Electronics 2000

Hi all!

I am in need of help with the attached circuit. this circuit is for a backup for a traffic light. When the mains power is connected, the battery is charged and the light shines continuously. When the mains power is cut, the circuit activates the 555 timer and in turn lets the traffic light blink.

The problem I am having, is that when the mains power is cut, the circuit initially does as it should. After a short while, the time between blinks increase and then the light just suddenly turns off.

Please, can anyone help me with this? I am completely stumped...

It seems I forgot to attach the circuit, anyway, here it is!

I've found the problem. For anyone maybe struggling with the same sort of problem...

I noticed that I had too much input current for the 555 IC to handle. I just put a 1k current limiting resistor at its input, and now it works fine