ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh) w/5mm Connector (ROAR Approved)

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ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
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ProTek RC 4 Cell LiPo Battery 15.2V High-Voltage Performance

The ProTek R/C 4S 120C Graphene + HV 6500mAh LiPo Battery is a great battery option for anyone looking for a high capacity, high output 4S battery. Weighing 578 grams, the 4S HV is lighter than a standard 4S pack, with much higher capacity. This provides more runtime, and a dramatic increase in voltage and punch over the course of a run.

This battery is designed to have improved power to weight ratios while maintaining a low CG. The improved efficiency of this pack will allow for lower operating temperatures and lower internal resistance. This gives users a more consistent battery pack. ProTek Graphene + 120C Packs deliver the power needed by serious racers and enthusiasts alike.

Lab testing has shown that ProTek R/C Silicon Graphene packs have double the cycle life when charged at 1C rates, and can be charged at higher amp rates, with less risk of damage to the pack. More importantly, the discharge curve is flatter, meaning the cells maintain higher voltage throughout the discharge cycle with no significant drop off. Additionally, when compared to conventional LiPo batteries Silicon Graphene batteries are lighter, providing a higher capacity per gram ratio. With 7.6V nominal voltage, 120C discharge ratings, incredibly high charge rates and ten different models to choose from, ProTek R/C 120C Graphene + packs are perfect for racers and bashers that demand the absolute best.


  • Lighter than a hardcase 4S LiPo pack of equal capacity
  • Improved efficiency, lower operating temperatures, and lower internal resistance!
  • More runtime, with a dramatic increase in voltage and punch
  • Silicone Graphene can handle more abuse and deliver more current than a standard LiPo battery
  • Perfect for stock class racers looking to shave grams
  • 10C max charge rates - 1C charge rate recommended for longest life


  • DO NOT leave a battery in your model when charging
  • DO NOT leave lithium batteries unattended when charging
  • ALWAYS balance charge lithium battery
  • ALWAYS use a LiPo Safe charging bag/box
  • YOU MUST use a Li-Poly specific charger to charge lithium batteries (NiMH or NiCD only chargers WILL NOT WORK!)
  • YOU MUST not over discharge lithium battery packs
  • READ & UNDERSTAND the instructions carefully before operating this battery

NOTE: When using high energy Li-Polymer Batteries, please do not over-discharge or over-charge batteries as this will result in overheated batteries. Discharging capacity can't exceed 80% of the max capacity of the pack after full charging to ensure a good cycle performance. It is recommended to fully charge a brand new battery before using and only discharge the battery 50% for the first 5 cycles. Always monitor race time and/or set a low voltage warning on ESC (End voltage cannot be lower than 3.2v per cell). Do not use a battery that has too low a voltage. Do not expose batteries to sunshine or store/charge batteries at temperatures above 35°C or in a closed car. The high-temperature environment could cause damage to the pack or make it burst. If the battery becomes hot while fast charging, high current discharging, or racing, do not charge it until it has cooled completely. Wait about 20 mins, then inspect prior to recharging.


  • (1) ProTek R/C LiPo Battery
  • (2) 5mm Bullet Connectors
  • (2) 5mm to 4mm Reducer Bullet Connectors
  • (1) 4S Balance Lead
  • NOTE: This battery is not recommended for high current draw 8S applications.


Nominal Voltage: 15.2V (4S)
Capacity: 6500mAh
Maximum Charge Rate: 10C (65A)
Discharge Rates
Continuous: (Not Available)
Peak: 120C
Cell Configuration: 4S2P
Watt Hours: 98.8Wh
ROAR Approved: Yes
Battery: 5mm Bullet
Balance: XH4S
Dimensions (LxWxH): 1.89x5.43x1.89in (48x138x48mm)
Weight: 20.39oz (578g)

Battery Manual

Warranty Information

This product was added to our catalog on January 24, 2022

Andre Bender
Verified Owner
Thursday, Jul 7 2022 (about a year ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Just dropped a cell out of no where had it for 4 months always leave my batteries storage charge around 14.8 went to charge and the number 1 cell wouldn’t read
Tyler Clontz
Monday, Jun 20 2022 (about a year ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I’m really disappointed. This is the most expensive battery I’ve ever bought, it’s the newest battery I have, and it’s the first battery I’ve had from ProTek to fail. I don’t even have many runs on this pack! When I first got it, I felt it’s mah rating was wrong. I have the 5600 as well and it lasts a bit longer. Maybe the extra weight and mass of this 6500 makes the car work harder? Not a scientist though. All I can say this 6500, cell 1 has died. Battery is useless to run because that cell drops to dangerous levels right away. Hoping I just got unlucky on this battery. I use a ProTek Prodigy 625 charger. I raced at OCRC for years and only bought my ProTek batteries from them only, except for this 6500, which I bought here from AMain Coincidence? I doubt it, but it sucks.

TL;DR: Just go with another brand like Gens Ace and also, don’t buy your batteries online unless you have to. And if you have to, buy them from a different website than this one. Don’t overpay to be left stranded with a tiny warranty window on an overpriced battery that was pour quality. Thanks.
Jose Gonzalez
Verified Owner
Friday, Jun 23 2023 (8 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I have gone through two of these batteries in approximately one year!

First battery I bought and didn’t use it for several months because I was waiting for my race friend to finish completing his eighth scale build. I never hooked it up to the charger I just left it in the box.

Finally got to go Racing I properly balance charge my Lipo and was only able to run a few races before the female negative bullet fell through down into the battery case.

Contacted Amain and explained everything. Because it was past three months the best they could do was offer a small discount towards a new battery.

I was a little disappointed but I bit the bullet and dropped another $100+ dollars.

New Lipo arrives I do a visual inspection everything seems fine. I go to charge the Lipo and right away I noticed that the balance plug was a little difficult to use but I was still able to connect. Ran this battery at my local track for approximately 3 to 4 club races and the battery has once again failed.

I contacted Amain and explained how the replacement Lipo is now having the same problem other customers have had, which is one cell in the Lipo will not read/not detected.

I explained how I am going through financial hardships due to being unemployed and asked if there was anything they could do to help. I was told that they would not warranty the battery and told me that they already helped me out with the first battery.

I would be lying if I said that I’m not disappointed. This hobby means the world to me, it’s the only thing helping me keep my sanity and now I can’t no longer partake and what brings me joy.

Who knows when I will be able to get back out to the track : (
Darryl Renaud
Monday, May 23 2022 (about a year ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I purchased two of these batteries and ended up having a small issue with one, i was concerned about the warranty as i live in Canada ?? I contacted customer service through the chat and was quickly answered by Brett N, he was great to deal with and got me fixed up in minutes! My hats off to you guys I will definitely be shopping at amainhobbies again.
Brent Jackson
Verified Owner
Monday, Dec 18 2023 (2 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
These lipo batteries are amazing. The High Voltage power provides so much power to all my cars. I have tried many different brands and these are by far the best.
stuart measures
Saturday, Aug 12 2023 (7 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
#3 cell dropped out to 1v. entire pack has exactly 11 charges on it and alway stored at maintenance charge. No way I will buy another protek battery