I am trying to build a powerbank as a project. Here is the current setuphttp://imgur.com/a/gYi4jI have got a 3.7v 10,000 mah Li-ion battery. A TP4056 Li-ion charging module to charge the batteryNow the questions on my mind are:If i connect the positive and negative leads of the battery output to a cable, can i further use that cable to charge my phone?Do I need a DC-DC step up transformer for better charging speed? Like this oneHow will I prevent the battery from completely draining / overdischarging? I have read that a full discharge is detrimental to a battery's health.Is there any module available online that I can attach to the battery that can show left over charge in battery through leds or a small lcd?Can I connect 2 TP4056 Li-ion chargers in series to the battery for better charging speed? It takes a long time for a single TP4056 to charge this 10k mah battery.Any other advice? any precautions? something Im doing wrong with this? I dont have a lot of electronics background. Any advice is appreciated. via /r/DIY http://ift.tt/2rwvAaG
