Laptop battery to charge cell phone or tablet

I have a couple of L11S6Y01 Lenovo Lithium Ion batteries 10.8V nominal, 48WH, 4400mAH batteries and a couple of their AC adapters lying around the house.

I was looking up the Minty boost DIY battery back up and I was thinking of making this battery back up kit to recharge my iPhone and Samsung tablets, both of which can connect to USB power sources.

My idea:

1) Get a 7 pin connector that will connect directly to my AC adapter.
For example: http://www.ebay.com/itm/External-Laptop-Battery-Charger-for-Lenovo-IdeaPad-B570-G470-G570-Z570-L09L6Y02-/121091427052?pt=Laptop_Batteries&hash=item1c319c8aec

Maybe I can scavenge one such connector from this place:  http://www.ebay.com/itm/IBM-X60S-Battery-Connector-/350772373819?pt=UK_Computing_Other_Computing_Networking&hash=item51aba9a93b

2) Build a circuit similar to Minty boost : http://www.ladyada.net/make/mintyboost/icharge.html

Except in this case, my source is a Li Ion rechargeable battery instead of 2 AA batteries.

Any ideas and thoughts would be appreciated.

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Baron_Kaz (author) 4 years ago
http://www.ebay.com/itm/IBM-Lenovo-Thinkpad-380XD-Battery-Charger-DC-IN-USB-S-Video-Board-05K3195-/130776668475?pt=LH_DefaultDomain_0&hash=item1e72e5993b
Baron_Kaz (author) 4 years ago
http://www.ebay.com/itm/Genuine-OEM-Lenovo-Ideapad-U300S-2DU-Battery-Connector-Power-Cable-/400455945840?pt=LH_DefaultDomain_0&hash=item5d3d08ce70
Baron_Kaz (author) 4 years ago
http://pdfserv.maximintegrated.com/en/ds/MAX756-MAX757.pdf
Baron_Kaz (author) 4 years ago
http://www.mouser.com/ProductDetail/STMicroelectronics/L7805ABV/?qs=xv3lWMc77RfDowMbrj6NxQ%3D%3D&gclid=CK_IrJ666bYCFUQ6QgodV3QAqQ

7805 voltage regulator takes up to 35v and drops it to 5v DC.
Baron_Kaz (author)  Baron_Kaz4 years ago
https://www.youtube.com/watch?v=VBAY_j_4CJc