Spektrum RC 2S Hard Case LiPo 120C Shorty LiPo Battery (7.6V/6300mAh) w/5mm Bullets

Can't speak to the quality but gets uniformly good ratings. I do want to comment on Amain customer service however. Bought two of these batteries and followed the shipment tracking. Said they were delivered but they were not, either lost or maybe delivered to the wrong address. Without question, Amain immediately sent out replacements free of charge and picked up the shipping cost as well. Doesn't get any better than this.

The battery weight to power ratio is excellent and the build quality is excellent as well. I’ve tested the new Spektrum Smart Pro 6300mAh LiHV battery against a Maclan 6400mAh LiHV battery, a Protek 6400mAh LiHV battery, and lastly a Fantom 6400mAh LiHV battery. In my opinion they all performed the same. The tempatures after use felt the same, the weight on the Spektrum is 19g lighter then all the other batteries, the time the batteries lasted was the same. The 100mAh difference makes absolutely zero difference. As of this review the price is 20% less for the Spektrum Smart Pro batteries than the competitors batteries I tested. Now for the reason I couldn’t give this battery review 5 stars. First reason is it’s not ROAR approved. Secondly I feel a little mislead by how Spektrum markets it as a G2 smart battery. It’s more like half smart because you have to plug in the balance connector. I understand having to plug in a 3rd cable to the battery…Two 5mm bullets and a 3rd balance. This makes sense obviously, but you would think the IC5/IC3 connector would relay the balance information. Unfortunately, this is not the case and you need to plug in the balance connector as well or you will get an error. After everything is connected though it’s SMART like your used to….picking charge setting automatically, battery diagnostics and health, auto discharge, etc. So I have to hookup the battery like all the competitors. If the battery wasn’t 20% less then the competitors I would feel a little more advertised simplicity deceived. In summary these batteries are the best 6300/6400mAh LiHV Shorties available. I plan on using these exclusively going forward and also stocking up before they raise the price.

So far very pleased have a couple runs on this battery and all good so far

Out of all my batteries in the past I have always had good luck with Spektrum. With many of my RTR packs having over 100 cycles on them and still working as good as new. First, I went with another well know battery brand for my 1/8 scale race application but almost immediately had one puff. I then decided to give these a try. They are the lightest battery I have found on the market (198-201g). Which is almost 25g lighter than the average competitor. Most are going to be running these in a saddle configuration so times that weight savings x2. They are very powerful and have a ton of punch. Last plenty long enough for my 1/8 scale truggy (off road race application) and have a really nice case. The charge lead is well made and it's nice that every pack you order comes with one. There is a comment stating they are not ROAR approved, but Spektrum does claim they are in the description, so I'm not exactly positive on that. I will say the balance port on the battery is different than all other brands. It seems fine and sturdy, I don't expect to have any issues with them, but I will report back if those changes. This is now my go to battery.

Its really a shame that Spektrum ruined what could have been a great battery with this worthless balance plug. It will wear out within less than 10 charges and then is a complete nightmare to try and get the battery to charge. DO NOT PURCHACE until Spektrum redesigns this plug.