To read a smartphone battery model number, locate the prominent alphanumeric code printed on the front face of the pouch cell: Samsung uses EB-B[Model][Suffix] (e.g., EB-BG781ABY), Xiaomi uses 4-character platform IDs (BN for Redmi/Poco, BM for flagship Mi lines), Huawei uses a dimensional formula HB[Thickness][Width][Length][Suffix] (e.g., HB366481ECW = 3.6mm × 64mm × 81mm), Apple prints laser-etched A-Numbers (A2655) and 616- APNs, and BBK brands (Oppo/OnePlus/Realme) use BLP codes.
Decoding these OEM model codes is one of the most powerful skills a repair technician, refurbisher, or parts distributor can possess. Rather than treating every smartphone battery as a proprietary, single-device component, understanding battery numbering syntax allows you to instantly determine the original donor device, verify physical dimensions without a digital caliper, check high-voltage charging cut-offs, and unlock cross-compatibility across dozens of phone models.
In this comprehensive hardware guide, the Partify Lab breaks down the anatomy of a battery label and decodes the internal part-numbering systems of every major smartphone manufacturer.
The Anatomy of a Smartphone Battery Label: Key Metrics & Technical Specifications
Before analyzing brand-specific prefixes, every technician must understand the fundamental electrical and safety data printed on an OEM lithium-ion polymer (LiPo) battery pouch:
┌────────────────────────────────────────────────────────────────────────┐
│ ANATOMY OF A SMARTPHONE BATTERY LABEL │
├────────────────────────────────────────────────────────────────────────┤
│ 1. OEM MODEL CODE ▶ EB-BG781ABY / BN59 / HB366481ECW / BLP805 │
│ 2. CAPACITY METRICS ▶ Rated: 4400 mAh (17.02 Wh) │
│ ▶ Typical: 4500 mAh (17.41 Wh) │
│ 3. VOLTAGE RATINGS ▶ Nominal: 3.86 Vdc │
│ ▶ Limited Charge Voltage: 4.43 Vdc │
│ 4. SAFETY CERTIFICATIONS ▶ IEC 62133 / GB 31241-2022 / UL 2054 / CE │
│ 5. MANUFACTURING DATA ▶ 1ICP6/64/81 (Cell Composition / Dimensions)│
│ ▶ Production Date / 2D DataMatrix Serial │
└────────────────────────────────────────────────────────────────────────┘
1. Rated Capacity vs. Typical Capacity
Battery labels invariably list two distinct capacity figures: - **Rated (Minimum) Capacity**: The minimum guaranteed energy capacity under laboratory discharge testing standards (typically 0.2C discharge down to 3.0V at 25°C). This is the legally certified capacity used for regulatory compliance. - **Typical (Nominal) Capacity**: The average statistical capacity output of the manufacturing batch. Marketing materials always advertise the typical capacity (e.g., "5,000 mAh"), whereas the rated capacity on the cell may state 4,900 mAh.2. Nominal Voltage vs. Limited Charge Cut-Off Voltage
Understanding voltage limits prevents severe safety hazards during battery cross-swapping: - **Nominal Voltage (Vdc)**: The average operating voltage during a discharge cycle. Modern smartphone batteries typically operate at **3.82V, 3.85V, 3.87V, or 3.88V**. - **Limited Charge Voltage (Cut-Off Voltage)**: The maximum voltage threshold the phone's Power Management IC (PMIC) applies before terminating the constant-current/constant-voltage (CC/CV) charge cycle. - *Standard Li-ion*: 4.20V to 4.35V max. - *High Voltage (HV LiPo)*: 4.40V max. - *Super High Voltage (SHV LiPo)*: 4.45V max (standard on modern 33W–120W fast-charging devices).⚠️ Critical Safety Rule: Never install a battery rated for 4.35V limited charge voltage into a device whose PMIC charges to 4.45V. Continuous overcharging by 100mV decomposes the liquid electrolyte, accelerates metallic lithium plating, causes rapid pouch swelling, and creates an extreme thermal runaway risk.
3. Execution Standard Codes (`GB 31241` & `IEC 62133`)
Most smartphone battery cells display regulatory standard identifiers: - **GB 31241-2014 / GB 31241-2022**: The stringent Chinese National Standard for lithium-ion cells in portable electronic equipment. - **IEC 62133-2**: The international safety benchmark covering electrical, mechanical, and thermal abuse testing. - **1ICP / 2ICP Electrochemical Marking**: For example, `1ICP6/64/81` designates: - `1`: Single cell in series. - `I`: Lithium-ion chemistry. - `C`: Cobalt-based cathode (LCO - Lithium Cobalt Oxide). - `P`: Pouch (prismatic polymer) shape. - `6/64/81`: Nominal dimensions (**6.X mm thickness × 64 mm width × 81 mm length**).Samsung Battery Model Codes: Decoding `EB-B`, Suffixes & `GH82` Service Pack Numbers
Samsung employs a highly structured model-coding convention across its flagship Galaxy S, Note, Fold, and budget Galaxy A and M lines.
┌────────────────────────────────────────────────────────────────────────┐
│ SAMSUNG BATTERY CODE SYNTAX DECODER │
├────────────────────────────────────────────────────────────────────────┤
│ │
│ EB - B G781 A B Y │
│ ── ─ ──── ─ ─ ─ │
│ │ │ │ │ │ └── Factory / Market Distribution Code │
│ │ │ │ │ └───── Physical Package Format (B = Pouch) │
│ │ │ │ └──────── Chemistry Generation Revision (A / B) │
│ │ │ └──────────── Original Target Phone Model (SM-G781) │
│ │ └───────────────── Battery Architecture (B = Built-In Pouch)│
│ └───────────────────── Electronic Battery Prefix │
│ │
└────────────────────────────────────────────────────────────────────────┘
1. The Prefix Hierarchy: `EB-B` vs. Legacy Formats
- **`EB-B`**: Standard built-in Li-ion polymer pouch cell used in all modern sealed Galaxy smartphones (e.g., `EB-BG998ABY`, `EB-BA526ABY`, `EB-BS908ABY`). - **`EB-F` / `EB-L`**: Legacy removable plastic-cased batteries with exterior gold contact pads (e.g., `EB-BG900BBE` for Galaxy S5, `EB-L1G6LLU` for Galaxy S3). - **Budget Third-Party OEM Exceptions**: Certain entry-level Galaxy A and M devices manufactured under Original Design Manufacturer (ODM) contracts use non-standard prefixes, such as the universal [Samsung HQ-50S (GH82-24317A)](https://getpartify.app/blog/samsung/samsung-galaxy-a12-vs-a02s-vs-m12-parts-compatibility) (5,000 mAh) used across Galaxy A12, A02s, A03s, and M12, or `WT-S-N6` (Galaxy A01).2. Model Number Mapping
The middle alphanumeric segment reveals the primary phone model the cell was engineered for: - **`EB-BG781ABY`** ➔ Designed for the Galaxy S20 FE (`SM-G781B`/`SM-G781U`). Because Samsung reused this chassis layout, this exact battery is 100% compatible with the Galaxy A52 4G (`SM-A525F`), Galaxy A52 5G (`SM-A526B`), and Galaxy A52s 5G (`SM-A528B`). Explore the full [Samsung EB-BG781ABY Compatibility List](https://getpartify.app/blog/samsung/samsung-eb-bg781aby-battery-compatibility-list). - **`EB-BA536ABY`** ➔ Designed for Galaxy A53 5G (`SM-A536B`), also natively used in Galaxy A33 5G (`SM-A336B`). - **`EB-BS908ABY`** ➔ Designed for Galaxy S22 Ultra (`SM-S908B`), providing 5,000 mAh of 45W-compatible capacity. - **`EB-BS928ABY`** ➔ Designed for Galaxy S24 Ultra (`SM-S928B`).3. Suffix Deconstruction: `ABY`, `ABA`, `ABE`, `ABU`
The 3-letter suffix following the model designator indicates manufacturing nuances: - **Position 1 (Chemistry/Revision)**: `A` represents the original chemical formulation; `B` indicates a second-generation revision with updated electrolyte or separator materials. - **Position 2 (Packaging Type)**: `B` denotes a standard internal polymer pouch with a top welded Protection Circuit Module (PCM). - **Position 3 (Regional Supply Chain / Assembly Plant)**: - `Y`: High-volume global manufacturing (Samsung SDI Vietnam / Huizhou China plants). - `E`: European Union certified retail distribution pack. - `U`: North American carrier service replacement inventory. - `A`: Domestic Korean assembly line.Key Technician Takeaway: Batteries sharing the same base model number with different regional suffixes (e.g., EB-BG781ABY vs. EB-BG781ABE) are 100% electrically and physically interchangeable.
4. Bare Cell (`GH43-`) vs. Service Pack (`GH82-`)
When sourcing from authorized Samsung parts distributors, you will encounter Samsung's internal enterprise part numbering: - **`GH43-XXXXXA`**: Designates the bare battery cell only. - **`GH82-XXXXXA`**: Designates an official Samsung Service Pack. This includes the battery pre-mounted inside an adhesive carrier tray with laser-cut pull tabs, protective thermal dissipation tape, and battery compartment gaskets.Xiaomi, Redmi & Poco Battery Codes: The `BN`, `BM`, `BP` & `BW` Series Decoded
Xiaomi utilizes a compact 4-character alphanumeric coding format across its vast ecosystem of Xiaomi, Redmi, and Poco devices.
┌────────────────────────────────────────────────────────────────────────┐
│ XIAOMI ECOSYSTEM BATTERY PREFIXES │
├────────────────────────────────────────────────────────────────────────┤
│ BN ▶ Redmi, Redmi Note & Poco Mainstream / Budget Series │
│ (e.g., BN57, BN59, BN60, BN5A, BN53, BN56, BN62) │
│ │
│ BM ▶ Xiaomi Digital Flagship, Mi Mix & K-Series Flagship Lines │
│ (e.g., BM4Y, BM57, BM58, BM4X, BM54, BM3L) │
│ │
│ BP ▶ Specialized Poco Performance & Black Shark Gaming Hardware │
│ (e.g., BP42, BP41) │
│ │
│ BW ▶ Xiaomi Ultra, Foldables & Dual-Cell Series Architecture │
│ (e.g., BW50, BW54) │
└────────────────────────────────────────────────────────────────────────┘
1. Decoding the 4-Character Code
Unlike Huawei, Xiaomi's numeric digits do not represent physical measurements. Instead, they represent sequential platform release codes: - **`BN57`**: 5,160 mAh (3.87V nominal, 4.45V max, 33W MMT fast charging). 100% interchangeable between the [Poco X3 NFC and Poco X3 Pro](https://getpartify.app/blog/xiaomi/poco-x3-pro-vs-poco-x3-nfc-parts-compatibility). - **`BN59`**: 5,000 mAh (3.87V nominal, 4.45V max). Cross-compatible across the [Redmi Note 10, Redmi Note 10S](https://getpartify.app/blog/xiaomi/redmi-note-10-vs-note-10s-parts-compatibility), and Poco M5s. - **`BN60`**: 6,000 mAh large-capacity pouch engineered for the Redmi 9T and Poco M3. - **`BM4Y`**: 4,700 mAh flagship cell used in the Poco F2 Pro and Redmi K30 Pro. - **`BM58`**: 4,600 mAh dual-tab fast-charging cell engineered for the Xiaomi 12 Pro (120W HyperCharge).2. Cross-Model Donor Power in Xiaomi Families
Because Xiaomi frequently rebrands hardware across regional lines, a single `BN` or `BM` battery often powers multiple smartphones:| Xiaomi Battery Code | Rated Capacity | Nominal / Max Voltage | Fully Compatible Donor Models |
|---|---|---|---|
BN57 |
5,060 mAh (Typ 5,160) | 3.87V / 4.45V | Poco X3, Poco X3 NFC, Poco X3 Pro |
BN59 |
4,900 mAh (Typ 5,000) | 3.87V / 4.45V | Redmi Note 10 (4G), Redmi Note 10S, Poco M5s |
BN53 |
4,920 mAh (Typ 5,020) | 3.87V / 4.45V | Redmi Note 9 Pro, Redmi Note 9S, Poco M2 Pro |
BN56 |
4,900 mAh (Typ 5,000) | 3.85V / 4.40V | Redmi 9A, Redmi 9C, Redmi 10A, Poco C31 |
BM4X |
4,920 mAh (Typ 5,000) | 3.87V / 4.45V | Xiaomi Mi 10T, Mi 10T Pro, Redmi K30S |
BM54 |
4,150 mAh (Typ 4,250) | 3.87V / 4.45V | Xiaomi Mi 11 Lite 4G, Mi 11 Lite 5G, 11 Lite 5G NE |
Huawei & Honor Battery Codes: The Ingenious Dimensional `HB` Formula
Huawei features the most elegant and mathematically transparent battery part-numbering system in the consumer electronics industry. The model code literally encodes the physical dimensions of the cell pouch in tenths of a millimeter!
┌────────────────────────────────────────────────────────────────────────┐
│ HUAWEI DIMENSIONAL HB FORMULA DECODER │
├────────────────────────────────────────────────────────────────────────┤
│ │
│ HB 36 64 81 ECW │
│ ── ── ── ── ─── │
│ │ │ │ │ └── Revision & Packaging Variant │
│ │ │ │ └─────── Cell Length / Height: 81 mm │
│ │ │ └──────────── Cell Width: 64 mm │
│ │ └───────────────── Cell Thickness: 3.6 mm (0.36 cm) │
│ └────────────────────── Huawei Battery Prefix │
│ │
└────────────────────────────────────────────────────────────────────────┘
1. The Mathematical Dimensional Formula: `HB[TT][WW][LL]`
- **`HB`**: Huawei Battery identifier. - **`TT` (Thickness)**: Thickness in tenths of a millimeter (e.g., `36` = **3.6 mm**; `40` = **4.0 mm**; `43` = **4.3 mm**). - **`WW` (Width)**: Width in full millimeters (e.g., `64` = **64 mm**; `59` = **59 mm**; `66` = **66 mm**). - **`LL` (Length/Height)**: Length in full millimeters (e.g., `81` = **81 mm**; `79` = **79 mm**; `86` = **86 mm**).2. Dissecting the Universal `HB366481ECW` (15+ Donor Phones)
The most famous example is **`HB366481ECW`**: - **Dimensions**: 3.6 mm thick × 64 mm wide × 81 mm long. - **Electrical Specs**: 2,900 mAh rated / 3,000 mAh typical, 3.82V nominal, 4.40V max cut-off. - **Donor Compatibility**: Powers over 15 distinct devices across Huawei and pre-separation Honor lines, including: - Huawei P9 (`EVA-L09`), P9 Lite (`VNS-L31`), P10 Lite (`WAS-LX1`), P20 Lite (`ANE-LX1`). - Honor 8 (`FRD-L09`), Honor 9 Lite (`LLD-L31`), Honor 5C (`NEM-L51`), Honor 7C (`AUM-L41`), Honor 8A (`JAT-LX1`). - Check the full [Huawei HB366481ECW Battery Compatibility Guide](https://getpartify.app/blog/huawei/huawei-hb366481ecw-battery-compatibility-list).3. Other Common Huawei Dimensional Codes
- **`HB405979ECW`**: - `40` = 4.0 mm thick | `59` = 59 mm wide | `79` = 79 mm long. - 3,020 mAh cell used in Huawei Nova, Y5 (2017/2018), Y6 (2017/2018), Honor 6A, Honor 6C, and Honor 7S. - **`HB436486ECW`**: - `43` = 4.3 mm thick | `64` = 64 mm wide | `86` = 86 mm long. - 4,000 mAh high-capacity cell used in Huawei Mate 10, Mate 10 Pro, Mate 20, and P20 Pro. - **`HB396689ECW`**: - `3.9 mm` thick × `66 mm` wide × `89 mm` long. - 4,200 mAh 40W SuperCharge cell used in Huawei P30 Pro and Mate 20 Pro.4. Suffix Variations: `ECW`, `EBC`, `EAW`, `EFW`
The 3-letter suffix denotes the Protection Circuit Module (PCM) supplier and flex orientation: - `ECW`: Standard consumer replacement pouch with high-voltage 4.40V cut-off (Sunwoda / Amperex Technology Limited packaging). - `EAW` vs `EBW`: Minor differences in the FPC ribbon fold direction or thermistor calibration curve. Always verify that the FPC flex tail reaches the motherboard battery header without excessive tension.Apple iPhone Battery Codes: `A-Numbers`, APN Part Codes & Serialized BMS Chips
Apple does not design batteries for cross-model interchangeability. However, reading Apple battery labels is essential for authenticating genuine OEM cells and diagnosing non-genuine battery alerts.
┌────────────────────────────────────────────────────────────────────────┐
│ APPLE BATTERY LABELS & SERIALIZATION │
├────────────────────────────────────────────────────────────────────────┤
│ 1. APPLE MODEL NUMBER (A-NUMBER) │
│ ▶ Format: A followed by 4 digits (e.g., A2655, A2479, A2176) │
│ ▶ Identifies the exact physical battery form-factor & capacity │
│ │
│ 2. APPLE PART NUMBER (APN) │
│ ▶ Format: 616-XXXX or 616-XXXX-XX (e.g., 616-00659) │
│ ▶ Identifies the cell supplier (ATL, Desay, Sunwoda, Simplo) │
│ │
│ 3. BMS CRYPTOGRAPHIC HANDSHAKE │
│ ▶ Texas Instruments BQ27z561 Gas Gauge IC paired to Logic Board │
│ ▶ Prevents inter-model swapping even with identical dimensions │
└────────────────────────────────────────────────────────────────────────┘
1. Apple Model Numbers (`A-Numbers`)
Printed in bold laser etching directly on the black protective wrapper: - **`A2655`**: iPhone 13 Pro Max (4,352 mAh, 16.75 Wh, 3.85V). - **`A2479`**: iPhone 12 Pro Max (3,687 mAh, 14.13 Wh, 3.83V). - **`A2866`**: iPhone 14 (3,279 mAh, 12.68 Wh, 3.87V). - **`A3090`**: iPhone 15 Pro (3,274 mAh, 12.70 Wh, 3.87V).2. Apple Part Numbers (APN `616-XXXX`)
The APN code identifies the contract cell manufacturer: - `616-00659` (iPhone 11 - Amperex Technology Limited / ATL). - `616-00778` (iPhone 12 - Desay Corporation). - `616-00840` (iPhone 13 - Sunwoda Electronic Co.).Important: Multiple APNs exist for the same iPhone model because Apple multi-sources cells from ATL, Desay, and Sunwoda. All official APNs assigned to a specific iPhone model are 100% interchangeable within that model.
3. Why Apple Batteries Do Not Cross-Swap
Even when two iPhone models have nearly identical capacities (e.g., iPhone 13 at 3,227 mAh vs. iPhone 14 at 3,279 mAh), Apple batteries **cannot be swapped**: 1. **FPC Connector Header Pitch**: Apple alters the pinout, pitch, and latch bracket geometry between generations. 2. **Encrypted Gas Gauge Authentication**: The BMS board houses a proprietary Texas Instruments gas gauge IC storing cryptographic public/private keys paired to the phone's Secure Enclave. Swapping an unprogrammed cell triggers the iOS *"Important Battery Message: Unable to verify this iPhone has a genuine Apple battery"* alert and disables Battery Health percentage reporting.BBK Group Battery Codes: Oppo, Realme, OnePlus (`BLP`) & Vivo (`B-`)
The BBK Electronics manufacturing conglomerate (Oppo, OnePlus, Realme, and Vivo) represents the industry standard for ultra-fast charging architectures (65W, 80W, 100W, and 150W SuperVOOC / Warp Charge).
┌────────────────────────────────────────────────────────────────────────┐
│ BBK GROUP BATTERY CODING │
├────────────────────────────────────────────────────────────────────────┤
│ OPPO / ONEPLUS / REALME ▶ BLP + 3 or 4 Digits │
│ e.g., BLP673 (OnePlus 6) │
│ BLP805 (OnePlus 8T - Dual-Cell 7.74V) │
│ BLP907 (Realme GT Neo 3) │
│ │
│ VIVO / iQOO ▶ B- + Letter/Number Platform Designator │
│ e.g., B-O6, B-S7, B-T2, B-K3 │
└────────────────────────────────────────────────────────────────────────┘
1. Decoding `BLP` Codes across Oppo, OnePlus & Realme
The `BLP` prefix (Battery Lithium Polymer) is followed by a 3-digit or 4-digit sequential platform number: - **`BLP673`**: 3,300 mAh (3.85V nominal, 4.40V max) used in the OnePlus 6. - **`BLP743`**: 3,800 mAh (3.87V nominal, 4.45V max) used in the OnePlus 7T. - **`BLP907`**: 5,000 mAh (3.87V nominal, 4.45V max) used in the Realme GT Neo 3 and Oppo Reno8 Pro.2. Single-Cell vs. Dual-Cell Series Batteries (7.74V Architecture)
To achieve charging speeds exceeding 65W without generating excessive heat or requiring impossibly thick cables, BBK introduced **dual-cell series battery packs**: - On single-cell batteries, nominal voltage is **3.85V–3.87V**. - On dual-cell batteries (such as **`BLP805`** for OnePlus 8T or **`BLP885`** for OnePlus 9/9 Pro), the label reads: - `Nominal Voltage: 7.74V (2 × 3.87V)` - `Charge Cut-Off: 8.90V (2 × 4.45V)` - `Rated Capacity: 2 × 2200 mAh = 4400 mAh`⚠️ Technician Alert: Dual-cell
BLPbatteries feature dual-trace FPC connectors that route charging current to two independent cells simultaneously. You cannot test or charge these cells with standard single-cell 4.2V bench power supply leads without blowing the onboard balancing circuit.
Master Manufacturer Battery Code Syntax Reference Matrix
This reference matrix summarizes the syntax rules and donor characteristics across all major smartphone brands:
| Brand / Family | Primary Prefix | Format Syntax | Example Model Code | Decoded Meaning | Cross-Model Reusability |
|---|---|---|---|---|---|
| Samsung | EB-B |
EB-B[Model][Suffix] |
EB-BG781ABY |
Galaxy S20 FE base design; Pouch format; Rev A; Global assembly | High (Reused across Galaxy S, A & M families) |
| Samsung (ODM) | HQ- / WT- |
[Prefix]-[Number] |
HQ-50S |
5,000 mAh ODM unified budget cell (GH82-24317A) | Very High (A12, A02s, A03s, M12, M02) |
| Xiaomi / Redmi | BN |
BN[Number/Alphanumeric] |
BN59 |
Redmi/Poco budget-mainstream 5,000 mAh platform cell | High (Note 10, Note 10S, Poco M5s) |
| Xiaomi (Flagship) | BM |
BM[Number/Alphanumeric] |
BM4Y |
Mi / Digital Flagship 4,700 mAh platform cell | Medium (Mi 10, K30 Pro, Poco F2 Pro) |
| Huawei / Honor | HB |
HB[TT][WW][LL][Suffix] |
HB366481ECW |
3.6mm thick × 64mm wide × 81mm long (3,000 mAh) | Extremely High (15+ Huawei/Honor models) |
| Apple iPhone | A-Number |
A[4 Digits] |
A2655 |
iPhone 13 Pro Max form-factor & capacity specification | None (Locked to specific iPhone model) |
| Apple (Supplier) | APN |
616-[5 Digits] |
616-00659 |
ATL factory production lot code for iPhone 11 | High (All APNs for same model swap) |
| Oppo / OnePlus | BLP |
BLP[3-4 Digits] |
BLP805 |
4,500 mAh dual-cell 7.74V pack for 65W SuperVOOC | Medium (Swaps across Oppo & OnePlus sister phones) |
| Vivo / iQOO | B- |
B-[Letter/Number] |
B-S7 |
Vivo S-series unified platform battery pack | Medium (Swaps across Vivo & iQOO models) |
Technician Bench Rules: Verifying Unknown Batteries Before Installation
When encountering an unlabeled, pull-harvested, or unverified replacement battery, follow this 4-step bench triage protocol before connecting it to a customer's logic board:
┌────────────────────────────────────────────────────────────────────────┐
│ 4-STEP BENCH BATTERY VERIFICATION PROTOCOL │
├────────────────────────────────────────────────────────────────────────┤
│ STEP 1: DIGITAL CALIPER MEASUREMENT │
│ Measure Length (X), Width (Y), and Thickness (Z). Allow 0.5mm │
│ clearance for 8-10% natural LiPo pouch cycle expansion. │
│ │
│ STEP 2: MULTIMETER VOLTAGE & POLARITY CHECK │
│ Verify resting voltage is between 3.7V and 4.2V. Ensure positive │
│ (VBAT+) and ground (GND) pinouts match the motherboard socket. │
│ │
│ STEP 3: NTC THERMISTOR RESISTANCE TEST │
│ Measure resistance between GND and the NTC/BSI pad: │
│ ▶ Samsung / Xiaomi / Huawei: ~10 kΩ at 25°C room temperature │
│ ▶ Motorola / Sony: ~47 kΩ at 25°C room temperature │
│ │
│ STEP 4: VOLTAGE CUT-OFF COMPATIBILITY │
│ Check motherboard PMIC target charging voltage. Never install a 4.35V │
│ cell into a 4.45V fast-charging phone. │
└────────────────────────────────────────────────────────────────────────┘
- Digital Caliper Dimensions: Never force a battery into the chassis well. LiPo pouch cells expand by 8% to 10% over 500 charge cycles. A zero-clearance fit will cause screen pressure spots and digitizer phantom touches over time.
- Polarity Verification: Always check FPC pinouts with a digital multimeter. Reverse-polarity insertion will instantly destroy the motherboard's input protection diode and primary PMIC.
- NTC Thermistor Measurement: Connect multimeter probes between ground and the thermal sense line. If the reading is not ~10 kΩ (or ~47 kΩ for Motorola), the phone will refuse to charge, throwing a "Battery Temperature Too Cold/Hot" error.
- PMIC Voltage Matching: Confirm that the battery's limited charge voltage rating equals or exceeds the phone's charging controller specification.
Frequently Asked Questions (FAQ)
What does `EB-B` mean on a Samsung battery?
`EB-B` is Samsung's official prefix for **Electronic Battery - Built-in Pouch**. The characters following `EB-B` correspond to the base model number of the smartphone the cell was originally developed for (e.g., `EB-BG781ABY` was engineered for the Galaxy S20 FE `SM-G781`).How does Huawei's battery model numbering indicate size?
Huawei's `HB` part numbers encode the cell's physical dimensions in tenths of a millimeter using the formula `HB[TT][WW][LL]`. For example, in **`HB366481ECW`**, `36` indicates a thickness of **3.6 mm**, `64` indicates a width of **64 mm**, and `81` indicates a length of **81 mm**.Can I install an iPhone battery with a different `APN` number?
Yes, as long as the Apple Model Number (`A-Number`) matches your iPhone model. Apple sources battery cells from multiple certified manufacturers (ATL, Desay, Sunwoda), resulting in multiple valid `616-XXXX` APN numbers for the exact same device.How do I know which phones use the same Xiaomi `BN` battery?
Xiaomi re-uses platform batteries across multiple devices within its Redmi, Poco, and Xiaomi lines. For instance, the **`BN59`** battery powers the Redmi Note 10 (4G), Redmi Note 10S, and Poco M5s, while the **`BN57`** battery powers both the Poco X3 NFC and Poco X3 Pro. You can search any `BN` or `BM` code directly in the [Partify Hardware Database](https://getpartify.app/compare) to see all compatible models.What happens if I install a 4.35V battery into a 4.45V fast-charging phone?
The phone's charging management IC will attempt to charge the cell up to 4.45V. Because standard cells are only chemically rated for 4.35V, this 100mV continuous overcharge degrades the cathode, rapidly decomposes electrolyte fluids, causes heavy pouch gas swelling within weeks, and creates an extreme fire hazard.Find Compatible Donor Batteries & Verify Specs on Partify
Never guess battery compatibility on the repair bench. Use Partify's professional hardware tools to search thousands of verified OEM battery part numbers, cross-reference donor models, and verify exact electrical specifications:
- Partify Smartphone Hardware Comparison Engine: Compare battery dimensions, voltage cut-offs, and FPC connector pinouts side-by-side.
- Samsung Hardware Directory: Cross-reference
EB-Bseries andGH82Service Pack numbers across all Galaxy generations. - Xiaomi Parts Directory: Look up complete donor lists for every Xiaomi, Redmi, and Poco
BN,BM, andBPbattery. - Huawei Parts Directory: Calculate cell dimensions and discover cross-compatible models using the dimensional
HBformula. - Smartphone Power Management & Charging ICs: Source verified charging ICs, PMICs, and battery protection circuits for motherboard-level repair.