Archive for the ‘Li-Po/Ion/Fe Batteries’ Category

2s-7-4v-800-mah-gens-ace-20c-lipo-battery

The 2S 7.4V 800 mAh Gens Ace 20C LiPo batteries are intended for use in various RC models such as helicopters and planes. These compact LiPo batteries have a pretty high discharge and charge ratings that we need to confirm in our tests. What is important to note is that the maximum discharge rates mentioned in the specifications are for quite high Amps and the small cables and connectors of the battery may not be able to handle them well.

Official Battery Specifications:

– Capacity: 800mAh
– Voltage: 7.4V
– Max Continuous Discharge: 20C (16A)
– Max Burst Discharge: 40C (32A)
– Weight: 50g
– Dimensions: 56.37×30.74×18.76 mm
– Balance Plug: JST-XH
– Discharge Plug: JST
– Charge Rate: 1-3C Recommended, 5C Max


2s-7-4v-800-mah-gens-ace-20c-lipo-battery-capacity

Starting the tests with a 1C discharge rate (0.8A) for the 2S 7.4V 800 mAh Gens Ace 20C LiPo battery we’ve managed to get 793 mAh as a maximum capacity which is a bit short from the rated capacity of 800 mAh though at less than 1% it is not a problem. Going for higher discharge rate the battery still manages to offer very good capacity even at 20C it handles pretty well with 749 mAh useable capacity. The problem however is that at 20C constant current discharge rate the cables of the battery get way too hot, we’ve measured 98 degrees Celsius and that is way too high. The cables getting hot are just an indication that the current passing through them is more than what they can safely handle.

The performance of the 2S 7.4V 800 mAh Gens Ace 20C LiPo Battery in our tests:

– 793 mAh at 0.8A load (1C)
– 784 mAh at 4.0A load (5C)
– 774 mAh at 8.0A load (10C)
– 765 mAh at 12A load (15C)
– 749 mAh at 16A load (20C)

While the 2S 7.4V 800 mAh Gens Ace 20C LiPo batteries are capable of handling a constant discharge rate of 20C as their specifications say the battery cables used are not desgned to properly handle the 20C constant discharge rate!

2s-7-4v-250-mah-gens-ace-30c-lipo-battery

The 2S 7.4V 250 mAh Gens Ace 30C LiPo batteries are compact batteries often used in small scale flying radio controlled models such as RC planes and helicopters. These small batteries have a pretty high discharge and charge ratings that we need to confirm in our tests. What is important to note for this particular battery is that it is a 2 cell battery, but there is no balance plug, only a JST discharge one that brings out the combined voltage from the two cells. While this normally should not be a big problem, not having a balance connector may shorten the life of the battery if the cells become more and more disbalanced over time.

Official Battery Specifications:

– Capacity: 250mAh
– Voltage: 7.4V
– Max Continuous Discharge: 30C (7.5A)
– Max Burst Discharge: 60C (15A)
– Weight: 18g
– Dimensions: 38,5mm*25,12mm*10,5mm
– Balance Plug: N/A
– Discharge Plug: JST
– Charge Rate: 1-3C Recommended, 5C Max


2s-7-4v-250-mah-gens-ace-30c-lipo-battery-capacity

Time for the actual tests, starting with a 1C discharge rate (0.25A) for the 2S 7.4V 250 mAh Gens Ace 30C LiPo battery we’ve managed to get 264 mAh as a maximum capacity which is a value a bit higher than the rated 250 mAh capacity for the battery, so definitely a good thing. Furthermore at up to 20C discharge rate the battery still manages to provide more than the rated 250 mAh capacity and at 25C and 30C the capacity you can get is just a bit less than 250, but still quite close to that value. So the 30C constant discharge rate is confirmed, however we’ve decided not to go for tests at up to 60C that the battery is supposedly able to handle. The reason for that is the fact that at 25C discharge rate the battery had a temperature of 65 degrees Celsius and at 30C it got up to 71 which is out of the safety zone for working temperature.

The performance of the 2S 7.4V 250 mAh Gens Ace 30C LiPo Battery in our tests:

– 264 mAh at 0.25A load (1C)
– 263 mAh at 1.25A load (5C)
– 261 mAh at 2.50A load (10C)
– 255 mAh at 3.75A load (15C)
– 255 mAh at 5.00A load (20C)
– 244 mAh at 6.25A load (25C)
– 234 mAh at 7.50A load (30C)

We can conclude that the 2S 7.4V 250 mAh Gens Ace 30C LiPo batteries are performing very good and meet their specs, the only thing to note is that if you are going to be pushing to their maximum you should make sure they are cooled properly (at 25C-30C discharge rates).

3s-11-1v-180-mah-turnigy-nano-tech-25-40c-lipo-battery

The 3S 11.1V 180 mAh Turnigy Nano-Tech 25-40C LiPo batteries are one of the smallest 3-cell Lithium-Polymer batteries available used in small-scale radio controlled models such as mini and micro cars and planes. Not to mention that these Turnigy batteries are available at a quite attractive price at hobby King, so you can buy more just to have a few spares. Of course if they are able to handle the high discharge rates that they are rated at – 25C constant and 40C burst, they could be really great, however still need to check it along with the capacity they can provide.

Official Battery Specifications:

– Capacity: 180mAh
– Voltage: 3S1P / 3 Cell / 11.1V
– Discharge: 25C Constant / 40C Burst
– Weight: 19g (including wire, plug & case)
– Dimensions: 35x20x15mm
– Balance Plug: JST-XH
– Discharge Plug: JST


3s-11-1v-180-mah-turnigy-nano-tech-25-40c-lipo-battery-capacity

Time for the actual tests, starting with a 1C discharge rate (0.18A) for the 3S 11.1V 180 mAh Turnigy Nano-Tech 25-40C LiPo battery we’ve managed to get 173 mAh as a maximum capacity and that is a bit short from the 180 mAh rating, though quite close to what it should’ve been. Moving to higher discharge rates such as 5C interestingly enough the battery was able to supply 182 mAh and 179 mAh at 10C discharge rate, apparently due to the fact that the temperature of the LiPo cells increases and the internal resistance gets lower at the higher discharge rate unlike at 1C. The temperature of the battery remains in the safe zone 55 degrees Celsius at 15C and 20C discharge rates and at 25C it gets a bit too hot at 73 degrees Celsius (out of the safe zone of up to 60) while still providing 165 mAh.

The performance of the 3S 11.1V 180 mAh Turnigy Nano-Tech 25-40C LiPo Battery in our tests:

– 173 mAh at 0.18A load (1C)
– 182 mAh at 0.90A load (5C)
– 179 mAh at 1.80A load (10C)
– 171 mAh at 2.70A load (15C)
– 170 mAh at 3.60A load (20C)
– 165 mAh at 4.50A load (25C)

We would not recommend using this battery at more than 20C for constant discharge rate, though the 3S 11.1V 180 mAh Turnigy Nano-Tech 25-40C LiPo battery may work well at 25C if properly cooled for example in a RC plane. In overall good performance and results that pretty much match the specs of the battery, though with some things that you should have in mind. Getting the battery too hot can permanently damage it or cause it to start a fire!


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