Help LG G2 SERIES OF PHONES RED LED LIGHT 8 TIME BEEPING

[Android Question]

PLEASE HELP I GET A RED LED LIGHT BEEPING 8 TIMES PAUSE THEN RESTART THE PROCESS AGAIN
I CHANGED MY OLD BATTERY TO A NEW ONE AND IT WONT POWER ON BUT WHEN I PLUG IN CHARGER LG LOGO POPS UP THEN PHONE TURNS OFF THEN THE RED LED LIGHT BEEPS 8 TIMES AGAIN
HOW TO FIX?
WHEN I USE OLD BATTERY PHONE WORKS BUT I CANT CHARGE MORE THEN 2% WITH OLD BATTERY :/