Laptop battery to charge cell phone or tablet
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.
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.