Portable phone charger

Hi guys,

I want to design my own portable power bank for phone devices (or any USB devices).

I'm still deciding on whether I'll be using 3.7V Li-ion/Li-po battery.

Something like this: http://www.gadgetsfactory.com/aluminium-power-bank-portable-cell-phone-battery.html

It has a charging interface (micro USB) and has a standard A USB interface for discharging, such as to your phone.

Here's another one http://www.ebay.com/itm/5V-Mini-USB-1A-Lithium-Battery-Charging-Lipo-Charger-Module-for-Arduino-A866-MA-/131304520047 but I believe it only charges the Li-ion/Li-po battery and doesn't have output voltage to apply to a phone for example.

Here's one with the management system which I wish to have some feedback if anyone has used it. It's the Lipo rider. http://www.ebay.com.au/itm/1pcs-new-Arduino-Compatible-Solar-Charger-shield-LiPo-rider-/381714472087?hash=item58dff49c97:g:0FIAAOSw0RpXlvxO Any feedback on this?

Does anyone have recommendations that's similar to the Lipo rider?

I'm free for any suggestions (positive or bad).

Thanks Arduinians.

One possibility is to go for a LiFePO4 pack instead of LiPo, not as dense an energy store, but vastly less likely to catch fire. There are charge management chips for LiFePO4 available.

I've used an MCP73123 LiFePO4 charger chip together with an TS1935CX5 boost converter for a similar project, schematic/layout available if you are interested.

thanks for the feedback.

Yes, email?

MarkT: One possibility is to go for a LiFePO4 pack instead of LiPo, not as dense an energy store, but vastly less likely to catch fire. There are charge management chips for LiFePO4 available.

I've used an MCP73123 LiFePO4 charger chip together with an TS1935CX5 boost converter for a similar project, schematic/layout available if you are interested.

Mark, how can I get my hands on these schematic?