Preface

LiionWholesale sent a couple of their new cells for some testing. This is the new Samsung 50e, a 21700 li-ion cell. It’s rated for 10A continuous discharge. Read on for performance graphs!

As always, click for bigger images!!!

Manufacturer part number: INR21700-50E

Size: 21700

Approximate Diameter: 20.25mm

Approximate Length: 70.8mm

Brand: Samsung

Manufacturer Rated Capacity: 5000mAh

Manufacturer Rated Standard Discharge Capacity: 4900mAh

Manufacturer Rated Max Continuous Discharge Current: 10A

Manufacturer Rated Max Discharge Current (not continuous): 15A

Nominal Voltage: 3.6V

Peak Voltage: 4.2V

Protected: NO, UNPROTECTED

Style: Flat Top

Color: Blue

Origin: South Korea

And here’s a spec sheet from Samsung themselves.

Price

You can buy the Samsung INR21700-50E at LiionWholesale. They’re $10.99 each at the time of this review, and volume discounts are available!

Short Review

These are good high capacity, low drain 21700 cells.

Long Review

Package

These cells ship in individual cardboard boxes.

But they ship with a plastic 2-up carrying case.

The case is specific for 21700 sized cells, and fits them perfectly.

Build Quality

Not a ton to say about the build quality of these cells, except that it’s exactly like it should be. The wrapper is perfectly centered and there are no bulges on the ends. Just right.

The wrapper is blue, and there’s a little white rim around the positive terminal.

The positive terminal is a 3-prong design.

Size

The width is 20.25mm and the length is 70.8mm.

Much bigger than an 18650 (GA, seen below).

Testing

I’ve tried to keep the scales similar, so over time the charts will be generally comparable.

Discharge tests

Capacity

Energy

Bounce

This is a new section, and I added it just because I think it’s interesting. “Bounce back” is what the cell voltage does when the cell rests after a discharge. Interestingly, after heavy discharge rates, the cell bounces back higher. This corresponds to a discharge amount of less energy, and does mean that there’s energy left in the cell. So if I selected the cell with the highest bounce back (ie the cell that was discharged at the highest current), then discharged it to 2.8V at 0.2A, I’d still find that there was a lot of energy still in the cell.

Charge test

Power, Constant

Internal Resistance

Conclusion

I think this is a very good cell. It’s only rated to 10A, but in my 10A test during which I logged temperature, the cell just barely even got warm. I think it could handle more (but I don’t think you should buy this cell for handling more). I think you should buy this cell knowing that it can handle the rated 10A easily!

Buy the Samsung INR18650-50E at LiionWholesale!

Up Next

I hope to finish an Astrolux for tomorrow, and I have a Fun Fund Friday coming up again!

Notes

These cells were provided by liionwholesale.com for review. I was not paid to write this review.

This content originally appeared at zeroair.wordpress.com. Please visit there for the best experience!

Whether or not I have a coupon for these cells, I do have a bunch of coupons!! Have a look at my spreadsheet for those coupons. It’s possible to subscribe and get notifications when the sheet is edited!!