1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh) by ProTek RC

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This is the ProTek R/C 1S 550mAh, 25C Micro Helicopter Lithium Polymer battery pack. This pack is a direct fit for the Blade 120SR helicopter and will provide better performance and longer flight times!



  • Type: Lithium Polymer
  • Capacity: 550 mAh
  • Voltage: 3.7V nominal
  • Connector Type: JST
  • Number of Cells: 1
  • Weight: 15g
  • Dimensions: 7.5x19x60mm
  • Maximum Charge Rate: 1C (550mAh)
  • Maximum Continuous Discharge: 25C (13.75A)

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 flight 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 AMain Sports & Hobbies brand.

This product was added to our catalog on February 21, 2011

Travis Edmiston
Verified Owner
Sunday, Apr 3 2011 (about 7 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
Hi Everyone, I just thought I would write a review since no one else has. I bought these batteries about a month ago, I was like so many other people, I was tired of the poor performance of the stock eflite batteries only lasting 20 cycles or so. Well, what I've found is that these batteries have way more punch, run cooler, and after 20 cycles are still performing like new. That being said, here is what I do and don't do.

Never charge at more than 1c or .5 amp
Never drop these batteries, all these small lipo's are fragile
Never take the batteries down below 3.75V open circuit voltage
Never leave the batteries fully charged for more than a day
Always store batteries at 3.82V-3.86V

One more thing, I know a lot of people are not going to like this but, I only fly my blade 120 sr for 4.5 minutes. When I land and check the battery voltage it reads 3.77V-3.78V, so that's about as low as I take my batteries. So if you want to fly longer get more batteries, I have 8. I know a lot of people fly their's for 6 minutes but trust me they are damaging their batteries. I hope this review helps some of you out their who are having battery issues with this otherwise awesome helicopter. Thanks
Len McWilliams
Verified Owner
Tuesday, Nov 29 2011 (about 6 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
Perform well. The only problem is that the plastic caps have come off all of the 6 batteries I purchased. This makes it more difficult to remove the battery from the 120SR battery tray. I've attempted to use superglue to re-attach the caps.
Rodney Powell
Verified Owner
Monday, Oct 10 2011 (about 7 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
I bought two of these Protek batteries and plan on buying more !!
The run times for these packs compared to the E-flights is a LOT better !!
The only problem I've had is that the end caps will pull off if you're not carefull !
Make sure the connections inside the cap are ok then a very small dab of hot glue and you're back in business !!
Other than that these are great packs for your 120 SR !
I'd love to see Protek come out with a pack with even more capacity but I know weight would be a problem.
vaughn sabo
Verified Owner
Thursday, Apr 14 2016 (about 2 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
Just received these batteries today. Charged them up, and flew them in my blade 120SR. Worked flawlessly. They have great power and I flew for almost 9 minutes without the helicopter losing power. These batteries are the perfect replacement batteries instead of the stock eflite batteries that come with blade. I hope Amain hobbies orders more of these for their stock because I will order another 4 more just for spares. Excellent-Excellent batteries.
justin sherwood
Verified Owner
Saturday, Jul 27 2013 (about 5 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
excellent batteries fixes the lv cut off i was experiencing 120 sr, and crashes that follow, also get 3 to keep it in the air long enough to learn!...only run a 2-3 min, then swap out. you can fly a long time this way and not ruin your batts! hitting the lv cut off will ruin them...... ps with one batt good luck learning...
flying for 5 min till lv cut off then waiting an hr to charge, you forget what you were doing:( getting 3 batts run them half dead, they charge much quicker, and gives you the stick time, to have the ah ha! moment , i thought id never learn, first round of 3 batteries, i got the hang of flying around:) , i could not get past hovering with one batt good luck!
Glen Nardin
Verified Owner
Friday, Mar 23 2012 (about 6 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
I have flown 2 Blade SR 120 helicopters on these batteries. The one I'm using now is still my best battery of 5 different brands and, after checking the e-receipt for it, I bought 2 of these in April 2011! I lost one in a massive crash last Fall (which I forgot about the guarantee I should have used), but the one I have now is still from the original two I purchased... and it still out performs my other batteries.
Verified Owner
Saturday, Dec 10 2011 (about 6 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
i think even a little more power than hyperion 550
running in helimax brushless conversion mcp x
great battery
Russell Brown
Verified Owner
Sunday, Jun 26 2011 (about 7 years ago)
ProTek RC 1S High Power Blade 120SR Helicopter 25C LiPo Battery (3.7V/550mAh)
hi like to say these battery are great when i charger then up with my triton jr. the ma is 550 to 563ma the eflite battery only get 436ma to 445ma they never came up to 500ma. the proteck run for about 10 minute the eflight 5to 7 minute and i charge them at .5a.