LiPo Battery real Capacity Test

by DivenParker | January 5, 2017 | (0) Posted in Reviews

When we bought lipo batteries for our drones, we can see that there are battery parameters on the battery pack, for example, if you need to buy a 2200mAh 3S 25C lipo battery, you can get the battery parameters from the wrapping paper; but how do you sure the parameters of battery are true ? Does the battery’s weight, capacity, voltage are true? So I do a battery capacity test to get the real capacity of the battery. I borrowed some different kinds of brand lipo batteries from my friends and test them.

About these test batteries, they are different brands and parameters, and then I will introduce them to you. These brand batteries are Gen Ace, Venom, Traxxas, Rage RC and Glacier.

Gens Ace

There are 3 Gens Ace Lipo battery:

Gens Ace 5000mAh 7.4V 50C 2S lipo battery:

Minimum Capacity: 5000mAh

Configuration: 2S1P/7.4V /2 Cells

Discharge Rate: 50C

Max Burst discharge Rate: 100C

Price: 32$

Gens Ace 5000mAh 14.8V 50C 4s lipo battery:

Minimum Capacity: 5000mAh

Configuration: 4S1P/14.8V /4Cells

Discharge Rate: 50C

Max Burst discharge Rate: 100C

Price: 63$

Gens Ace (soft) 5000mAh 22.2V 45C 6s lipo battery:

Minimum Capacity: 5000mAh

Voltage: 6S1P / 22.2V / 6Cells

Discharge Rate: 50C

Max Burst discharge Rate: 90C

Price: 92$

Rage RC

Rage RC 5200mAh 2s 30C lipo battery:

Minimum Capacity: 5200mAh

Voltage: 2s/ 7.4V/ 2cells

Discharge rate: 30C

Max Burst discharge Rate: Unknown

Price: 32$

Venom power

Venom 5000mAH 7.4V 25C 2S lipo battery:

Minimum Capacity: 5000mAh

Voltage: 2s/ 7.4V/ 2cells

Discharge rate: 25C

Max Burst discharge Rate: 40C

Price: 49$

Venom 10000mAH 7.4V 35C 2s lipo battery:

Minimum Capacity: 10000mAh

Voltage: 2s/ 7.4V/ 2cells

Discharge rate: 35C

Max Burst discharge Rate: 50C

Price: 90$

Traxxas

Traxxas 5000mAh 11.1V 25C 3S lipo battery:

Minimum Capacity: 5000mAh

Voltage: 3s/ 11.1V/ 3cells

Discharge rate: 25C

Max Burst discharge Rate: 50C

Price: 75$

Glacier

Glacier 5000mAH 14.8V 55C 4s lipo battery:

Minimum Capacity: 5000mAh

Voltage: 4s/ 14.8V/ 4cells

Discharge rate: 55C

Max Burst discharge Rate: Unknown

Price: 86$

And I have tested each one battery, this is an example of the final cycle on charging the Gens Ace 5000mAh 22.2V 50C 6S lipo battery:

I've kept notes on actual measured capacity vs. rated capacity. I just thought I would share them here. As I come across (or borrow from friends/family) more batteries I'll update this post. New packs were cycled 3 times before obtaining results, all charges were done to 4.20v TVC using a C/2 charge (2.5A on a 5000mAh pack for example). Keep in mind the amount of time a pack was on a shelf (age), number of cycles on a used pack, and manufacturing tolerances - can all have an impact on the results so these should be taken with a grain of salt, as ymmv. 

These are the result of the battery capacity and complete to their rate:

Battery     Cells    C-Rate   New/Used   Rated      Measured
Rage RC     2S       30C      New     5200mAh     4910mAh
Gens Ace    2S       50C      New     5000mAh     5113mAh
Venom      2S       25C      New     5000mAh     4992mAh
Venom      2S       35C      New     10000mAh    9420mAh
Traxxas     3S       25C  Used (15 cycles)5000mAh     4637mAh
Glacier     4S       55C      New     5000mAh     5370mAh
Gens Ace    4S       50C      New     5000mAh     5282mAh
Gens Ace(soft)6S       45C      New     5000mAh     5617mAh

I hope to be able to test some SMC or SPC batteries in the future, but from these result, we can find Gens Ace and Glacier batteries are expensive, but their measured capacity are larger than rated capacity, and like the Venom, Traxxas and Rage RC are cheap, so their measured capacity are lower than rated capacity; and I have completed their price. So one thing I notice is that the more expensive brands (Glacier & Gens Ace) seem to under-rate the capacity so its a bit of a you get what you pay for situation. So I get a conclusion, not every battery are reliable, trying to save money on batteries is something I wouldn't recommend. And at last, I want to tell you: this is just my personal opinion, I only take the matter on its merits. many brands batteries measured capacity are not very true.






COMMENTS

flyinggreek on January 23, 2017
Being lower than rate is one thing, but being higher than rate, especially the amount a couple of those have shown, could also be a problem I would think. Wouldn't it?
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DivenParker on February 4, 2017
Maybe it is, but if only the capacity higher than rate, it is nothing serious.
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logger1492 on December 31, 2017
Battery capacity is comparable to a water reservoir's capacity while the voltage is comparable to the water pressure. High (voltage) pressure can burst your pipes. With a bigger reservoir you can (fly longer) wash more cars.
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royp on September 7, 2017
Capacity measurements are affected by discharge rate. You didn't say what discharge rate you used. Did you use something like 5C or 10C, or by a certain amperage? I test my batteries with a West Mountain Radio Computerized Battery Analyzer to see how they're holding up, and I basically do a stress test on them and discharge at 10 amps for 1300mah and up (the CBA can only handle 150 watts). At this rate most brands measure out at about 90% of their labeled rating -- no matter what they cost.
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LiPo Battery real Capacity Test