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ProTek R/C Li-Poly Losi 8ight Receiver Battery Pack (7.4V/2000mAh) (w/Balancer Plug)

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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.

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).

Why must Li-Poly receiver packs be used with a voltage regulator?
Although the Li-Poly battery pack’s nominal voltage is 7.4V, when it is fully charged the voltage output is 8.4V. The 8.4V output exceeds the safety level of most receivers and servos on the market, so if you are not using High Voltage servos, you must use a voltage regulator with these Li-Poly receiver packs to decrease the voltage to safe levels that your receiver and servos can accept.



  • 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 

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.

ProTek R/C is an brand.

This product was added to our catalog on November 16, 2010.

Brett Redd
Verified Owner
This is a great battery. I ran through about 12 tanks through my 8ight-T after a full charge and and it still had about 500 mah's left. Ran it unregulated with HV servos and performance was great. Used the flat cover for the battery box and was able to get it closed, but the fit is tight and the cover scuffs the top of the battery.
David Nebout
Verified Owner
This battery fits the Losi Eights much better than the actual Losi Rx LiPo packs. On top of that, if you grind on the bottom of the case a bit and remove the pad, you can use the flat RX cover. Ran a 20 minute main and a 5 minute warm with hitec HV servos and used 320 mAh. So far so good. I din't give it 5 stars because I've only charged it 4 times and don't have the best info on it yet.
Brian Rock
Verified Owner
Pack fits great in our JQ white edition battery box. Very good run time, and balances out just fine.
Mahpot Sham shol aripen bin
Verified Owner
Bought two of these. Fit perfectly to Losi 8ight 3.0 using flat cover provided.
Daniel Bell
Verified Owner
Top battery. Fits 'snug' but well. Highly recomended as first lipo upgrade. You won't be disappointed.
John Cortes
Verified Owner
Fits the Losi box well and lasts FOREVER even with HV servos. Probably a full hour of runnning before I even worry about it, and its usually got lots of jiuce left.
Jim Shreve
Verified Owner
This is an excellent receiver pack for the Losi 8ight 2.0. Fits perfectly with the flat receiver box lid. The capacity is excellent as well! Just be sure to organize the wires inside of the box when you insert the battery. There is plenty of clearance.
Nathan Gerdes
Verified Owner
Fits good in the gen III 2.0 tray. Plenty of power to run the hitec 7950 High-Voltage servo .
Joseph Jordan
Verified Owner
Fits better than the Losi Rx pack, performed wonderfully, ordering a 2nd one soon.
Mohd Zailani Dolkefflee
Verified Owner
Very good quality pack.Fit perfectly in losi 8ight box with flat cover.Awesome runtime
Phillip Atondo
Verified Owner
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!

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