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

ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
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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 547 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. 

When compared to standard LiPo and LiHV, Silicon Graphene cells deliver improved efficiency, lower operating temperatures, lower internal resistance, better run time, increased cycle life and increased voltage - but Graphene + 120C LiPo batteries take that a step further with more power and lower internal resistance when compared to the previous ProTek LiHV Graphene packs!

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.

NOTE: This battery is not recommended for high current draw 8S applications. 


  • Lighter than a hardcase 4S LiPo pack of equal capacity
  • Improved power to weight ratio and a lower overall CG
  • 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
  • Improved efficiency, lower operating temperatures, and lower internal resistance!
  • Increased run time, increased cycle life and increased voltage!
  • More capacity gram for gram when compared to standard LiPo cells
  • Perfect for stock class racers looking to shave grams
  • 10C max charge rates - 1C charge rate recommended for longest life
  • 15.2V nominal voltage
  • 5mm bullets and 5mm to 4mm bullet adapters included
  • Replacement XH4S balance adapter also available separately (PTK-5331)
NOTE: While these batteries are LiHV cells, they can still be charged the same as a standard LiPo with a standard LiPo charger. The overall voltage and capacity will be slightly less than when charged to LiHV specs, but the performance will be better than a standard LiPo thanks to the flat discharge curve, reduced weight and low internal resistance. When charged to 8.4V, these packs will still offer a noticeable advantage when compared to a standard 7.4V LiPo pack.

Battery Model 4S HV LiPo
ROAR Approved Yes
Type Silicon Graphene 
Voltage 15.2V nominal
Capacity @7.4V
Capacity @7.6V
547 g
Connector Type
5mm Bullet
Balance Connector
5 pin XH
Number of Cells 4 Cell
Configuration 4S2P
Dimensions (WxLxH) 47x139x48.2mm
Maximum Charge Rate 10C (65A)
Burst Current
Watt Hour @7.6V
98.8 Wh



  • (1) ProTek R/C LiPo Battery
  • (2) 5mm Bullet Connectors
  • (2) 5mm to 4mm Reducer Bullet Connectors
  • (1) 4S Balance Lead


1) DO NOT leave the battery in your model when charging
2) DO NOT leave unattended when charging
3) ALWAYS balance charge the battery
4) ALWAYS use a LiPo charging bag
5) YOU MUST use a Li-Poly specific charger to charge the pack (NiMH or NiCD only chargers WILL NOT WORK!)
6) YOU MUST not over discharge the Li-Poly battery pack
7) 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 over heated 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 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 the battery that has too low a voltage.

Do not expose batteries to sunshine or store/charge batteries at the temperature 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 the battery until it has cooled completely. Wait about 20 mins, then inspect prior to recharging.

Verified Owner
Friday, Apr 24 2020 (10 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I purchased this LIPO and received a defective battery. I've contacted Amain Customer support, provided videos and pictures describing the problems (had to send twice) and still have no idea if a replacement is on the way, if a refund is being issued. I'm very frustrated with customer support and Amain at this point after having spent thousands of dollars with them. I expect better customer service.
Verified Owner
Tuesday, Jun 23 2020 (8 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
This is my third one warrantied two of them brand new out of the box one had a bad cell a lot of aggravation with this battery can you guys did nothing to make it right hip send me two more batteries one was no good and this one I haven't tried yet I thought maybe I'll get some store credit for all the problems but that's okay
Monday, May 18 2020 (9 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
This is the 5th protek battery i have had fail from the lugs. I have a 2s shorty 0 power at lugs, and 3 6500 graphines before this one that I lost the bottom cell from the solder breaking below the lug. this design is terrible and 100% unreliable. Do NOT buy these and do not get suckered into a discount on another one. I bought these October 2019, ran 3 weekends and one weekend this year as we don't race in winter, passing the 90 day warranty even with 30 days of use. Finally had to just accept these are a money hole to try and keep using them.

Update, the issue is they rely on .2mm of copper foil to transfer the entore current from battery. Pictures on rc tech

UPDATE - after seeing the picture of the foil area they replaced the battery, ty A-main for standing behind this one
Verified Owner
Saturday, Jan 30 2021 (4 weeks ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I gotta be honest these batteries an the service I'm receiving are leaving a bad taste in my mouth this is the 3rd battery I've gotten that was bad no good period don't buy this trash an its taking Amaine a month to get me my batteries back step it up people.
Verified Owner
Saturday, Jan 23 2021 (5 weeks ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Very nice battery, good Voltage, you cannot go wrong with ProTek. I recommend it.
Verified Owner
Thursday, Jul 9 2020 (8 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Probably the most wanted and most liked battery out. Most effective when using bullet connectors.
Verified Owner
Monday, May 25 2020 (9 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Great battery with leading technology. Great service too!
Verified Owner
Monday, May 18 2020 (9 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Awesome battery last forever comes with connector just need your favorite connector and your good to go. Battery is super light compared to other battery and has plenty of power for my application. Customer service is the best I will continue to shop here and hopefully
Get another battery I love these.
Verified Owner
Friday, Apr 17 2020 (10 months ago)
ProTek RC 4S 120C Low IR Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Great battery. Super low ir and tons of power and run time. As always great customer service at Amain