How to integrate a charging circuit

Flashlight Modding and DIY Parts
1

Is there a way to combine the charging circuit from one driver with a new driver? Like the driver from a bd06 combined with an fet+1 driver?

Or

Is ther a small charging circuit out there that I could implement into a light? Maybe I could take apart a one bay xtar charger and use the circuit? If I had to I could move some components around to make the circuit smaller.

Has anyone thought of this or even maybe tried it?

2

For simple charge circuits it is nearly always a TP4056 that is used.

http://lygte-info.dk/review/Review%20Charger%20TP4056%20UK.html

3

I wonder if I could learn to make a round oshpark board and then transfers the components from this circuit?

Do you know the length and width of that board?

4

I do not have one handy, but a seller on ebay says: 25X19X10mm.

5

Ok. It looks I could manipulate the board if there a light with some space. Now, if I connected this circuit to the battery with the driver connected as well, do I need some components to protect the led from the reverse charge? I guess this is probably a hard question to answer as each driver works differently. Some regulating on the high side and some on the low side.
I think I will order one of those circuits and play with it. Probably the best way to get my questions answered :slight_smile:

6

This is for single cell only and there is no risk of any reverse charging.

7

> to protect the led from the reverse charge?
The LED will just do nothing if you put the battery in backwards.
But other components on the driver board may fail, unless the driver has protection against reversing the battery

8

Will the TP4056 based charger have parasitic drain on the cell when not being powered?

Edit: draws less than 1uA from the battery per HJK’s above linked review.

9

I think it would be possible to take of the components and reflow them onto a custom board. There’s not much there… Should fit on 16mm board? This would open up the door to mod some lights with charging circuits and low output. I could always add my preferred driver and ignore the charging input, but if there’s aport there seems it should be used. Just my opinion though.

10

You could use an external charging circuit or re-purpose the port for external power or a remote switch.

11

Hmmm… I hadn’t thought of keeping the charging circuit outside the light. Then it could use a dedicated charger specifically for the light. This may be helpful.