2026-07-22 · 5 min read
Mercedes CLS Battery Replacement Malaysia — AGM + IBS
CLS battery is located in the boot on C218 and C257. AGM battery only — IBS sensor coding via XENTRY mandatory. C257 with EQ Boost has additional 48V lithium battery separate from the 12V AGM. Malaysia 12V AGM cost RM 700–1,100.
CLS Battery — Boot-Mounted AGM + IBS
- Battery in boot on both C218 and C257 — AGM only
- IBS coding via XENTRY mandatory — Malaysia 12V AGM cost RM 700–1,100
- C257 EQ Boost: also has separate 48V lithium battery — diagnosis is different system
Mercedes AGM Battery — Malaysia Replacement
Mercedes-Benz models require AGM (Absorbent Glass Mat) batteries — standard flooded batteries are NOT compatible with the battery management system (BMS). The BMS must be recoded after any battery replacement — without coding, the alternator charges incorrectly and the stop-start system malfunctions. Budget RM 550–900 for an AGM battery with coding at an independent workshop. In Malaysia's heat, expect battery life of 2–3 years (AGM handles heat better than flooded but still degrades). Varta, Bosch, and OEM Mercedes are recommended brands.