How to recharge an ipad battery used to power 3v led lights externally?

I pad 4 replacement batteries are cheap and are natively about 3.7v 11.5 amphrs. And their slim form factor is exactly what I need for my led project. but how the heck do I recharge them since they are used outside of an ipad?
would this device work well? http://www.ebay.com/itm/122534894430


Incase you are curious here are more details: Basically I've mounted 3v 3w led cob strips onto a mirror and I use the light to take selfies.

These are the leds I am planning to use https://www.aliexpress.com/item/10X...lgo_pvid=485e0330-8b0a-49e9-9ee4-9539c8edfe61

thanks for any help!

Lipos are for all intents and purposes, the same. What's needed is a simple charge/discharge circuit and an appropriate 5v supply.
Most batteries for cell phones have that circuit board built in but if they do not, any single cell cc/dc board will work.

rollandelliott said:

I pad 4 replacement batteries are cheap and are natively about 3.7v 11.5 amphrs. And their slim form factor is exactly what I need for my led project. but how the heck do I recharge them since they are used outside of an ipad?
would this device work well? http://www.ebay.com/itm/122534894430


Incase you are curious here are more details: Basically I've mounted 3v 3w led cob strips onto a mirror and I use the light to take selfies.

These are the leds I am planning to use https://www.aliexpress.com/item/10X...lgo_pvid=485e0330-8b0a-49e9-9ee4-9539c8edfe61

thanks for any help!

Click to expand...

Hobby charger for LiPo batteries. They are common for radio control models.

thanks so much for replying. above is the photo of the ipad 4 battery. it is made up of 3 cells each almost 4a, for a total of 11.56a. 3.7v.
there appears to be a charging bus already on the printed circuit board.
How fast of a charger can I use? I know 1amp will be slow so I thought this 2amp would be good

If I use this charing board do I have to remove the ipad buildt in bus and just have this charging board going directly to ipad battery? or do I leave ipad charing bus in place?
below is description of the charger
Lithium ion battery 5V 2A Dual USB all-in-one boost charge iPhone capacity LCD
http://www.ebay.com/itm/Lithium-ion...745765?hash=item19dd587ae5:g:pPsAAOxyIAZRq0ja

most hobby lip chargers are huge! I want it to be small so I can integrate it into my handheld selfie mirror. AND I'd prefer a simple usb cable to charge as well.

Do you need to run the lights on batterie?. Can you not just use a mains PSU of the correct voltage and current?
Just thinking outside the box.
P
Sorry, thought the mirror was on the wall, forget I spoke.
P

actually this charger looks better since it can do 3amps and I think ipad batteries will take up to 2.4a. I just need to include a 5v power source which are cheap and easy to find. what do you folks think?


http://www.ebay.com/itm/4-2V-3A-Cha...987728&hash=item1c70e59a31:g:prcAAOSwOyJX41iV

the mirror is small and handheld. the leds will be on the very top. I'll probably 3d print a small holder. this is why I am using a thin lipo battery so it can fit inside of this handheld mirror.

or am I totally over thinking this? maybe I can just hook up 5v power to the integrated circuit? no need for me to buy separate charger? how would I test this? just try and hope batteries don't explode? lol. gotta be a safer way. I know basics of using multimeter.