100% recycled li-ion and li-po battery charger

I'm gonna show you how, with a solder iron and some electrical tape and two hours, I turned two defunct electronic toys into full function, high end lithium ion battery chargers!

Try not to notice too much of the blur :-(
Both my real cameras are out on loan, so this was done with harsh technique.
a palm treo650, and a hand held magnifying glass.
Sorry.

When I get more "scrap" bluetooths and cameras, and have my multi-mega-pixel back... I'll add some clearer pictures. I promise. If you remind me :-)

Step 1: Bluetooth Headset to Li-ion charger

How you disassemble your bluetooth headset will depend on your model.
I used a Jabra that would drop phone connections at random intervals(VERY annoying).
My Jabra 150 is almost identical to the Jabra 350.

Comments

[zack247]

i do have a battery from a murdered ipod... ( i didn't kill it some truck drivers did, i guess they didn't see it dropped on the floor of the shop) the battery is still okay though

[ironsmiter]

As far as I know, the ipods use a LiPo battery almost identical in construction to the average bluetooth(only bigger). Cellphone batteries are slightly better because of the built-in low/high voltage cutoff circuitry, but you SHOULD be ok wit the bare LiPo cell. Obviously of note, it's going to take a lot longer to recharge. My bluetooth LiPo cell is 90mAh, your iPod battery is probably at least 500mAh, so charge times may pass from the hours, into the days range. An advantage with the lower current charging though... you don't have to worry about your battery getting hot :-)

[buckchuck27]

throwing this one out there, ive used some old cell phone batteries to power my xbox 360 controller.  i was sick of the AA batteries dying what seemed like every week.  so far one charge lasts a VERY long time.

[ironsmiter]

cool.

The OEM battery I saw when searching is 3600mAh @2.4v

Li-ion sits at 3.7(4.2v) and shouldn't be discharged below 3Volt(for safety)

It'll probably be just fine, but the controller WILL operate well below the safety voltage for the cell battery. Just remember to recharge it every once in a while, to prevent over-discharge(aka undervoltage).

I lucked out with my latest project...Cordless mouse/keyboard.
they both run on 3 AA batteries... and stop working at 3.1 volt... Perfect for swapping in Li-ion cells. The low-voltage cutout tells me that the circuitry was probably designed for Li-ion. UNfortunately, they're "generic" and the chips inside were no help identifying the manufacturer. Guess I get what I paid for(free from the electronics recycler drop-off).

[matse9999]

try using a mobile phone battery, just now i am trying it. my bluetooth has already a built-in LED flash light. now i am charging it and monitoring the voltage and temp. i think 4.2vdc when the battery is full. hope the LED turns to green or else BBOOOOMMMM.. hehehe..

[ironsmiter]

oh, and yes, 4.2 should be "FULL". To be safe, I'd charge only to 4.1 volt. The disadvantage is you only get 90% charge, however, it prolongs battery service life. It's also safer, incase your readings aren't within the +/- .05V cutoff called for.

[ironsmiter]

hehe, I'd do the charging outside, on a flame-proof surface... if that's your gig. It may be a "FUN" charge. Based on the info I have, you should be safe, as long as the cell phone battery capacity exceeds the bluetooth battery capacity. All the charging circuits I've tried have automatic cut-offs for overvoltage... and since they supply the exact same charging current. But as always, plan for and expect the BOOM, and be pleasantly suprised when it doesn't.

[matse9999]

good news.. the battery is working good! better than the original battery. though the charging time takes about 4-5hrs. next project will be my psp! using BP-4L 1500mAh x 2..

[Bongmaster]

where do u get them cameras?

[ironsmiter]

I actually have three total. One was a "prize", one was from a "dollar store", not sure if it was dollar gen, or which. The third was from wal-mart(shudder). that someone had bought, and when it turned out to take completely unacceptable images... got donated to me.

[Bongmaster]

hmm i dont think i have seen them here :S will have to keep an eye out :)