Maximum current on non protected 18650's

[videoman]

On a 2100ma 18650, non protected cell, can I safely draw a constant 3 amps from it, or it may explode ? or that 2100ma rating on it is the max current to use ?
Also, if that same cell was a protected one, what would the upper current be to trip it ? Approx.

Thanks

[HKJ]

On a 2100ma 18650, non protected cell, can I safely draw a constant 3 amps from it, or it may explode ? or that 2100ma rating on it is the max current to use ?
Also, if that same cell was a protected one, what would the upper current be to trip it ? Approx.

That depends on the actual cell used, i.e. try searching for the datasheet. Today a 2100 mAh cell will often be a high current cell and be able to handle 10 ampere draw.
Protection limits are from about 30% to 100% above the rated maximum current on the batteries I have tested.

[jh333233]

That depends on the actual cell used, i.e. try searching for the datasheet. Today a 2100 mAh cell will often be a high current cell and be able to handle 10 ampere draw.
Protection limits are from about 30% to 100% above the rated maximum current on the batteries I have tested.

Who say so, unless its an IMR or maybe Lifepo4/Li-po, otherwise the cell gets heat up easily then fireworks come out
Not ALL Li-ion supports over-2C "continuous" current draw

[samgab]

As there has been no actual smoke or fire, this thread probably belongs one level up, just in "Flashlight Electronics - Batteries Included" rather than this topic area, FYI.

[jh333233]

2.1Ah 18650 cell can safely deliver 3A because its below "2 times Capacity" which is 4.2A
Lifepo4 and Li-Po have a larger max continuous discharge rate but im not sure about it
For IMR its 10C, which means it can be drained completely in 6 minutes without causing trouble

[HKJ]

Who say so, unless its an IMR or maybe Lifepo4/Li-po, otherwise the cell gets heat up easily then fireworks come out
Not ALL Li-ion supports over-2C "continuous" current draw

The last two LiCoO2 cell I have received both supported 10A current drain.
When designing a cell it can be made for high capacity (Today that is 2600, 2900, 3100 mAh) or high current (The lower capacities). For older cell design the capacity/current change will be at a lower capacity value.
But as I also wrote, search for a data sheet.

[Changchung]

Very good info here...

I just buy some panasonic 3100mAh protected, I wondering if exist different kind of quality of protected pcb?

If I drive 4 18650 protected in serie can this damage the pcb?

I just want to use this thread to find a answer because I think is almost the same thing...

Thanks

I forget, I just can find lifepo4 in 1000mha max, I am right or exist highest capacity for this batteries???


SFMI4UT

[yifu]

Generally, the maximum discharge rate for LiCoCl cells is 2C, double the cell's capacity in amp hours. For LiMn chemistries, this increases to around 10C or to 20C for LiFePo cells.

[jasonck08]

On a 2100ma 18650, non protected cell, can I safely draw a constant 3 amps from it, or it may explode ? or that 2100ma rating on it is the max current to use ?
Also, if that same cell was a protected one, what would the upper current be to trip it ? Approx.

Thanks

Almost all quality LiCoO2 cells will have a max disharge rate of 1.5-2C. Some newer "mid-current" cells that were released within the last year support currents up to 10A and have capacities in the 2000-2250mAh range. When in doubt consult the spec sheets.

The last two LiCoO2 cell I have received both supported 10A current drain.
When designing a cell it can be made for high capacity (Today that is 2600, 2900, 3100 mAh) or high current (The lower capacities). For older cell design the capacity/current change will be at a lower capacity value.
But as I also wrote, search for a data sheet.

10A cells are not going to be pure LiCoO2. All the ones I have seen have some Nickel and Manganese in them.