Charging problem

[scuba-hacker]

I am using a lithium cell to power the T4 Amoled 2.4 inch device through the battery socket on the back of the board. Battery power is delivered to the board without problems, the plug/socket and wiring are secure and moving the wires or touching with plastic tweezers the battery socket/plug doesn't interrupt power. The Red LED flashes as expected to show not charging.

I then connect a 5V USB supply through the header pins to charge the battery. When I first started using the screen earlier in the year the red LED would go steady and stay on until charging of the battery was finished whereupon the LED flashed once again - so far so good.

Now something strange is happening with the socket on the board. When I charge the battery it requires manipulation of the plug/socket/wiring to make the LED go steady red to make the battery charge and it can take a lot of fiddling to get the charging active again. The slightest touch makes the LED flash and my USB power meter shows that the battery has stopped charging. I then have to fiddle again with the socket and then the light, if I'm lucky, will go steady and charging recommences.

I know that the wiring/socket/plug is good for supplying power from the battery to the board, but there is a definitely a problem when the battery is charging.

When not charging current flow is 170mA. When charging current flow is 410mA.

I have to charge with the board power switch turned on because the plastic tip of the switch broke off soon after I bought the board.