I use surge protector wall outlets that have USB ports in them to charge my phones: [1]http://www.amazon.com/gp/aw/d/B00ATZJ606/ref=mp_s_a_1_1/175-6650613- 8456264?qid=1414724024&sr=8-1 There are travel versions that are handy too. I partly got these as an alternative to traditional long surge protectors and have found them to be really useful at conferences and coffee shops. ~ Griffin On October 30, 2014 8:37:27 PM EST, Peter Gutmann wrote: mroq qorm writes: On Thu, Oct 30, 2014 at 3:21 PM, Tomasz Rola wrote: USB condom, great name :-). [2]http://syncstop.com/ - there was an open hardware version of this somewhere, but maybe all that went away when they got a new name and a hipster website ... not for the purpose you are discussing but still useful. More generally, search for "charge only usb cable" and you'll find lots of things like this, e.g: [3]http://www.ebay.com/itm/2M-6ft-LONG-THICK-Fast-Charging-ONLY-USB- Cable-WHITE-4-iPad-Air-2-mini-3-Retina-/291161982615?pt=US_Tablet_eR eader_Chargers_Sync_Cables&hash=item43ca9b4697 [4]http://www.ebay.com/itm/High-Speed-Charge-Only-Micro-USB-Charging -Cable-Android-Quality-Fast-Charger-/221266793926?pt=UK_MobilePhones _MobilePhoneAccessories_MobilePhoneChargers&hash=item33848755c6 [5]http://www.ebay.com/itm/GYRRH-Micro-USB-Power-Charge-Only-Cable-3 ft-91cm-Yellow-/131304066524?pt=US_USB_Cables_Hubs_Adapters&hash=ite m1e92550ddc Something like this, $1.99 including shipping: [6]http://www.ebay.com/itm/Micro-USB-2-0-Charging-Charge-Only-Cable- For-Samsung-Galaxy-HTC-Nexus-Android-63-/111283024587?pt=US_Cell_Pho ne_PDA_Cables_Adapters&var=&hash=item19e8fc32cb is great for carrying around for charging your phone when you're travelling, just mark it in some way so you don't get frustrated when you can't sync your phone with it... Peter. References 1. http://www.amazon.com/gp/aw/d/B00ATZJ606/ref=mp_s_a_1_1/175-6650613-8456264?qid=1414724024&sr=8-1 2. http://syncstop.com/ 3. http://www.ebay.com/itm/2M-6ft-LONG-THICK-Fast-Charging-ONLY-USB-Cable-WHITE-4-iPad-Air-2-mini-3-Retina-/291161982615?pt=US_Tablet_eReader_Chargers_Sync_Cables&hash=item43ca9b4697 4. http://www.ebay.com/itm/High-Speed-Charge-Only-Micro-USB-Charging-Cable-Android-Quality-Fast-Charger-/221266793926?pt=UK_MobilePhones_MobilePhoneAccessories_MobilePhoneChargers&hash=item33848755c6 5. http://www.ebay.com/itm/GYRRH-Micro-USB-Power-Charge-Only-Cable-3ft-91cm-Yellow-/131304066524?pt=US_USB_Cables_Hubs_Adapters&hash=item1e92550ddc 6. http://www.ebay.com/itm/Micro-USB-2-0-Charging-Charge-Only-Cable-For-Samsung-Galaxy-HTC-Nexus-Android-63-/111283024587?pt=US_Cell_Phone_PDA_Cables_Adapters&var=&hash=item19e8fc32cb