This is often caused by a loose battery. If the battery is not screwed in properly, it won't be able to fully charge and the indicator light will continue to blink. To fix this issue, unscrew the battery and re-screw it back in to make sure everything is firmly connected.
Why does my ooze pen keep blinking green 4 times?
When your battery is having a connection issue, the battery will typically blink green 4-5 times. There are two ways you can have a connection issue, either your cartridge is leaking, you have an irregular-sized cartridge or a deformed coil.
Why does my pen keep blinking even though it's charged?
Low voltage: If the battery is charged but the pen is still blinking, it could be due to a low voltage. Low voltage often comes about due to poor battery connections, either due to dirt or improper lineup.