Bosch battery error codes

Symptom	Indicator	Cause/Corrective Action
LEDs #2 and #4 flash on the charge indicator		A defect is detected in the battery pack. Contact us for assistance.
LEDs #1 #3 and #5 flash on the charge indicator		The battery pack is outside of the charging temperature range. Attempt charging again when the pack is between 32° and 104° F.
No LEDs appear when pressing the indicator button		The battery pack is at or below 5% charge. Plug battery into charger.

The Bosch battery is protected from deep discharge, overcharge, overheat, and short-circuit by an internal Electronic Cell Protection (ECP). In these hazardous situations, the protective circuit automatically switches off the battery pack.