7.4v 18650 Battery Pack NiMH

Remove resistor and connect to battery circuit directly. 3600 mIlliamp batteries or higher (9000). Internal batterypack opened with screwdriver reveals x6 18650 2300mAh batteries in series. With this schematic better batteries can be used breathe live into your old mobile dvd player😉

7.4V is for 2cells already. You have added 2x2xpairs which eliminate, equalize each other. So four cell are as not available.

check this http://everycircuit.com/circuit/4746289787699200

6 * 3.7V is good for 22V

Old(or new) laptop battery packs are a much more abundant supply for 18650s. However, harvesting them is usually slightly more difficult than simply removing a few screws. There are typically 6 per pack, but I've got 12 from an old Apple laptop before. Occasionally packs have high drain cells in them. (-:

Reading the description again I see that it never said anything about removing screws lol. (-:

if the cells are from an old device they are most probably 3p2s to have 7.4V

Your link shows some of the things I was trying to work out. I wanted to use the 18650 with higher mAh to get better battery life, but the program is giving me a little trouble putting batteries in series then parallel. Version 2.0 fixed the cell problem @hurz. All cells now available. I did in fact have to remove screws from the external, detatchable battery pack to get to the corroded cells, and didn't know the spec for the individual batteries I found inside. I had to invent one to create 7.4 volts from something so I chose 18650's. Seems silly now that I solved it, but this is a good tool and I'm still getting used to the app interface. Thanks for the feedback😎

old cells might have a high internal resistance 150mOhm or 0.15Ω ot even higher. You can extend to model of your cells by adding the resistance which the lets you put them in parallel if they are good balanced with a charger. So you can simulate 3p2s (3 cells parallel 2 series) Check this http://everycircuit.com/circuit/6139026885836800

Very cool, thank you. I think if I get x6 1.2v cells and put them all in Series this may fix the 3p2s problem also. Used a 3.2ohm resistor to allow 2.25 amps to pass such is the current requirement for the device according to the sticker. Rev3.0

1.2V is a different chemistry and would be closest NiMH which is not what you have with 3.7 it looks like Litihum polymer or Ion

Your right, I am working out an upgrade...