These used Samsung 18650 lithium ion batteries were pulled from laptops and other low-drain devices. They are rated at 2800mAh, with a voltage range of 2.75 - 4.3v*. All of these cells have a capacity above 75%.
NOTE: We are only able to charge to 4.20v. Testing on similar cells higher-voltage cells has shown that the difference in capacity between 4.25v and 4.35v is approximately 10%. Our capacity percentage numbers reflect this.
These are used cells. They were charged to 4.2v, left to sit for at least one week, then discharge tested at 500mA. We may wrap cells in new heat shrink if the original wrapping was significantly damaged. These may still be delivered with adhesive or tape still attached, or damaged heat shrink. Check out or selection of pre-cut heat shrink and adhesive rings to customize your build.
Lithium batteries can only be shipped ground. We ship our lithium batteries in accordance with all US laws. Batteries are not eligible for free shipping.
*Our charger/testers have a range of 2.8 - 4.2v; we find that manufacturers often specify a greater range (2.5 - 4.35v, for example), especially on higher-capacity cells. We make slight adjustments for 'effective capacity' to account for this. Capacity is written on each cell.