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

A Profile of Ovonic Brand

Ovonic, founded in 2017, aims to build a direct to customer online battery brand and to create an easier solution for newcomers to break into the RC world. Ovonic prides itself withthe best prices and multi-choice of batteries to power up all forms of RC’s from land to air.


OVONIC Batteries


Company Mission​
Our mission is to bring real fun to this community without the high price tag. With our high discharge, high quality, and great prices, our batteries will allow every hobbyist to enjoy the incredible power, speed, and pleasure while playing with their friends or even training alone.




Committed to Solving Issues​
Not only are we committed to the high quality of our batteries but we also prioritize our RC related issues by keeping knit bonds with RC hobbyists. We take serious consideration of the ever-changing needs of our customers and constantly strive to improve our batteries for our community.


Team Ovonic​
We love RC and everyone and anyone who loves RC. We built an amazing team - Team Ovonic. Who are our members? David Graves, Jeff Bates, Luiz Rena Meireles - fpv, Mako Reactra, and Justin Kent Furnis! They love the RC community and are constantly challenge themselves to keep improving and to push the boundaries of FPV further. We will announce more pilots and drivers in the coming days. Now, let’s tackle different types of challenges ahead of us together, so that we may grow and improves a team!

Overview​
As an emerging battery brand, Ovonic has been lucky enough to be recognized by RC hobbyists that we are a trustworthy and high-quality brand. All we ask is people to give our batteries a try, and most people are impressed with the high performance and the amazing price point.

The source from: https://www.ampow.com/about-us

Tattu 1800mah 4S 75C Review and Testing

I was recently sent one of the new Tattu 4S 1800mah 75C batteries to do a bit of testing. I've been flying it for a week or so and I have spent some time gathering data. Here is what I've found so far. 

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. These high C rated batteries are useful beyond the bounds of multirotors into the world of 3D flying, and high-performance aircraft.

For this test I've done some stress testing (and unintentional abuse!) and general data collection with this battery, and for comparison purposes a Dinogy 1800mah 65C as well. I did a current draw test on both batteries at 25A to measure voltage drop. For now, I have skipped the internal resistance test as my current tester seems to be giving unreliable results. I will post an update as soon as I get some reliable results. Finally, I recorded a flight with an onboard current and voltage sensor in the OSD to demonstrate voltage drop in real-world flight conditions.

Physical Characteristics

As with the GensAce 2200mah I reviewed last week, my first impressions of this battery are very positive. GensAce/Tattu seem to use the same build techniques in both their lower discharge and higher discharge batteries. It has the same aluminum support that covers the battery and adds additional protection to the top and bottom of the battery. After a bit more research I have found that this actually provides compression during high discharge and according to research can significantly extend the life of the battery. Again, where the high current lines enter the battery casing they are re-enforced with additional heat shrink. The balance leads also come out the opposite side of the casing rather than the same side as the high current lines. In addition this battery has a plastic cover that extends over the balance lead cables, preventing stress on the cables when plugging and unplugging the balance cable. I will point out that on some chargers this can prevent the balance leads from fitting properly. Unlike the 2200mah, this battery came with XT60 connectors, which means no soldering for me. Battery dimensions actually exactly the same as the 2200mah 3S, and are accurate to the product description on the sellers website. The wight is just over 200g and the physical size is 105mm x 35mm x 25mm. Because of the aluminum plates, the size is very consistent.

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 0.037V per A. That leads to a projected drop of 1.9V at a 50A load.

The flight video shows a voltage drop of about 1.5V at 65A which is actually a good deal higher than the projected ratings. Granted this sag was at the top of the battery, and this was the batteries first flight, however it leads me to believe that the performance of these batteries increases as the amp draw increases. It appears to be a factor of the carbon nano-polymer used to increase the C rating. 

Also it is worth noting that on this first flight test, I got a bit caught up in flying and pushed it a bit harder than I was planning. The battery came down screaming hot and a tad unbalanced at 0.10V maxium variance between cells. However after a few hours of cool down the battery was back to withing a 0.03V maximum variance. After a slow charge the battery was perfectly balanced. After several additional flights there seem to be no ill results from the abuse on the initial discharge. I am very impressed with the handling of the abuse!

Tattu 1800mah 75C Load Testing (5 min 14 sec)

Comparison Load Test
For comparison the Dinogy battery performed slightly worse with a 0.043V per A drop.

Conclusions

My initial impressions of these batteries both in build quality and performance are very positive. Because of the very high C rating, it is hard to get an accurate picture of whether or not this battery can fullfill a 75C (135A) current load, but given very few people have a setup that can draw that type of constant load, that's not something we can easily gauge. Since I haven't found a reliable method for testing internal resistance (other than the load tests above) It's hard to get an objective measurement of true C rating. I will post an update as soon as I can test these on a more reliable tester. I can say up to 65A loads this battery performs excellently. I was also very impressed with how well it recovered from first time abuse.

The battery provides both solid performance and the extras in the build such as the reinforced cables and aluminum compression plates add up to a very nice battery. However that battery does come at a premium price compared to other similarly rated batteries. For those interested, the battery is available here: https://www.ampow.com/tattu-75c-1800mah-4s1p-xt60-lipo-battery.html

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.