0A36306​ ThinkPad Battery 44+ 6-Cell — 11.1V 63Wh Li-Ion, Compatible with X220 / X230 Series

Description

Technical Specifications

Main Features and Advantages

63 Wh mid-tier capacity balances runtime and chassis fit.​ The 0A36306​ sits between the 44 Wh 4-cell (0A36305, which can feel short on an 8-hour plant audit) and the 94 Wh 9-cell (0A36307, which bulges the bottom and can foul the X230 dock or rear foot). For field engineers running Siemens PCS 7 commissioning sessions, ABB Drive Composer, or Rockwell Studio 5000 on an X230, the 0A36306​ typically delivers 5–7 hours of mixed-load runtime (WiFi on, screen ~60%, occasional PDF drawings + TIA Portal open), which covers a morning outage walkdown without a power brick. The 6-cell Li-Ion cylindrical format also ages more gracefully than the 4-cell polymer used in some thinner ThinkPad lines — fewer swelling incidents in hot service-van consoles.BMS integration with ThinkPad power manager.​ The 0A36306​ includes a TI/BQ-family fuel-gauge IC talking SMBus to the host, so Lenovo Vantage and the BIOS power tab show cycle count, designed capacity vs. full-charge capacity, and temperature. For asset managers tracking a fleet of 20+ X230 field laptops, that telemetry lets you pull a 0A36306​ before it hits the knee of the degradation curve (typically 300–400 cycles for Li-Ion before capacity drops below 80%). The BMS also enforces charge-current taper and cutoff, so leaving the 0A36306​ on the 65 W ThinkPad brick overnight won’t cook the cells — the charger hands off to the BMS at ~80% SOC and trickles.External-charger compatible for zero-downtime swap.​ The 0A36306​ works with the Lenovo 40Y7625 external bay charger, a detail that matters for service teams. A commissioning engineer can keep a topped-up 0A36306​ in the 40Y7625 in the truck, swap the drained one out of the X230 at the MCC, and be back online in 30 seconds — no hunting for a live 120 V receptacle in a damp pump house. For plants where outlet access near the control panel is hit-or-miss, this workflow keeps the laptop alive through a 10-hour startup.Cross-FRU compatibility inside the 44-family.​ The 0A36306​ shares BMS firmware lineage with the broader X220/X230 battery FRU cluster: 42T4861–42T4876, 42T4899–42T4902, 42T4940–42T4942, 42Y4864/4868/4874, and the 45N1018–45N1028 series. For spare-parts buyers, this means a 0A36306​ pulled from a decommissioned X220 will seat and run in an X230 without complaint — the EC (embedded controller) on both machines accepts any valid 44-family FRU. That cross-compatibility keeps the spare shelf lean: one SKU covers X220/X220i/X230/X230i fleets.CRU status = no depot RMA hassle.​ Lenovo classes the 0A36306​ as a Customer Replaceable Unit with 1-year warranty, meaning a swollen or dead pack is handled by shipping a replacement and returning the core in the same box — no depot diagnosis queue, no “send the whole laptop” RMA. For corporate IT managing field-laptop fleets, that’s the difference between a same-day swap and a 10-day downtime.

Application Field

The 0A36306​ is specified almost exclusively for ThinkPad X220/X220i/X230 units, but the use cases for those laptops explain why the battery still moves volume in 2026. Industrial-automation field engineers are the quietest but steadiest buyer segment: Siemens PCS 7 / TIA Portal, ABB Drive Composer / Control Builder, Rockwell Studio 5000 / RSLinx, Honeywell UniSim / Experion PKS configuration tools, and Emerson DeltaV “laptop-class” commissioning rigs all still run comfortably on an X230 with 8–16 GB RAM and an SSD — and many plants mandate a physical Ethernet port (which the X230 has natively, unlike modern Ultrabooks that need dongles that get left on the hotel nightstand). The 0A36306​ is the field-swappable power source for those commissioning sessions: 5–7 hour runtime covers a morning MCC walkdown, an afternoon DCS node download, and the drive-parameter checkout without tethering to a 110 V drop that may not exist near the cabinet.Corporate IT refresh cycles are the second slice. X220/X230 fleets in finance, legal, and government still run because the 7-row classic keyboard and the docking-station ecosystem (Mini Dock Plus Series 3) haven’t been replicated cleanly on newer ThinkPads. The 0A36306​ is the mid-capacity refresh SKU for those fleets — IT buys 0A36306 in batches of 10–20 to rotate aging packs out of 5-year-old laptops that otherwise have 2–3 years left in them. The 9-cell (0A36307) is avoided in dock-heavy deployments because the bulge interferes with the dock latch; the 4-cell (0A36305) is avoided because 44 Wh dies before lunch. The 0A36306​ splits the difference.Spare-parts and refurb channels are the third steady use: decommissioned X220/X230 units from corporate leases get refurbed and resold into schools, labs, and developing-market NGOs — the 0A36306​ is the default “new” battery put in before re-sale because it’s the safest capacity/cost point. For buyers, the key risk is clone packs — the X220/X230 aftermarket is flooded with “0A36306” labels on generic Li-Ion packs with mismatched BMS firmware that throw “Battery Not Supported” in the ThinkPad BIOS. Genuine Lenovo 0A36306​ (or verified FRU-cross pulls from the 42T48xx / 45N10xx family) are the only safe buy for production-field laptops.