unprotected li-ion w/ buck safe??

[Huz]

I will modify my question: Is 10280 safe with buck converter that needs 2.5v minimum input and outputs 400mah. 400X2.2/3.6= 244mah

That means <2C.

http://focus.ti.com/docs/prod/folders/print/tps62225.html

____________________________
ignore this:
I want to use 10280 to DD XPE red LED which is rated at 2.1V@350mah and 2.3V@700 mah. I remember reading that for such a small cell high discharge rate is ok because battery have only 180mah capacity and runtime of about 15min and will be used sparingly. I want to confirm this. Will I be destroying the the batteries?


Alternatly, I need a tiny li-ion overdischarge protection for 10180, it should be no bigger then 10-11mm diameter. is it possible to hack protected 10440?? what are my options?

 

[AW]

Re: need tiny li-ion overdischarge protection

The smallest available single cell LiIon protection pcb is 4mm x 8.75mm but it takes good skills to connect the 4 contacts.

 

[yellow]

where did You read that a high (EXTREME for that cell) discharge current is safer when the cell is small?
that will be 4*C!!!!

without undervoltage protection any cell will be discharged too much down with the 1st use and thus be damaged,
without overcurrent protection, You might also encounter safety problems.

 

[Huz]

Re: unprotected 10280 safe??

I dont have that thread bookmarked. I may possible be mistaken.

My options are 10180 with pcb OR protected 10440. Can someone weigh both of this, I may go with the larger one if it gives me significantly better energy density but that will come at the cost of a longer/heavier light. I am planning to mod either led lenser K3 or P3.

thanks!

 

[Huz]

Re: unprotected 10280 safe??

I have decided to go with protected 10440.

 

[Huz]

Re: unprotected 10280 safe??

I will modify my question: Is 10280 safe with buck converter that needs 2.5v minimum input and outputs 400mah. 400X2.2/3.6= 244mah

That means <2C.

http://focus.ti.com/docs/prod/folders/print/tps62225.html

 

[Huz]

Re: unprotected 10280 safe??

Modified the title/question.