Mentos PowerBank

this is my first time doing an instructable so go easy on me

Step 1: Stuff You Need

18650 3.7v 2200mah (from old laptop battery)
1A lithium charging module ($1.39 dx.com)
0.9v - 5v step up boost module ($1.99 dx.com)
slide switch ( from a broken toy)
Mentos chewing gum container

Step 2: Wiring

solder wires into module and battery + to + and - to - dont put it on backwards unless you want your modules to get toasted

Step 3: Stuffing Everything Inside

this is the hardest part for me since the container is too small. but you can figure it out.

Step 4: Done!

dont expect this to full charge your phone. when charging the powerbank red led means charging and green for full

Comments

[Ganesh sivakumar]

instead of a 2200mah battery can I use 9v battery

[pedrolrmurarolli]

I guess, but you need to use a step down for the output

[hassantobah222]

Can i use a car charger module

[hassantobah222]

Can I use 2 *3.7v to extend the mah

[betmac]

Yes, use as many as you like as long as its parallel, but the problem would be charging time unless you can charge each cell individually

[Ganesh sivakumar]

is this mentos power bank rechargeable

[DaytonaPete]

Very nice and simple. I'm building one!

[dmahato]

Hey, what about battery discharge protection ????

[betmac]

www.dx.com/p/tp4056-4-2w-1-2a-5v-lithium-battery-charging-discharging-protection-module-w-micro-usb-blue-397213#.VgXcBTOwrqA

[kartik negandhi]

can I connect 4 18650s in parallel to extend the mAh of the bank? or if not 4 den at least 2?

[neopolitan]

yes in theory, but in practise you need to isolate the cells from each other

[OrlandoSailor]

Please explain what you mean by "isolate the cells from each other". I would like to use the same parallel design suggested above. Thx!

[lazychris2000]

Basically, you would use a diode on each battery to prevent it from back-charging the other batteries.
Make sure you install them in the correct orientation because it only allows the charge to flow in 1 direction

[utkarsh.sharma.37201]

thanks alot

[siim.kuningas]

just in case: cheap ebay batteries are not protected

[MagnusK]

Hey, do you know what gauge wire you used?

[betmac]

im not sure. i just scavenge those wires from a broken fan.

[Essahihi Mostafa]

nice

[JasonM11]

if you want longer batt life you can get wafer type RC 1 cell lithium's from hobby king for a very cheap price, great build by the way.... Lastly everything in life is dangerous however, this isn't going to be risky the current coming out of the battery is very low. If you were to allow the battery to get to low of a charge and it was an unprotected battery then you could have an issue. but that battery is protected so there isn't any worries there.

[samalert]

How much time does is take to fully charge a cell phone from Dead.