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EcoPower "Electron" 4S Li-Poly 35C Hard Case Battery Pack (14.8V/4100mAh) (ROAR Approved)

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This is an EcoPower "Electron" 4S, 4100mAh Li-Poly 35C Hard Case Battery Pack. Every hobby enthusiast is unique, each with their own specific needs and expectations. Not everyone needs a professional grade, high performance LiPo battery, while others simply don’t want to spend big bucks on the latest “flavor of the month”. The common thread between these customers is they both want a reliable and affordable battery that provides good runtime, good power and reliable performance, and is ready to deliver with EcoPower!

1/8 scale electric classes are gaining momentum, but the class is a niche market that is being held back by the cost of the equipment needed to operate. So EcoPower is here to help get more people into the class with a high quality 4S battery was developed specifically for 1/8 scale e-buggy applications! This provides enthusiasts with a great battery that allows you to save money and have more fun! This pack includes an integrated balance charge lead with a Deans style T-plug installed for a convenient connection capable of handling extremely high amp rates. While the 5-pin Align/E-Flite style XH balance connector provides compatibility with one of the most common varieties of balance tap connection. 

EcoPower batteries are tested in house, allowing us to provide batteries that deliver accurate specifications and reliable power, at a price that is geared towards our value conscious customers. Plus, if we say it’s in stock, you know we have it. And when you buy it, we will back it up with the outstanding customer service and support that you have come to expect from So stop beating yourself with cheap batteries, and buy from a trusted source that proves itself time after time with quality products at affordable prices! 

Note: Some vehicles may require some re-balancing if the light weight of these batteries cause some handling changes. To get the vehicle to balance correctly, add some weight to the battery side of the vehicle.



  • Type: Lithium Polymer
  • Capacity: 4100mAh
  • Voltage: 14.8V nominal
  • Connector Type: T-Style Ultra (12GA Wire)
  • Balancer Type: Align/E-Flite compatible (XH)
  • Number of Cells: 4
  • Weight: 436g
  • Dimensions (WxLxH): 48.25x140x39mm
  • Maximum Charge Rate: 2C (8.2A)
  • Maximum Continuous Discharge: 35C (143A)

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.

EcoPower is an brand

This product was added to our catalog on September 17, 2012.

Verified Owner
Good battery for about six months, one cell wouldn't take a charge until finally puffed the pack.
Verified Owner
Batteries were good till five months! The power leads detached itself from the cell rendering the fully charged lipo useless! one battery shorted out and catched on fire. My hooby king lipos outlast theses for much cheaper price. I will absolutely never buy ECO brand lipos again. Sorry A MAIN HOBBIES.
Matt Reinders
Verified Owner
I run these in my 8ight E 3.0 with a Tekin Gen 2 and a 1900kv motor, they have plenty of punch and can make well over 10 minutes. Couldn't be happier and can't beat the price!
Chris Chmielewski
Verified Owner
great batt for the price. good small package with a lot of punch. I think that the 35c rating is way off they feel like my 70c all day long
Verified Owner
Got 2 of these and could not be happier,long run times with a mod motor and way better than gens ace...
Vincent Zhang
Verified Owner
Excellent battery! I'm using this in my RC8.2e and it really doesn't feel like a 4100mah pack. I use Reedy Wolfpack saddles as well and these stack up at around half the price. It is also quite a light 4s pack (due to lower capacity) so if you do use a car with a layout similar to the RC8.2e you might notice a slight difference in handling. Perfect for the bashing enthusiasts out there - not sure how they would stack up for racers. superb battery especially for the price. Going to order more at a later date!
Thomas Challen
Verified Owner
Bought two of these to run in my RC8.2e and they charge and run fantastic for the price. I have a few $100+ Orion saddle packs and the quality of the product is really no different and for most 35c is plenty. I will definitely be buying more of these in the future and highly recommend them to others who don't need top echelon race spec lipo's.
john barbara
Verified Owner
Absolutely awesome! Dropped one of these in a rc8.2e and loving the weight equality!!!! No more heavy side. This buggy handles fantastic. I'm running a tekin rx8 and a tekin gen 2 1900kv motor and reporting 14 minute run times easy! This is the answer to the rc8.2e. The price is right too. Don't let the 35c rating scare you off they perform as good as anything else on the market. Save your money!!!!!!! Weight bias is everything. If your running 5000 mah packs your too heavy for this buggy. I'm weighing in at 7.8 lbs with this battery. Thanks
waylon glasscock
Verified Owner
this battery is absolutely terrible!!! we've all heard the term you get what you've paid for and its never been more true than in this case. i ran this battery with my mamba monster going at 60% power for about 20 minutes and the connections on the battery melted through causing both connections to stick together resulting in me having to un solder the connection from my esc. after fixing the problem i ran it again the next day to drain the battery. i then connected it to my balancing charger where i then found out the balancer was no longer working. i then tried charging without a balance and just received a low voltage message meaning the battery is completely dead and no its not user flaw i drove with a venom 3 cell for about a year with the same set up and its still kicking to my surprise unlike this eco. so if you drive a little car with absolutely no power in mind it might be ok but on an mbx6e with mamba monster 2 2200kv running only 60% power then you're wasting money. the only reason i bought this is because i first purchased the 6s but after tearing all the tires off the rim i realized it was WAY too much power so i took the chance buying the 4 cell thinking it'd be ok which was stupid of me because i never even drained the 6s its just too much power for bashing in my area. spend the extra $100 on something with some quality if you have a car with any amount of power that you plan on driving more than 20 minutes.
Richard Robbins
Great battery, running with a 2100 kv 1/8 motor I get no heat issues or puffing. Plenty of run time, I'm buying 2 more.
James Williams
Verified Owner
I've had mine a couple months now. It seems to be a pretty good battery. Despite being 4100mAh and 35C it has plenty of power to make a 7 minute race (I can make nearly 20 min during practice with a 1900kv motor) and more punch than you need. It fits under the body of my TLR 8ight-e 2.0 better than my other batteries (Gens Ace 5000mAh, Venom 5000mAh). I have switched to this almost exclusively because I like the way the car feels with the lighter battery. Weight wise its like putting a shorty pack in a 1/10 scale car compared to a full size. The only thing I don't care for, is the beige insert in the case (where the wires come out) doesn't like staying in place. It likes to pop out. It's not hard to put back, but I am thinking of Shoe Goo'ing it next time. But for the cost I haven't found a better battery for my 1/8 scale buggy.
walter hamilton
Verified Owner
i just recieved them in the mail today have not run them yet but from just looking at them they look like they are wel constructed and they fit in my rc8.2e
Michael Lastra
Verified Owner
Not a bad battery for the price. Unfortunately after 5 months of ownership and about 15 cycles through each battery, two of them have balance leads that seems to lose connection. Whenever i have them on the balancer, i need to wiggle the balance cable in order for them to function correctly and read the right cell voltage. They otherwise perform great and give my buggy more than enough power.
Verified Owner
I have two of these for rc8.2e, they perform perfect, surprisingly long run times, I won't buy anything else..... I used high-end brand 2s lipos for indoor 1/10 scale racing, after 8 months or so with light use, two batteries discharged very uneven and didn't balance well either, so after that I'm not sold on "you get what you pay for"
Michael G.
Verified Owner
Love 'em. Big bang for the buck. I'm used to running 100C and these pack alot of punch and easily last 5 minute qualifiers. Light weight and fit is perfect in MBX6e.
Jason Tuikka
Verified Owner
So far, 5 race days with no issues. I like the lighter weight, and the slightly smaller physical size in my Tekno RC8. Excellent power. Excellent price. I bought these after puffing two Gens Ace packs in one race day. If these last a season, I'll just buy fresh ones every spring. Thanks Amain! EDIT: Have a few more race days on these, and they're still working great. Still no issues. I am very surprised given the price.
I just bought two of these for my duratrax dxr8-e. Will have a better write-up after i put them thru the paces!

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