Samsung INR18650-25R



This was one of the best 18650 cells ever made. It handles high current loads well (a max. continuous discharge of 20A) and has a good capacity of 2500mAh. As such, this has become a go-to cell for many industries. This cell is now known as the 25R2 (blue) to distinguish it from a newer version of itself, the 25R5 (green) which came out in early 2015.

The 25R is now completely replaced by the green 25R5.

Battery specifications:

  • Max. continuous discharge current: 20A
  • Safe pulse discharge ratings: 95A < 0.5 sec, 65A < 1 sec, 40A < 5 sec, 30A < 6 sec
  • Nominal capacity: 2500 mAh
  • Nominal voltage: 3.6 V
  • Discharge end voltage: 2.5 V
  • Charging voltage: 4.20 +/- 0.05 V
  • Standard charging current: 1.25 A
  • Length: 65.85 mm
  • Diameter: 18.33 mm
  • Weight: 45.0 g

Battery Bro has your back

Never worry about quality when buying from Battery Bro. We make sure you have the latest, greatest cutting-edge batteries, every time. 


18650 batteries are commodity cells, and as a wholesaler we understand how important price is to your bottom-line. As such, we offer international shipping directly from Asia to save money at higher quantities.


Shipping is 100% free in the continental US when shipped from our California warehouse. You pay what you see above and nothing more. Simple as that.

  • We ship worldwide! Learn more about our new PostNord shipping option for low quantity orders offered direct from our Asia warehouse.

With Battery Bro, we take care of customs clearance, international or domestic shipping to your door.

21-day full refund

Full 21-day refund on all orders. Buy our products, and if you're not satisfied, you get your money back.

Quality guarantee

Battery Bro takes several measures to make sure your batteries are of the highest quality:

  • We only deal with manufacturers or authorized distributors.
  • We inspect every battery and do our own testing.
  • We track each battery case with a unique authenticity code.

In Asia, 18650 batteries are binned by quality into A, B, and lower bins. C-bin batteries are often recycled from battery packs. Lower bin batteries will underperform and may be dangerous.

Battery Bro guarantees that all our batteries are Grade A. 

Download the official Data Sheets:

Introduction of INR18650-25R

INR18650-25R Cell Specifications

Blog post(s) about the 25R:

Amazing Batteries Part 2: Samsung 25R

Want to sell even more batteries? Upgrade to the Samsung 25R deluxe pack.


Take a look at our 18650 battery safety infographic

Some general tips

  • Do not exceed max. continuous discharge ratings.
  • Keep temperature under 60 degrees Celsius.
  • Do not carry loose batteries in your pocket.

Free Safety Booklets

For retailers selling 18650 batteries: 

18650 safety booklet

Increase battery sales and protect yourself from liability with 18650 safety booklets.

Customers ignorant to battery safety are not likely to purchase 18650 batteries or upgrade to MODs which require them.

You, the store owner can show your customers your shop cares about their safety

Simply bundle our safety booklets with the batteries you sell.

  • Did you know? In 2015, an e-cig shop was sued for one million dollars when a battery short-circuited in a customer's pocket. A safety booklet could have prevented that and protected the retailer from a lawsuit.

    Get 50 free booklets on your first purchase of 20 cells or more.

    Visit the battery booklet product page.