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Samsung INR21700-33J 3270mAh - 6.4A

Additional Information

EAN / GTIN  7417940526782
Weight - g  63
Brand  Samsung
Model  INR21700-33J
Size  21700
Battery chemistry  Li-ion
Battery  Rechargeable
Voltage  3.6V
Min. capacity - mAh 3,200.00
Typ. capacity - mAh 3,270.00
Battery version  Flat top
Discharge current - A 6.40
Circuit protection  Unprotected
Height - mm 70.15
Diameter - mm 21.10

Availability: In stock

  • Buy 390 times for €1.19   

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Minumum capacity: 3270mAh
Typical energy: 12.0Wh
Minimum energy: 11.4Wh
Standard charge current: 1.6A (0.5C)
Maximum charge current: 3.2A (1C)
Charge cut-off current: 64mA (0.02C)
Charge end voltage: 4.20V
Recommended charge end voltage: 4.10V / 160mA cut-off
Max. continuous discharge current: 6.4A (2C)
Discharge cut-off voltage: 3.0V
AC impedance at 1KHz: 29±5mΩ
Weight: 62±1.5g

Additional Information




Customer Reviews

for the price they are good Review by sid
testec capacity 1 cell 2800mAH second 3300mAh

ordered 130 pieces.

spotwelded 20 yet. i have aliexpres spotwelder connected to car battery and just touching + pole on the battery with wire.
nickel strips holds but can be easily removed. but for stationary use it is ok. i am welding 8 dots to each pole of the battery to be sure it holds.

i was unable to solder a wire directly to the top of the battery.
satisfied for the price (Posted on 22-05-23)
perfect for powerbank. Review by roger
ordered a couple of powerbank cases from china for 8 21700 cells, a case is between 8 and 15 euros.
put 8 of these in them and works perfectly.

real 25k powerbank that can do 12v as well for under 25 euros that actually has cells in it that i know are new and from a reputable brand, and not some crappy chinese ones.

can't beat that i think.

when removing the tags sometimes it leaves little high points from the welding, but these are easilly removed.

very happy (Posted on 06-01-23)
It is possible! Review by Tabasco
Just like Artjom, I wanted to try if spotwelding is possible on these cells for decent battery storage. Can't wait till we begin to see the LFP batteries outside... In the meantime, I wanted to limit the money flow towards... and go with this NCM cell.

It is possible to spot-weld these batteries enough for a fixed battery storage if you have a decent spotwelder and play a little with setup. They do not hold if if pull very hard, but good enough for my use at least.

I used 0.15mm pure nickel(I think). (Posted on 07-10-22)
Best bang for your buck Review by BarNiy
They can be spot welded using 0.1mm nickel plated steel. I'm using a "Schmidt-Instrumente UIP-1000" with 1.3 ms / 500 W ~ for the positive aluminium capped side and 0.4 ms / 250 W for the negative side. (Posted on 02-07-22)

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Take care

  • Li-ion batteries can be dangerous when used wrong, short circuit or wrong usage can lead to fire or an explosion
  • Do not put the battery in a charger or equipment with wrong terminals connected
  • Never short cut the battery. Take care you don’t short cut it accidentally, do not put it in your pocked together with bunch of keys
  • Do not disassemble or deform the battery. Dispose it if the battery is deformed
  • Do not immerse in water
  • Avoid excessive physical shock or vibration
  • Do not expose to, dispose of the battery in fire
  • Keep out of the reach of children
  • Never use a modified or damaged charger
  • Do not leave battery in charger over 12 hours
  • Store the battery in a cool, dry and well-ventilated area
  • Dispose of in accordance with local regulations
  • Do not solder on these cells