On Board Li Ion Battery Charger.

Here is how I added an on board li ion battery charger to my recently completed portable led floodlight.

https://www.instructables.com/id/My-Ultra-Efficient...

This Cv cc converter is ideal for charging Lithium batteries and my floodlight is powered by a Lithium 9v battery which is actually a 2s arrangement.

Step 1: Modding the Converter.

The converter has leds for Cv and cc modes. I replaced them with an external dual color led. Green for Cv or battery full. Red for cc or charging.

Also I put a blocking diode On the output to prevent the battery from being drained while the floodlight is stored.

Step 2: Setting the Cv Cc Converter.

Using my Handy bench power supply I gave the Cv Cc converter a voltage of 20v and set the Cv to 8.3v and the cc to 0.38amp. In each mode you can see pics of the dual color led coming on.

Step 3: Adding a Power Supply.

Using a spare netbook AC power supply, I drill 2 holes and fed the dc cable through one. I put a. Plastic cable tie onto the cable to prevent it from being yanked out. The power supply I attached using double sided tape.

Step 4: Wiring in the Cv Cc Converter.

I soldered the netbook dc cable to the input terminals. The output via the diode I wired directly to the battery. This way I can charge the unit whether it is on or off.

Liquid tape I applied to avoid faults when I bundle everything into the enclosure.

I did a quick test and with the battery full, the dual color led is green.

Step 5: Stuffing It All In.

I used double sided tape to stick the two Cv Cc converters in place. With a piece of foam and the reflective backing, I sealed up the floodlight.

Step 6: Wiring in the AC Chord.

I didn't want to risk losing the chord so I soldered it permanently. I applied liquid tape for insulation after.

Step 7: Completion.

I used a velcro strap to hold the AC chord onto the yoke handle. Also I put an adjustable shoulder strap for ease of use. The last pic shows the internal battery being charged after I did a load test on the unit.

Now my portable dimmable led floodlight is complete with an internal li ion battery charger!

The internal battery can be fully recharged in 90 minutes.

I hope fellow hobbyists have found this instructable useful!