ASUS B31N1842 Replacement Laptop Battery | 11.52V 42Wh 3-Cell for VivoBook 15 X513 F513 K513 M513 S513 S15 S531 Series

Q1: Does B31N1842 fit both Intel and AMD versions of the VivoBook 15?
Yes. ASUS used the same battery bay, connector, and BMS protocol across both Intel Core (X513EA, F513EA, K513EA) and AMD Ryzen (X513IA, M513IA, KM513UA) variants of the VivoBook 15. This is one of the more buyer-friendly decisions ASUS made on this platform — it means a repair shop or distributor does not need separate SKUs for Intel and AMD chassis. The only verification needed before ordering is confirming the original battery label shows B31N1842 or 0B200-03440000.

Q2: What is the difference between B31N1842 and B31BmE1 — are they the same battery?
Yes, they are the same physical battery. B31BmE1 is an alternative ASUS labeling designation used on some production runs of the same platform. Both model codes cross-reference to spare part number 0B200-03440000 in ASUS service documentation. The cell stack configuration code 3ICP5/57/80 appears on both. For wholesale procurement, 0B200-03440000 is the most reliable canonical reference — it is consistent across ASUS regional distribution systems globally and is the number to use in purchase order documentation.

Q3: Why do B31N1842 listings show different mAh values — 3,536mAh, 3,600mAh, and 3,653mAh?
These are normal production tolerance variations within the same 42Wh cell platform. At 11.52V, a 42Wh pack produces an mAh figure of approximately 3,646mAh — differences between listings reflect cell lot variance and rounding conventions rather than different battery versions. For incoming QC, use the Wh figure as your primary metric, not mAh: a genuine 42Wh pack discharged at 0.5C should return 40–44Wh at room temperature. Any unit consistently returning under 39Wh warrants rejection regardless of what the label states.

Q4: The VivoBook 15 requires bottom panel removal to replace the battery. What should repair shops know before ordering in bulk?
The VivoBook 15 X513/F513/K513 chassis uses Phillips screws with no adhesive on the bottom panel — disassembly is straightforward with no heat gun or spudger required. The battery connector is a ZIF-style plug on the right edge of the pack. No ribbon cables route across the battery bay on this chassis, which significantly reduces the risk of accidental cable damage during replacement. Estimated technician time per unit is 4–6 minutes including reassembly. For shops processing bulk refurbishment batches, the tool-only disassembly and clean routing make this one of the faster internal battery swaps in the ASUS consumer lineup.

Q5: Does B31N1842 also fit the VivoBook 15 OLED (K513EQ, X513EQ) variants?
Yes. The OLED display variants of the VivoBook 15 use the same chassis and battery bay as the standard IPS variants. ASUS did not change the battery specification when introducing the OLED panel option — the K513EQ, X513EQ, and S513EQ all use B31N1842. For repair shops and distributors seeing increasing demand for OLED VivoBook 15 battery replacements — the OLED variant was particularly popular in the 2020–2021 sales cycle — this means no separate SKU is required to cover both display types.

Q6: What is your supply chain setup for B31N1842 and how do you handle batch consistency across repeat orders?
B31N1842 is a standing inventory SKU in our ASUS consumer battery lineup. We maintain finished-goods stock specifically for this platform due to its consistent cross-generational demand. For repeat wholesale buyers, we source cells from a fixed supplier pool and document the cell lot number on each shipment’s Certificate of Conformance. This allows buyers to track performance across order cycles — if a particular batch shows higher-than-normal variance in your incoming QC, the lot number on the CoC is the reference to flag with us. Standard bulk orders ship within 3–5 business days. Mixed-SKU orders combining B31N1842 with other ASUS platform batteries are supported in a single purchase order.