Youme 6S Lipo Battery,22.2V 4500mAh Lipo Battery 60C with EC5 Plug for X Class Drone Racing 70MM 80MM 90MM EDF RC Quadcopter Airplane Helicopter Car Truck Boat Hobby (2 Packs)

Shipment arrived quickly. The packs arrived well balanced and at storage charge.I flew these in an EFlite twin 64mm A-10 Thunderbolt 2 for 3 cycles each before charge/discharge testing them. My throttle settings were between 1/2 and 3/4, using normal kinetic energy management for scale flying. The packs came down mildly warm, discharged to 3.8V/cell. In RC aircraft, it is advisable to allow for go arounds on missed approaches/landings. Also, I prefer to land at storage charge; it simplifies battery storage/management. Flight times were around 4 minutes, 50 seconds. This was perfectly acceptable performance for me, given what I paid. Your mileage may vary...After flight cycling, the packs were once again balance charged, using an ISDT SC-620 balance charger with internal resistance measurement capability, then discharged on a Maynuo programmable DC load with a mAH totalizer built in.Controlled charge/discharge test results:- Internal Resistance/cell averaged 6.5 milliOhm- Charge Voltage 4.20V/cell- Discharge voltage cutoff 19.2V, or 3.2V/cell- Discharge current 4.95A (unbalanced)- Recovery voltage after discharge was 20.05V, or 3.34V/cell- 4320 mAH flowed during discharge testing to 3.2V. This was reasonably close to the claimed 4500mAH capacity at 3.2V/cell. However, other pack brands I have tested perform better, having 80% or more of the stated capacity when discharged to 3.6V/cell. This is probably the reason these are cheaper than other brands. You get what you pay for, but Youme Power didn't lie.

I run these in my Arrma Kraton 6s and Notorious 6s and I get 40+ min of hard drive time easily and they have a punch like no other. Definitely way better than my spektrum batteries. I have since bought several more and is one of only 2 brands I use now.

Capacity of batteries are listed at 4500mah, after a flight there was 9% left, after charging it only took 2400mah to reach 100%, way under the rated capacity. Don't waste your money or time on this product.

These are pretty good batteries in my experience, I run them in my heavily modified Arrma Kraton 6S. I have an upgraded thicker (heavier) chassis and I like these batteries because they are lightweight compared to a 5200mah or 6000mah that a lot of guys like to run. These 6S packs are the best deal anywhere I've found that are beefy enough for my purpose. You can get 4 of these for the same price or less than 2 of some other brands. I have had one small issue, and it is totally my fault but I wanted to share it anyway: be extra careful about storage charging these ASAP if you're not going to use them right away. I left them charged up for about 24-36 hours twice and now each one has a lazy cell with higher internal resistance that won't fully charge. I have 4 3S packs from 2 other brands that have not had this issue, at least not after a day. Not only do these packs no longer want to perfectly balance, but my Kraton hits thermal shutoff much more quickly now. Also at the end of a run both of the batteries get fairly warm to the touch, which is a symptom of a high IR. Again, it was my fault, I knew better than to leave them fully charged for a day and a half but I feel like my other packs have been a bit more forgiving in this regard. I'm considering opening them up and making a 6s and a 4s pack out of them by removing the lazy cells and combining one cell off of one with the other. These are decent packs but seem to be a bit fragile when it comes to storage charging. It's also possible I got lucky with my 3S packs that haven't had any issues with similar treatment.*Update:So I've been using these packs as my main bashing packs in my Kraton 6S and I've had 2 other issues so far:1) On both of my packs the metal tab that the positive lead is soldered to has separated from the positive terminal flap on the 6th cell. Ive been able to repair them by using an awl to punch small holes in the last cell's positive flap/tab and stitching the metal tab back on with strands from copper wire, then soldering the strands to increase contact area and durability of the repair. Seems stronger than the original way these were attached, but this should not have happened. I always make sure there is a bit of slack on the power wires so they should not be pulling on the pack. I think it might have pulled off from the little bit of slack pulling on the pack during landings. I jump my Kraton really aggressively and it seems these packs are not really made for heavy bashing. My 3s packs from Zop and HRB have been fine, but they also fit into the battery tray on their side instead of flat so that may help.2)I recently upgraded my motor to a Rocket 4092 1650KV and my ESC to a Hobbywing Max6. These are fairly common upgrades for guys doing similar "Mega Basher" Kraton builds to mine. My setup is similar to and based off of Rich Duperbash's setup that he's shown many times on YouTube and on ArrmaForum.com. It seems since I swapped motors the car has a bit of a delay before full power comes on. Like 1/10th or 1/5 of a second, then it goes hard. I was expecting standing backflips but no dice. I think these packs aren't quite capable of the claimed 60C which would be 270 amps continuous. The motor and ESC are both rated for 160a continuous, with the motor being rated up to 4200w, which on 6S power should be 168 amps. The stock motor was really strong and the power was instant on the same esc and batteries, so it may be possible that my motor has some kind of fault. Not sure what that would be however. These packs are awesome on the stock Arrma 6S setup and with a stock 2050KV 6S motor running on a Hobbywing Max6 ESC.

Product works, holds charge, priced well

I'm using these on an flex innovations cap 232 and this thing 3Ds with the best of my gas plane. These batteries charge evenly and deliver more than enough power to drive my Potenza 60. I'll be buying more.

I bought two 6s 4500 and these aren't even close to 4500 mah. I would say closer to 3300. I have other 4500 thatI fly in the same aircraft and they all come down around 3.83/per cell after a 4:30 timer. These come down with only 3.66 every time. I fly consistent and these always come down with way less then the others. I wouldn't buy again. False advertising. I added these pictures. One was down to 9% I charged it to 100%, but only added 2450mah. How can that be a 4500? It's closer to a 6S 3000.Update: Customer support reached out to me and offered a partial refund, or full refund if I returned them. I decided to keep them and receive a partial refund. I now fly these in a smaller aircraft. Very good customer support.

Batteries have preformed well