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

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
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Low Price: $174.99
Discontinued Online

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.


  • 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
  • 7.6V 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.

This product was added to our catalog on December 18, 2018

Verified Owner
Friday, Feb 7 2020 (2 weeks ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
I bought a few of these batteries to run in my kraton 8s and I’m real impressed, great punch, and run time. The extra voltage also increases top speed and battery capacity.
Verified Owner
Monday, Dec 30 2019 (8 weeks ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Bought 2 of these batteries , at 4 months one swelled up beyond safe use. Same week the other lost cell 1 . Had others at local track have same problems . Would not recommend , for the price and lack of a longer warranty .
Verified Owner
Sunday, Dec 15 2019 (2 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Spencer Rivkin put me on this battery for my RC8B3.1E and this battery has POWER on Power and last a long azz time. just OMG
Verified Owner
Thursday, Oct 31 2019 (4 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
These are great as they weigh about the same as a normal 5600 pack and I assume if you charge to regular no HV limits they should last a long time. I have 4 older versions (not the "plus") that I have been using and 2 are like new 2 others had the internal post area break causing one to run on 3 cells and was ruined quickly another one broke as well but was fixable. I added a heavy copper wire along the solder sides as both had a gap in the same area.

Hopefully these have much better manufacturing than the last ones, so far so good but a bit pricey
Verified Owner
Thursday, Oct 17 2019 (4 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Best lipos I’ve ever ran in ebuggy- insane punch , low ir , and light weight!
Verified Owner
Sunday, Sep 1 2019 (6 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Big bad A** battery that I use in my ebuggy. Handles a couple qualifiers and mains back to back no problem. little expensive. Make sure you have a good coupon. Would buy again.

For the guy below who says the bullets are a little too tight and hard to pull out. Squeeze them with some plies until they get to how you like them.
Verified Owner
Sunday, Jul 28 2019 (7 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
This battery is amazing. I do not want to go back to conventional lipos after using this. I can verify and confirm that the voltage stays more linear under load compared to regular lipos. On a dual 2s setup on my mugen mbx7t eco, my maxxamps batteries trip the voltage sensor on my 7px at 15volts while under load, the alarm is programmed to go off at 12.8. However the protek lihv battery doesn't trip the alarm until it reaches around 13.8 under load on my newer mt410 build. That alarm is also set to go off at 12.8. This will be my go to battery in the future. I just hope it lasts as long as my maxxamp batteries.
Verified Owner
Sunday, Jul 14 2019 (7 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Great product and awesome customer service. Warranty procedure was simple and product was shipped fast.
Verified Owner
Wednesday, Jul 10 2019 (7 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
Only one outting on this battery but i can run my tekno eb48.4 for 20 plus min on a full charge!!!! The bullet connectors are super tight. Needs a eazy way to pull the bullets conectors out. The battery seems to be well made and hope it last longer then the 90 day warranty. Like horizon hobby “reaction” batteries, they have a full year warranty. I’d like to see protek have a bit better warranty.
Verified Owner
Tuesday, Jul 2 2019 (8 months ago)
ProTek RC 4S 120C Si-Graphene + HV LiPo Battery (15.2V/6500mAh)
These batteries are great. Work amazing for my mbx8 eco and tlr 3.0.