45N1738 72Wh 11.22V Replacement Battery for Lenovo ThinkPad X240 X250 T440 T450 T460-68+ Wholesale China
-
OEM P/N: 45N1738 | Cross-references: 45N1136, 45N1134, 45N1135, 45N1137, 45N1132, 45N1133, 45N1128, 45N1129, 45N1130, 45N1131, 45N1124, 45N1125, 45N1126, 45N1127, 45N1777, 45N1737, 45N1734, 45N1736, 45N1767, 45N1775, 0C52861, 0C52862, 121500147, 121500148, L16M3P72, SB10K97603, 01AV460, 68+
-
Specs: 11.22V · 6034–6340mAh (batch variance; 72Wh authoritative) · 72Wh · Li-ion · 6-cell · Black
-
Compatible series: ThinkPad X240 · X250 · X260 · X270 · T440 · T440s · T450 · T450s · T460 · T460P · T470P · T550 · T560 · L450 · L460 · L470 · W550 · W550s · P50S · S440 · S540 · K2450 · A275
-
Procurement note: 68+ (72Wh, this listing) and 68 (48Wh) share the same physical connector and fit the same device population — both capacities are available; this listing covers the 72Wh 68+ variant only; from stock, mixed-SKU orders accepted, low MOQ
-
Voltage tier: 45N1738 appears with four voltage labels across production batches — 10.8V, 11.1V, 11.22V, and 11.25V — all referring to the same 6-cell Li-ion unit; 11.22V is the primary OEM specification.
Product Description
he ThinkPad X240, X250, X260, and X270 are Lenovo’s most-deployed 12.5-inch business ultrabooks across the 2013–2018 production window, with the parallel T440-through-T470P and L450-through-W550 series covering the 14-inch and 15.6-inch corporate mainstream simultaneously. The 45N1738 is the 72Wh 6-cell battery — the higher of two available capacities for this platform family — covering all of these series under the Lenovo 68+ designation. The installed base across all compatible series is substantial enough that this P/N generates consistent repair and replenishment volume across both the aftermarket service channel and corporate IT refresh programmes.
Every compatible model in this listing — from ThinkPad X240 through A275 — shares the same battery bay geometry and connector position for the rear-slot external battery. The 68+ designation distinguishes this 72Wh unit from the 68 (48Wh) variant: both fit the same chassis physically, but the 72Wh pack provides approximately 50% more runtime per charge cycle, making it the preferred replacement for users who prioritised extended runtime in the original device configuration. For a repair depot managing high-volume X240 or T440 repair queues, specifying 68+ at the order stage eliminates runtime downgrade complaints from end users.
For procurement managers refreshing batteries across a mixed fleet of X-series and T-series ThinkPads from this generation, the shared 68+ specification creates a single-SKU ordering path regardless of whether the population is primarily X240/X250 or T450/T460 — provided the original battery in each device is the 6-cell variant. The pre-order verification step is to confirm the original battery carries a 68+ or 72Wh label, rather than the 48Wh 68 designation, before committing quantities.
Technical Parameters
| Parameter | Specification |
|---|---|
| Battery Model | 45N1738 |
| Compatible Part Numbers | 45N1136 · 45N1134 · 45N1135 · 45N1137 · 45N1132 · 45N1133 · 45N1128 · 45N1129 · 45N1130 · 45N1131 · 45N1124 · 45N1125 · 45N1126 · 45N1127 · 45N1777 · 45N1737 · 45N1734 · 45N1736 · 45N1767 · 45N1775 · 0C52861 · 0C52862 · 121500147 · 121500148 · L16M3P72 · SB10K97603 · 01AV460 · 68+ |
| Brand Compatibility | Lenovo |
| Voltage | 11.22V nominal (10.8V / 11.1V / 11.25V on various batch labels — all electrically equivalent; 11.22V is the primary OEM specification) |
| Capacity | 6034–6340mAh (batch variance; 72Wh is the authoritative specification) |
| Energy | 72Wh (68+ designation) — Note: 48Wh (68 designation) variant also exists for the same chassis; this listing is 72Wh only |
| Cell Type | Li-ion |
| Cell Configuration | 6-cell |
| Color | Black |
| Condition | New, OEM-compatible replacement |
| Cycle Life | ≥500 charge cycles |
| Certifications | CE · FCC · RoHS |
| Warranty | 12 months |
| Package Includes | 1 × 45N1738 replacement battery (72Wh / 68+) |
| Compatible Laptop Models | ThinkPad X240 · X250 · X260 · X270 · T440 · T440s · T450 · T450s · T460 · T460P · T470P · T550 · T560 · L450 · L460 · L470 · W550 · W550s · P50S · S440 · S540 · K2450 · K20-80 · K21-80 · A275 — NOT compatible with: X240S · T440P · T450P · T460S · T470 · T470S · T550S · T550P · T560S · T560P · P50 |
| Application | Lenovo ThinkPad X/T/L/W-series — OEM-grade replacement, MSP service contract supply, insurance repair fulfillment |
| Supply Type | Wholesale · From stock; mixed-SKU orders welcome |
Need a stable supply plan? Send your model list + quantities + destination. We’ll confirm lead time, shipping method, and compliance documents before you place the order.
Features & Advantages
✅ 🔋 72Wh Versus 48Wh: What the Capacity Difference Means at the Cell Level
The 45N1738 68+ uses six Li-ion cells arranged to deliver 72Wh at 11.22V — compared to the 48Wh 68 variant which uses fewer or lower-capacity cells in the same physical housing. At procurement level, choosing the 72Wh replacement for a device that shipped with a 72Wh original maintains the end user’s original runtime specification; fitting the 48Wh variant instead is a capacity downgrade that generates end-user complaints even if the battery is functionally correct. For depot workflows that prioritise zero post-replacement escalations, matching the 68+ designation on the original battery label to the 68+ stock SKU is the single most reliable quality control step in the repair process.
✅ 🔗 One SKU Spans Five ThinkPad Series Across Five Production Years
The 45N1738 and its cross-reference P/N family covers the ThinkPad X240 through X270 (2013–2017), T440 through T470P (2013–2017), L450 through L470 (2015–2017), W550/W550s (2015), P50S (2016), and A275 (2017) — a continuous compatibility arc across five years of Lenovo’s mainstream commercial laptop output. A repair depot stocking this single SKU holds 68+ battery coverage for the majority of a corporate fleet that completed a 12.5-inch and 14-inch ThinkPad refresh cycle between 2014 and 2018, without segmenting stock by model year or screen size.
✅ ⚙️ ThinkPad Dual-Battery EC Architecture and BMS Behaviour
Several models in this compatibility list — including the X240, X250, T440, and T440s — support Lenovo’s dual-battery configuration, where an internal front battery (45N1111 family, 24Wh) and this external rear battery operate in tandem under EC coordination. A replacement 45N1738 installed without the internal battery present will operate normally as a standalone unit; however, the EC’s battery management display in Lenovo Energy Manager may report a combined charge percentage that differs from expectation until the internal battery is also serviceable. The BMS on this unit manages short-circuit interrupt as the primary load-side protection, with over-discharge cutoff preventing cell damage during the deep-discharge state that commonly occurs when devices are stored without use between fleet refresh cycles. Overcharge protection operates at the cell-pack ceiling as the charge-path response.
✅ 📦 SKU Consolidation Across a Multi-Series Mixed Fleet
A replenishment order for a corporate fleet containing X250, T450, and L460 units — all common co-deployments from the 2015–2016 Lenovo commercial cycle — maps to a single 45N1738 line item rather than three separate SKUs. This compresses both the purchase order and the inbound receiving process: one P/N to inspect against the order, one bin location to maintain, one cross-reference to validate across three device populations. Wholesale orders are available from stock at low MOQ; distributors and repair depots can combine this line with other ThinkPad battery SKUs in a single consolidated replenishment order.
✅ ⚠️ Model Exclusions That Prevent Installation Errors
The 45N1738 does not fit every ThinkPad model that superficially resembles the compatible list. Key exclusions with confirmed connector or bay incompatibilities: T440P and T450P (use a different external battery family at a different voltage), T460S and T470 and T470S (moved to an internal-only battery design with no external rear slot), T550S, T550P, T560S, T560P (variant suffixes indicate different battery bay configurations), and X240S (a different physical form factor from the X240 despite the similar name). A repair depot receiving devices from any of these excluded variants must source against the specific model’s battery P/N rather than treating the 68+ as a universal X240/T440-generation solution.
Packing & Delivery
Lead Time & Shipping
In-stock items: Ship within 3 days
For standard replacement models with available inventory.Mass production orders: Ship within 7 days
For regular models under confirmed specifications and packaging requirements.Customized orders: Ship within 15 days
For custom cell configuration, size, wire/connector, PCB/BMS, labeling, or packaging.
Note: Final dispatch time depends on total quantity, model complexity, packaging requirements, and shipping compliance documents. We will confirm the estimated shipping date (ETD) after order confirmation.
Air freight (urgent, smaller volume)
Sea freight (cost-effective for bulk)
Rail / Truck (subject to destination)
Express channels
Documents available: UN38.3 / MSDS / Transport Test Report (if applicable)
Compliant packaging and carton labeling can be arranged based on the chosen shipping method.
EXW / FOB / CIF / DDP available
FAQ
Q1: What is the practical difference between the 68 (48Wh) and 68+ (72Wh) for this device population — and is it safe to substitute one for the other?
A1: Both the 68 (48Wh) and 68+ (72Wh) fit the same physical battery slot in every compatible model and are electrically interchangeable — the system will charge and operate correctly with either. The difference is runtime: the 72Wh unit delivers approximately 50% more battery life per charge cycle than the 48Wh unit. Substituting a 48Wh replacement for a device that shipped with 72Wh is technically functional but represents a runtime downgrade that end users will notice. For service depots aiming to restore original device specification, matching the capacity designation on the removed battery label is the correct sourcing practice. This listing covers the 72Wh 68+ only; the 48Wh 68 is a separate SKU.
Q2: Four different voltage figures appear across listings for this P/N — 10.8V, 11.1V, 11.22V, and 11.25V. Which is correct, and does it affect compatibility with the ThinkPad’s USB-C or barrel-connector charging?
A2: All four voltage figures refer to the same 6-cell Li-ion battery. They reflect different rounding conventions used across Lenovo’s own documentation and third-party aftermarket listings for the nominal voltage of a 3S2P Li-ion configuration. The charging system in the ThinkPad X240-through-X270 and T440-through-T560 range uses a barrel-connector AC adapter, and the charge controller accepts the full cell voltage range of this battery family regardless of which nominal figure is printed on the label. For procurement records, 11.22V is the primary OEM specification and the most widely cited figure across Lenovo’s service documentation.
Q3: Does this battery fit the ThinkPad X240S or T440P? These models appear near the compatible list in many search results.
A3: No to both. The ThinkPad X240S uses a physically different chassis design from the X240 — despite the similar name, the X240S has a different battery bay configuration that does not accept the 45N1738. The T440P and T450P carry a “P” suffix indicating a performance variant with a different external battery family at a different connector and voltage specification. Both exclusions are confirmed across multiple parts sources. If a repair queue includes X240S or T440P units alongside X240 and T440 standard units, the X240S and T440P devices require separate battery SKUs sourced against their specific model P/N.
Q4: After installing 45N1738, the ThinkPad X250 shows 0% battery and does not charge, even with the AC adapter connected. What is the most likely cause?
A4: On the ThinkPad X250 and the broader X240-generation platform, a 0% non-charging state immediately after installation almost always means the battery has arrived in a deep-discharge protection state — the BMS has shut down output to prevent cell damage, and the EC cannot initiate a charge cycle from this state through normal power-on. Leave the AC adapter connected with the laptop powered off for 20–30 minutes; the charge controller will trickle-charge the battery out of the protection state before the EC takes over. Do not hold the power button or attempt forced power-on during this period. If charging does not begin after 30 minutes, disconnect and reconnect the battery connector with the AC adapter still plugged in, which resets the charge initiation sequence.
Q5: A repair centre needs to order 45N1738 alongside internal front-slot batteries (45N1111 family) for the same X240 and T440s fleet — can these be combined in one order?
A5: The 45N1111 internal battery family and 45N1738 external battery are separate SKUs covering different physical positions in the dual-battery X240 and T440s chassis, so a depot managing full battery replacement on these models — replacing both the internal and external packs — needs both SKUs on the same purchase order. Rather than raising separate orders per part number, submit both the 45N1738 quantities and the 45N1111-family quantities as line items in a single wholesale order. Low MOQ applies across the total order. Provide the split quantities for each SKU when requesting a quote to receive a single lead time covering both parts.
Q6: Several Amazon listings for this P/N family report that ThinkPad X270 units throttle CPU performance after installing an aftermarket 45N1738. Is this a real issue and how should it be handled?
A6: This is a documented behaviour specific to the ThinkPad X270 and some X260 units. Lenovo’s EC on these models performs a battery authentication check that, when the replacement battery’s BMS does not pass the check precisely, causes the EC to throttle the CPU as a power protection measure. The most reliable resolution is a BIOS update to the latest version via Lenovo’s support site — several BIOS revisions for the X270 specifically addressed this aftermarket battery throttling behaviour. If throttling persists after a BIOS update, the ThrottleStop utility can suppress the EC throttle flag as a software workaround, though a BIOS update is the correct permanent fix. This issue does not affect X240 through X260 models or the T-series compatible models.
Related Products
Looking for more laptop battery models for distribution? Browse our wholesale laptop battery category for bulk supply and factory pricing.
