I highly recommend WindyFire 14500’s. They come in both Flat Top & Button Top configuration. Priced at $2.99 at MTN Electronics.

It says 600 mAh, but all of mine have measured a bit over 650 mAh. They were tested for discharge capacity on both my Lii 500 & Opus. The measured capacities from the Opus were corrected for the known issue that the Opus discharge capacity measurements are high.

These are great cells. Priced right. Highly recommended!! :+1:
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Unprotected, flat top or button top. This is one of the best “high drain” 14500 cells available, outperforming even the venerable AW and Efest 14500 cells—check out the discharge comparison picture!

Read HKJ’s review of the cell.

Diameter:14mm
Height: 49.1mm

Manufacturer Cell Specifications:

  • Nominal Capacity: 650mAh (0.2C discharge)
  • Charging Termination Voltage: 4.2v
  • Maximum Continuous Discharge: 6.5A
  • Maximum Pulse Discharge: 9.75A
  • Recommended Charge Current: 0.5A or 0.25A
  • Maximum Charge Current: 1A
  • Recommended Discharge Termination: 3v

These cells, like all lithium and IMR cells, should not be discharged below 2.5 volts.
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The VapCell 14500 - 1000mAh, mentioned above by BSM ; are fairly close to the WindyFires up to 2A discharge & of course have more capacity. But at 3A discharge the separation begins in all but capacity. At 5A discharge the Vapcell falls on it’s face. At 7A discharge it is dying. It sells for $3.50 at Illumn.

In fact, up to 1A discharge the VapCell slightly beats the WindyFire.
At 1A discharge they are about equal.

So, up to 3A discharge if you want or need the greater capacity; the VapCell is a good compromise I think.
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This is a good 14500 too, it is just barely better than the WindyFire. It costs $4.25 at MTN Electronics.