Parts/Batteries & charging/LiPo batteries/ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh) (w/Balancer Plug)
ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh) (w/Balancer Plug)
ProTek RC

ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh) (w/Balancer Plug)

Part # PTK-51714.9(18)
Where to buy
$33.99
AMain Hobbies
Seen Oct 12, 2026
$33.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

This is a Li-Poly 2000mAh receiver battery pack from ProTek R/C, made with super thick 20awg silicone wire! This super light weight Li-Poly battery is designed to power the electronics of 1/10th & 1/8th scale gas powered race cars, and was designed specifically for the Losi 8ight family radio boxes! The overall weight of your race car will be significantly reduced over the use of typical NiMh receiver packs. The battery voltage to your receiver and servos will remain constant throughout the race with the use of a voltage regulator (required). A constant voltage for your servos will ensure consistent performance at the start and end of the your race compared to typical NiMH receiver battery packs.

These packs are built with a lexan plastic shell around the outside of the battery, and then covered in blue heat shrink. The lexan shell is designed to protect the battery cells while in the vehicle, for longer life. Note that due to the lexan shell, sometimes the battery may feel soft to the touch on the outside of the battery; this is normal as there is a small air gap between the lexan shell and the battery cells inside.

Runtime:
Don’t be thrown off by the capacity rating of Li-Poly battery packs, as you will get awesome runtime out this pack! Unlike NiMH battery packs, Li-Poly battery packs do not lose voltage as quickly over time and can handle higher current draw than typical NiMH battery packs. Given that Li-Poly battery packs provide a higher nominal voltage (7.4V nominal), the actual capacity of the battery pack when compared to a typical NiMH battery pack (6.0V nominal) is about 30% more than the rated value (so this pack would be about the same as a 2600mAh NiMH pack in total capacity). Also with the use of a voltage regulator, Li-Poly battery packs will produce the same voltage to your receiver and servos at the end of the pack as it does at the start. This means the useable capacity of the battery pack is significantly more than typical NiMH battery packs, because most NiMH battery packs will produce significantly less than the 6.0V nominal voltage once they get below half capacity (ie: your servos will be a lot more sluggish if your typical NiMH battery pack is below half capacity).

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Specifications:

  • Capacity: 2000 mAh
  • Case: Lexan shell covered with heat shrink
  • Weight: 82 grams (including wire and connector)
  • Li-Po cell arrangement: 2S2P
  • Nominal voltage: 7.4 Volts
  • Discharge capability: 8C continuous (16A), 16C max (32A)
  • Dimension (WxLxH): 39 x 55.5 x 20.17mm
  • Connector: JR Style with thick 20AWG Silicone Wire
  • Balancer Plug: ProTek R/C XH style (Align, E-Flite compatible)
  • Recommended Application: Losi 8ight vehicles, 1/10th & 1/8th scale vehicles, Helicopters and Airplanes 

IMPORTANT:
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.

CA Residents Prop 65 Warning WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Details...

Reviews4.9 · 18 reviews

Marco RodriguezVerified owneron ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh)

Awesome lipo receiver pack for my Losi 8IGHT 3.0 from Protek! Run time is amazing! Even after an hour long main not much drain on this battery and Im running HV servo's! Definitely recommended!

2 found this helpful
Phillip AtondoVerified owneron ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh)

I use this reciver pack in all my TLR 1/8 nitro cars and they work great with no failures witch is something I rely on to get me through those 45min mains!

2 found this helpful
Nick CattunaVerified owneron ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh)

Great Battery, fits perfectly in the Losi Eight 3.0 radio tray. Works perfect with no issues or puffing. I highly recommend this battery!!!

1 found this helpful
Bob VeitchVerified owneron ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh)

SO happy to find this battery! LOSI 8ight B and T owners rejoice! Will replace our old Losi packs which are not made anymore, as an added bonus, will also fit in for the Kyosho guys too! Just had to change connectors for the Losi, but no big whoops. An AWESOME find! Now, just need to be as happy to find a battery to fit my Ten-T, and Ten-SCT! Wish I could post pics, but oh well. Oh, and yes, most receivers can handle up to 9 volts input, so don't really need to run, or worry about any kind of regulator. Been running them like this for years.

1 found this helpful
Mark DiazVerified owneron ProTek RC LiPo HB & Losi 8IGHT Receiver Battery Pack (7.4V/2000mAh)

Fits perfect on my 8 T 3.0.. Will buy again for my Buggy...

1 found this helpful
What reviewers say

Reviewers overwhelmingly rate this 7.4V 2000mAh LiPo receiver pack highly, with most praising its fit in Losi 8IGHT radio trays (including 2.0 and 3.0 versions) and its long run time with high-voltage servos. Several reviewers note it fits better than the Losi RX pack, and some say it works with flat box covers, though one reports a tight fit that scuffs the battery top. One reviewer reports cells dropping below 1V after being left connected for a weekend, recovering when unplugged and stored; another reports a battery killed by over-discharge from running too long, which the reviewer attributes to their own handling. Some reviewers mention needing to swap connectors for Losi plugs. One question asks about fit in the 8IGHT X, which is unanswered. Most reviews are from verified owners.

  • + Fits Losi 8IGHT radio trays well
  • + Long run time with HV servos
  • + Good build quality
  • + Fits better than Losi RX pack
  • − Tight fit; cover may scuff battery
  • − Over-discharge risk if left connected or run too long
  • − Connector change needed for Losi plugs
Summary generated from the reviews above.

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