Fanuc alarm DS0308: APC ALARM: BATTERY LOW 2
servo APC alarm (absolute pulse coder) · Fanuc 0i-D
What it means
The battery voltage fell to the replacement threshold at some point in the past, including while the machine was switched off; this alarm latches until acknowledged even after a fresh battery is fitted. It tells you the absolute reference was at risk and should be verified by returning each affected axis to its reference position after battery replacement. Clear the alarm state per the maintenance procedure once a new battery is confirmed.
Likely causes
- Battery replaced late after a LOW 1 warning
- Machine left powered off for an extended period on an old battery
- Residual latch from a previous low-battery event
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- Request a quote →
A98L-0031-0012
battery · Common cause
- Request a quote →
A02B-0200-K102
battery · Common cause
Need the part urgently?
Send us alarm DS0308 with your machine details — typical RFQ turnaround is 24–48h.