Ovonic Memorial Day Deal for LiPo Batteries, Up to 50% off

Memorial Day, also known as Decoration Day is an important and meaningful holiday for us American. It’s the great day not only to honor those who have lost their lives while serving in the U.S. armed forces but also to spend with your family and friends. Besides, it’s usually regarded as the start of the summer season.

But except for these activities, what else can we do? Exactly, RC hobby is a perfect option for you. Flying your RC airplane with your children and sharing the stories that happened in the war with your family. That is really a good way to pay tribute to those who have lost their lives fighting for our country and spend meaningful time with our family.

Therefore, for the important Memorial Day, Ampow gives the best Memorial day sales 2019 and provides an Extreme Deal for RC hobby batteries. Good news for us Hobbyists! This activity will last 10 days from 27th May to 5th June.

Buy 3 Get 1 Free: FPV Batteries

If you buy 3 packs of FPV batteries, you will get a free one. FPV batteries cover Ovonic 1300mah to 1550mah, from 3S to 6S.

Up to 50% off for RC Airplane Batteries

In addition, there is a great discount and airplane batteries. Especially for RC airplane batteries, You’ll save a whopping 50%. great deals on battery for small foam plane, park flyer, glider, X-class drone, and 64mm-80mm EDF jet and more. So What are you still waiting for?

Great deal on RC Car Batteries

Last but not least, for RC car, here are most popular 2s lipo batteries such as Ovonic 5000mah/5200mah 2s for your 1/10 and some of 1/8 RC car trucks, such as short course, monster truck, buggy etc.

As to 3s, there also have great deals like 4500mah 3s,5200mah 3s,5500mah 3s. 4500mah 3s with 135mm*40mm*25mm(L*W*H) battery dimension for most of 1/10 monster truck, crawler etc.

5500mah 3s with a larger capacity and longer size(155mm of length), great for some model with larger battery tray, such as 1/10 slash, E-Revo, 1/8 axial yeti, etc. 5200mah 3s with EC3 can be fit for most of losi 1/10 truck.

Check deals now: https://www.ampow.com/memorial-day-sale

GensAce 2200mah 25C LiPo Review and Testing

Since the GensAce 2200mah 3S 25C batteries were on a significant sale recently, I picked up two to do a bit of testing. I spent a couple of days gathering data, and here are the results. 

To give a bit of background, I am a multirotor pilot, and am primarily interested in miniquads. That being said the testing I've done applies universally, and the 2200mah size battery is very adaptable to general use in mini quads, 450 class multirotors, small helicopters, and airplanes, RC crawlers etc. 



For this test, I've done some stress testing and general data collection with this battery, and for comparison purposes a Turnigy 2200mah 35C as well. I began by testing the internal resistance of the battery. I also did a current draw test on both batteries at 25A to measure the voltage drop. Finally Irecorded a flight with an onboard current and voltage sensor in the OSD to demonstrate voltage drop in real-world flight conditions.

Physical Characteristics

My first impressions of this battery are very positive. The battery is very solid and well built. There is a very thin aluminum support that surrounds the battery and adds additional protection to the top, back, and bottom of the battery. This protective layer doesn't extend down the sides however. Where the high current lines enter the battery casing they are re-enforced with additional heat shrink. The balance leads come out the opposite side of the casing rather than the same side as the high current lines. This battery did come with 4mm bullet connectors, which I had to cut and resolder to my standard XT60. The battery weighs in at 190g with the factory connector and 187g after being modified with the XT60.
 
Internal Resistance
As a first test I measured the IR of the battery in several conditions. I tested at both full voltage, storage voltage, and full discharge after a flight. I used this tool to estimate the C rating and constant average amp draw for the battery. It is worth noting that the post flight battery was quite warm, and that does effect IR quite a bit.

Scenario (GensAce) ........ IR(mOhm) ........ Amps(avg) ........ C(avg)
Full Charge (75F) ................... 3.3 .................... 63 ...................... 29
Storage Charge (75F) ............ 3.2 .................... 64 ...................... 29
Nominal Charge (95F)........... 2.8 .................... 69 ...................... 31

As you can see all of the average C ratings were well above the listed 25C rating from the factory.

For comparision here is the data for the Turnigy 2200mah 35C battery.

Scenario (Turnigy) ........ IR(mOhm) ........Amps(avg) ........ C(avg)
Full Charge (75F) ................... 3.5..................... 61 .................... 28
Full Charge (95F) ................... 2.2 ....................71 ..................... 35
Storage Charge (75F) .......... 3.4 ................... 62 ..................... 28

Load Testing

I wired the battery up to a 25A load to test voltage drop. At the top of the battery the voltage dropped mostly linearly at a rate of 0.03V per A. That leads to a projected drop of 1.5V at a 50A load.

The flight video shows a voltage drop of about 1.7A at 50A which is very close given the drop in efficiency as the current increases. The battery was cool to the touch after 25A (1C) tests, and only slightly warm after flight testing. Load handling appears to be consistent with the projections based on IR measurement. Flight times are around 5 minutes on my Cobra 2204 2300kv motors pushing 5x4.5 bullnose props with punchouts drawing 50+ amps and average flying drawing 15-20A.

GensAce 2200mah 25C Flight Test (6 min 5 sec)

For comparison, the Turnigy battery performed basically the same with a 0.0325V per A drop.

Conclusions

These batteries are very well made and seem to be well rated, meeting or exceeding the factory 25C specification. Time will tell if that C rating drifts after regular use and abuse, but from initial flight tests, I am optimistic. The weight and size are better than many other 2200mah batteries as well, which works out well for miniquads. Overall I am impressed with the quality and performance of the battery and am looking forward to some long-term results. For those interested, the battery is available here: https://www.ampow.com/gens-ace-25c-2200mah-3s1p-deans-lipo-battery.html

Battery review: Ovonic 2s 5000mAh 50C 2S LiPo battery Pack from Ampow

This is the new OVONIC 2s 5000mAh 50C LiPo battery pack from Ampow. The battery features a hard case design with a 12-gauge pre-wired Deans (T-style) connector and JST-XH balance charge connector. It is rated with a 50C discharge and 100C max burst discharge rate. The battery is a standard “stick pack” with dimensions of 137mm x 45mm x 24mm and weighs in at 302 grams.

This 5000mah lipo battery pack is ideal 1/10-scale off-road vehicles which use a full-length battery pack (such as short course trucks, monster trucks, and rock crawlers). 

This battery pack provided ample run-time in our Traxxas 2wd Slash with a modified motor, and remains well balanced and consistent charge after charge.

Specifications (provided by Ampow):

• Brand: Ovonic 
• Chemistry: Li-polymer
• Cells Number: 2S
• Voltage(V): 7.4V 
• Capacity(mAh): 5000mAh 
• Discharge: 50C 
• Max Burst Discharge Rate (C): 100C 
• Charge Plug: JST-XH
• Discharge Plug: Deans Plug
• Battery Weight(dev.20g): 302g 
• Battery Dimension: 137x45x24mm 
• Wire Gauge: AWG12# 
• Wire Length(mm): 115mm

Pros:

• Very reasonably priced at only $24.99.
• Plug and play with pre-wired connectors.
• Clear shrink-wrapped hard case design.
• Fits most 1/10-scale short course trucks, monster trucks, and rock crawlers.

Cons:

• Balance plug has a bulky protection clip that can make placement in the car difficult without removing it.

Final Word:

While this is not our first pick for serious competition, this battery pack works great for someone who is looking to go backyard bashing, upgrade from a NiMh battery pack, and/or looking for a budget-friendly LiPo battery pack.