that i don't understand?
in other words, you could put three of those babies in parallel and get 3000mAh, and still come in 35g under the weight of this one. or go with 4 packing 4000mAh, and weigh only another 13g.
that's a lot of juice!
2200mAh * 30C = 66 amps. They are heavier because their max discharge is so much higher, while their charge capacity is similar to stacking 2, 1000mAh batts together.
Correct me if I'm wrong, but this pack could deliver a max current of 66 amps for 2 minutes?
So yes, mAh's to mAh's, these don't look as good, but the max discharge rates is where these packs really come through and provide a lot of power.
Note the Feature description is wrong. The wires are 12 AWG, so you won't get 66 amps through them.
The wire thickness doesn't limit you to 66 Amps. 12 AWG wire has a resistance of about 0.00162 Ohms per foot. 7.4V / 0.00162 Ohms (assuming 2*6 inches of 12 AWG) means the limitation, based on the wiring alone, is about 4568 Amps.
Please correct me if I'm wrong, but 4568A at 7.4V is 33kW?
See http://wiki.xtronics.com/index.php/Wire-Gauge_Ampacity
perhaps a better way to compare between packs is by cost. while other packs boast better numbers, they also come with a heftier price tag.
this pack, then, seems pretty good, all other things considered.
I was just about to comment on the mass.
Comparing energy densities for the other LiPos here, this pack seems pathetic.
* "Old" LiPo w/ 2000mAh @ 3.7V: (2.0Ah * 3.7V)/.036kg = ~205 Wh/kg
* New" LiPo w/ 1000mAh @ 7.4V: (1.0Ah * 7.4V)/.048kg = ~154 Wh/kg
* New" LiPo w/ 2000mAh @ 7.4V: (2.0Ah * 7.4V)/.179kg = ~83 Wh/kg
Anyone know the reason for the huge difference? I was totally excited to use these, then saw the weight.
EDIT: SFE, could you please check the actual mass of these? I've been looking around, and the same brand has very confusing masses listed on other sites (for example, not much difference in mass between same voltage, about 200-400mAh difference batteries. Also, a pack that had less capacity had a higher mass listed)
weights have been fixed.
they are correct now and should be more appropriate.
Those masses seem even worse! Haha, well, I suppose they are rather cheap batteries. The 1000mAh one nearly doubled its mass from spec to measurement though, ouch.
I agree, this one is pretty poor. The best Ah/kg density I've found so far are still the ThunderPower ProLite batteries (I'm not associated with them in any way).
If anyone knows of lighter batteries (less than 150g for 2.1Ah3s), please, please say so :-)
The only problem with the TP's is that a lot of them puff up quite a bit... but the capacity lost isn't that great and we haven't had any explosions :-) yet.