Flat Pack "toy battery" Li Ion packs

[WarHawk-AVG]

502030 Replacement 3.7V 240mAh 30C Batteries for R/C Aircraft - White (5 PCS) - Free Shipping - DealExtreme

Anyone ever consider say getting some of these since they are 1.22" square and put em in parallel inside a box mod to make a mod?
Dimensions: 1.22 in x 0.79 in x 0.24 in (3.1 cm x 2.0 cm x 0.6 cm)

Aren't these things supposedly pretty high drain, even at 1-2 amps in parallel 5 of em could push up to 10 amps (I'm thinking normal resistance coils here)

Found this on a RC model group forum

The 'C' rating of a battery or battery pack is equal to the capacity to supply power for one hour. This is measured in Amperes or Amps. For example. your 4400 mA pack has a C rating of 4400 mA. Often the term 'C' is discussed as a measure of how much current can be drawn or charged back into a battery. For example the new crop of Lipo cells can have a current rating of 20C which means you can safely draw 20 times the capacity from the cell. In other words if you have a 1000 mA battery with a 20C rating you can draw 20 Amps (20,000 mA) from it. You may also see specifications stating a charge rate for a cell of 2C. Using the same 1000 mA battery as an example that would mean you can charge the battery at 2000 mA safely.

Doing the math on the above..they are individually capable of pushing 7200mA or 7.2 amps a piece...5 of em in parallel = 36 amps!!! (but not for very long!)

 

[Rickajho]

No! No! Bad! Those are lithium polymer - that's a low drain battery material! Besides, why would you want to put together such a contrapted package? Things like: how are you gonna get five of those suckers to all drain at the same rate at only 240 mAh capacity each? Let alone the charging issues a parallel pack like that poses. I know you know better! lol

 

[WarHawk-AVG]

No! No! Bad! Those are lithium polymer - that's a low drain battery material! Besides, why would you want to put together such a contrapted package? Things like: how are you gonna get five of those suckers to all drain at the same rate at only 240 mAh capacity each? Let alone the charging issues a parallel pack like that poses. I know you know better! lol

parallel charging...why would that be difficult...I mean if you are pushing CV/CC, parallel is same voltage, current divided by the cells (isn't that how a Nitecore 4 port v1 does it from 1/2 and 2/4? [manual says to make sure you put them in like that so the overall 750ma charge per channel is divided so you don't overdrive the charge capacity of your batteries]

And parallel discharge...add all the individual discharge rates together

Same as "stacking batteries" in a mod, but in parallel

Why would I want to? Why would a silly Chinese guy decide to put nicotine in a viscous solution of PG and VG and add flavoring, then use a nichrome wire to heat it so you could breath it

I'm not a modder persay...and usually these batteries push thru some tiny motors...and I know motors draw high current

P.S. Crack open a iTaste MVP some time...

 

[retird]

No! No! Bad! Those are lithium polymer - that's a low drain battery material! Besides, why would you want to put together such a contrapted package? Things like: how are you gonna get five of those suckers to all drain at the same rate at only 240 mAh capacity each? Let alone the charging issues a parallel pack like that poses. I know you know better! lol

These are low mah batteries (not the best choice).....I use Li-poly batteries without issue and have used for years.....

Question? you say li-po's are low drain material?????....please provide info.....the ones I've used can easily pump out 7 to 20 watts of power....I've been using a flat li-po (20C and 1200 mah) http://www.rcecho.com/5x-E-FLY-Mode...Li-Polymer-Lithium-Polymer-Battery-CA218.html in dna20d mods for over 9 months without issue...and my 2.5 year old Darwin uses 2 li-po's in parallel without issue....

The specs on the MVP say it has a 2600mah li-po battery....

 

[BardicDruid]

And you people who say it's good, do you have the ability and materials to build the regulation circuits to keep everything running without a thermal catastrophe????

 

[retird]

And you people who say it's good, do you have the ability and materials to build the regulation circuits to keep everything running without a thermal catastrophe????

What are your thoughts about using a properly sized li-po battery in the Darwin or in a mod using the DNA12, DNA20d, or the Kick (or Kick2)? Is it a setup for a "thermal catastrophe" when safe battery precautions and charging is utilized?

 

[Nermal]

The Darwin? Why would anyone name a product that is almost always followed by the word "Award".

 

[retird]

hum.....I guess because it's a winner....he-he....

 

[DrMA]

Actually, flat lipo's are currently the best rechargeable batteries available today in terms of energy density and discharge rating bar none. Sure they can be a bit pretentious - care, useage and charging, but if you take appropriate precautions, they are very safe and effective.

OP, don't get those puny lipos to connect in parallel; it's a complete waste. Get an appropriately-sized cell for your project. Here's a large selection right here from 50 to >6000mAh: Batteries & Accessories>Li-Poly (All brands)

 

[WarHawk-AVG]

Actually, flat lipo's are currently the best rechargeable batteries available today in terms of energy density and discharge rating bar none. Sure they can be a bit pretentious - care, useage and charging, but if you take appropriate precautions, they are very safe and effective.

OP, don't get those puny lipos to connect in parallel; it's a complete waste. Get an appropriately-sized cell for your project. Here's a large selection right here from 50 to >6000mAh: Batteries & Accessories>Li-Poly (All brands)

cool thanks

The reason I was asking about those batteries...they are 1.25~" square...5 of em stacked gives a 1.25"~ cube...teeny tiny!!!

nice link..but hmmm (all these different resellers selling practically the same thing)

http://www.hobbyking.com/hobbyking/store/__7568__ZIPPY_240mAh_20C_single_cell.html
1 cell..240mAh 20C single cell - $1.84

http://dx.com/p/502030-replacement-3-7v-240mah-30c-batteries-for-r-c-aircraft-white-5-pcs-244610
5 cells..240mAh 30C - $8.10

ooh...a whopping savings of $1.10 yay...I'm RICH!!

just an observation, and I really do appreciate your input

I was just spit balling my thoughts on something like this...was one of those "I wonder if" kinda things

 

[DrMA]

LiPo's are indeed a strange animal in the sense that bigger is always better. Tiny LiPos tend to have disproportionately higher internal impedance (IR) compared to larger ones. So let's say a mid-range 300mAh cell might have IR around 80mΩ, double the capacity (600 mAh), the IR doesn't just halve, it probably goes down to 30mΩ, go to 1200mAh, IR might be as low as 10mΩ, and a 2400mAh cell could be as low as 3mΩ; all from the same brand, factory and assembly line. So, with this example, if you stacked up 4 of the small 300mAh for a total capacity of 1200mAh, you'd still have to deal with 20mΩ IR (plus all the resistance of the connections), while if you went with a single 1200mAh cell you'd have half the IR and none of the wires and connections...