Why Choose ESC Galaxy S21 Ultra Battery?
Professional Samsung Battery Manufacturer
ESC is an experienced Samsung battery manufacturer serving repair chains, refurbishment facilities, mobile phone parts wholesalers, distributors and private label battery brands.
Professional research and development, automated production equipment and standardized inspection procedures support stable specifications, repeatable quality and reliable bulk purchasing.
Factory-Direct Wholesale Supply
Buying directly from a factory direct battery wholesaler gives professional buyers access to production, quality control, OEM customization, packaging and after-sales support.
ESC supports samples, single-model purchasing, mixed-model orders and long-term supply programs for international B2B customers.
Model-Specific EB-BG998ABY Design
The EB-BG998ABY battery is designed for Samsung Galaxy S21 Ultra 5G devices in the SM-G998 series.
Its physical dimensions, flex position, connector orientation and electrical parameters are designed for professional model-specific replacement.
5000mAh Rated Capacity
The Galaxy S21 Ultra battery has a listed capacity of 5000mAh and a standard voltage of 3.85V.
Professional buyers can request sample testing to verify measured capacity, charging performance, voltage stability and device compatibility before approving bulk production.
Brand-New Pure Cobalt Cell
The battery uses a brand-new pure cobalt lithium-ion cell designed for stable voltage output, controlled internal resistance and consistent charging and discharging performance.
Its listed cycle-life target is more than 800 charging cycles under suitable charging, storage and operating conditions.
Strict Quality Control
Quality inspections cover appearance, dimensions, voltage, internal resistance, capacity, charging performance, protection functions and self-discharge behavior.
Fully tested production and final inspection support a factory defect-rate target below 0.1% and a customer-reported defect rate below 1%.
PCM Protection Board
The integrated PCM board provides protection against overcharging, over-discharging and short circuits.
The flex connector and PCM are checked before shipment to help reduce installation failures and electrical abnormalities.
OEM Battery Factory Support
As an OEM battery factory, ESC supports customized battery labels, customer logos, retail boxes, barcode labels, instruction cards, warranty cards and export cartons.
Private label battery suppliers can develop model-specific product ranges for regional repair and distribution markets.
Flexible Wholesale MOQ
The single-model MOQ is 20 pieces. Mixed-model wholesale orders normally start from 100 pieces, depending on the selected products, packaging and customization requirements.
Samples can be evaluated before larger orders are confirmed.
Stable Production Lead Time
Standard products can normally be prepared within approximately seven days when materials and inventory are available.
Custom labels, private packaging and larger quantities may require additional production time.
Global Battery Shipping
Available shipping methods include DHL, UPS, air freight, sea freight, railway freight and road transportation.
The logistics route can be selected according to the destination, order quantity, required delivery date, customs requirements and transportation budget. ESC
Quick Specifications
| Specification | Details |
|---|---|
| Product Name | Samsung Galaxy S21 Ultra 5G Battery |
| Battery Model | EB-BG998ABY |
| Compatible Device | Samsung Galaxy S21 Ultra 5G |
| Compatible Series | SM-G998 Series |
| Battery Type | Rechargeable Lithium-Ion Battery |
| Cell Material | Brand-New Pure Cobalt Cell |
| Rated Capacity | 5000mAh |
| Standard Voltage | 3.85V |
| Product Configuration | Replacement Battery With Flex Connector and PCM |
| Protection Functions | Overcharge, Over-Discharge and Short-Circuit Protection |
| Cycle-Life Target | More Than 800 Charging Cycles |
| Charging Time | Approximately 1–3 Hours |
| Standby Time | Approximately 3–7 Days, Depending on Device Use |
| Working Temperature | -10°C to 50°C |
| Factory Defect-Rate Target | Below 0.1% |
| Customer-Reported Defect Rate | Below 1% |
| Standard Lead Time | Approximately 7 Days |
| Warranty | 12 Months |
| Single-Model MOQ | 20 Pieces |
| Mixed-Model MOQ | 100 Pieces |
| OEM Service | Custom Logo, Battery Label, Barcode and Private Packaging |
| Certifications | ISO 9001, CE, RoHS, FCC, IEC 62133, PSE, REACH, UL 2054, MSDS, UN38.3, KC and TISI |
| Express Shipping | DHL or UPS, Approximately 3–6 Days |
| Air Freight | Available According to Destination and Quantity |
| Sea Freight | Approximately 20–40 Days |
| Railway Freight | Approximately 30–35 Days |
| Road Transportation | Approximately 20–25 Days |
| Shipping Port | Shenzhen |
Certificate availability, production time, MOQ and transit time should be confirmed according to the selected production batch, destination, quantity and packaging requirements. ESC
What Is a Galaxy S21 Ultra Battery?
Product Definition
A Galaxy S21 Ultra battery is a 5000mAh, 3.85V lithium-ion replacement battery for professional repair and refurbishment. ESC is a Samsung battery manufacturer, phone battery supplier and OEM battery factory offering strict QC, private labels, bulk supply and global shipping.
This product is a compatible aftermarket replacement battery intended for professional B2B supply. It is not an original Samsung service part.
Key Features
1. Model-Specific EB-BG998ABY Configuration
The EB-BG998ABY design is developed for the battery compartment, connector position and electrical requirements of compatible Samsung Galaxy S21 Ultra 5G devices.
2. Rated 5000mAh Capacity
The battery provides a listed 5000mAh capacity and 3.85V standard voltage for professional Galaxy S21 Ultra battery replacement.
Actual runtime depends on measured capacity, phone condition, display brightness, mobile network activity, applications, charging habits and operating temperature.
3. Complete Replacement Configuration
The product includes a model-matched flex connector and PCM protection board rather than being supplied as a bare lithium-ion cell.
Professional technicians should verify the battery code, connector position and device model before installation.
4. More Than 800 Charging Cycles
The brand-new pure cobalt cell has a listed cycle-life target of more than 800 charging cycles under appropriate charging, storage and operating conditions.
5. OEM and Private Label Support
Custom logos, battery labels, retail boxes, barcode labels, instruction cards, warranty cards and export cartons are available for wholesale and private label orders. ESC
Compatible Samsung Galaxy Models
| Compatible Device | Model Number | Primary Market or Version |
|---|---|---|
| Samsung Galaxy S21 Ultra 5G | SM-G998B/DS | International Dual-SIM Version |
| Samsung Galaxy S21 Ultra 5G | SM-G998U | United States Carrier Version |
| Samsung Galaxy S21 Ultra 5G | SM-G998W | Canada Version |
| Samsung Galaxy S21 Ultra 5G | SM-G9980 | China Mainland, Hong Kong and Taiwan Version |
| Samsung Galaxy S21 Ultra 5G | Other SM-G998 Variants | Compatibility Subject to Battery-Code Verification |
The EB-BG998ABY battery is intended for the Samsung Galaxy S21 Ultra 5G platform. It is not interchangeable with batteries for the Galaxy S21, Galaxy S21 Plus or Galaxy S21 FE.
Buyers should confirm the phone model number, original battery code, dimensions, flex orientation and connector position before ordering. Samsung be
Applications
Mobile Phone Repair Shops
The Galaxy S21 Ultra battery is suitable for professional technicians replacing aged, damaged, swollen, fast-draining or low-capacity batteries.
Refurbishment Facilities
It supports batch refurbishment programs requiring model-specific batteries, consistent electrical specifications and stable repeat supply.
Samsung Parts Wholesalers
The product can be included in a wholesale replacement battery range for repair shops, service centers, technicians and regional distributors.
Repair Chain Stores
Centralized purchasing helps repair chains maintain standardized battery models, predictable inventory and consistent quality across multiple service locations.
Private Label Battery Brands
OEM customization enables battery brands to add customer logos, product labels, retail boxes, barcodes, instructions and warranty information.
E-Commerce Battery Sellers
The battery is suitable for online sellers requiring accurate compatibility details, retail-ready packaging and repeat wholesale supply.
International Distributors
Mixed-model purchasing, export documentation and multiple transportation methods support regional distribution and international wholesale programs.
ESC Replacement Battery vs Original Factory Battery
| Comparison Item | ESC Replacement Battery | Original Factory Battery |
|---|---|---|
| Product Type | Compatible aftermarket replacement battery | Factory-installed battery assembly |
| Compatible Device | Samsung Galaxy S21 Ultra 5G | Samsung Galaxy S21 Ultra 5G |
| Battery Reference | EB-BG998ABY | Original model-specific battery reference |
| Capacity | Listed 5000mAh | Model-specific original capacity |
| Standard Voltage | 3.85V | Original model-specific electrical specification |
| Battery Chemistry | Pure Cobalt Lithium-Ion Cell | Lithium-Ion Battery |
| Product Condition | Brand-New Replacement Battery | Brand-New When Originally Installed |
| Flex Connector | Model-Matched Replacement Flex | Original Factory Flex |
| Protection Board | PCM With Electrical Protection | Original Factory Protection System |
| Protection Functions | Overcharge, Over-Discharge and Short-Circuit Protection | Integrated Original Protection Functions |
| Installation Method | Professional Repair Installation Required | Installed During Manufacturing or Authorized Service |
| Device Compatibility | Confirmed by Model, Battery Code and Connector | Integrated With the Original Device |
| Branding | ESC, Neutral Label or Customized Private Label | Original Manufacturer Identification |
| Packaging | Standard Wholesale or Customized OEM Packaging | Original Service-Channel Packaging |
| Wholesale Availability | Available for Professional B2B Orders | Subject to Original Service-Channel Availability |
| OEM Labeling | Supported | Not Available for Third-Party Branding |
| Private Packaging | Supported | Not Available |
| Order Flexibility | Single-Model, Mixed-Model and Customized Orders | Limited by Official Service-Channel Policies |
| Single-Model MOQ | 20 Pieces | Generally Unavailable Through Flexible Wholesale |
| Warranty | 12-Month Supplier Warranty | Subject to Original Manufacturer Service Terms |
| Target Customers | Repair Shops, Refurbishers, Wholesalers and Distributors | Original Manufacturing and Authorized Service Networks |
| Cost Positioning | Competitive Professional Replacement Solution | Generally Positioned Within the Official Service Ecosystem |
Replacement-battery capacity, runtime, connector compatibility and charging performance should be verified through sample testing before bulk approval.
Quality Control Process
Incoming Cell Inspection
Incoming cells are checked for appearance, dimensions, voltage, internal resistance and material consistency before entering production.
Cell Grading
Cells are grouped according to measured capacity, voltage, internal resistance, thickness and self-discharge performance to improve batch consistency.
Capacity Verification
Professional battery analyzers are used to confirm whether measured capacity meets the approved 5000mAh product specification.
PCM Protection Testing
The PCM board is tested for overcharge, over-discharge and short-circuit protection according to the approved production procedure.
Flex and Connector Inspection
The flex cable, contact points and connector position are checked for alignment, appearance and electrical connection integrity.
Charging and Discharging Test
Charging and discharging performance is checked to identify abnormal current, unstable voltage, excessive temperature or early capacity loss.
Aging Inspection
Aging tests help identify abnormal self-discharge and unstable electrical performance before shipment.
Final Inspection
Battery appearance, dimensions, model information, flex position, labels, quantities and packaging are checked before order release. ESC
OEM and Private Label Service
Custom Battery Labels
Customer logos, battery codes, capacities, voltages, warning information, production batches and traceability codes can be printed on the label.
Private Label Packaging
Available options include individual retail boxes, protective trays, barcode labels, instruction cards and warranty cards.
Barcode and SKU Management
Customized model codes, SKU labels and barcodes help wholesalers manage multiple Samsung replacement battery products.
Mixed-Model Purchasing
Different Samsung, iPhone, Huawei, Xiaomi, OPPO, Vivo, tablet and laptop battery models can be combined according to confirmed quantities.
Export Carton Customization
Outer-carton labels, shipping marks, quantities, product models and customer branding can be customized for international shipments.
Ordering Information
Quotation Requirements
Provide the battery model, required quantity, destination country, packaging requirements, logo files, required certifications and preferred shipping method.
Sample Evaluation
Professional buyers can request samples to evaluate battery dimensions, flex position, connector orientation, measured capacity, voltage and charging performance.
Compatibility Confirmation
Confirm the phone model number, original battery reference EB-BG998ABY, battery dimensions and connector position before placing an order.
Bulk Production
Bulk production begins after the model, quantity, label artwork, packaging, payment terms and delivery requirements are confirmed.
Shipping Arrangement
The recommended shipping route is selected according to battery quantity, destination, customs requirements, delivery schedule and transportation budget.
FAQ
1. What is the capacity of the Galaxy S21 Ultra battery?
The replacement battery has a listed capacity of 5000mAh and a standard voltage of 3.85V.
Professional buyers can request samples to verify measured capacity, voltage stability and runtime before approving a bulk order.
2. What battery model is used for the Samsung Galaxy S21 Ultra 5G?
The applicable replacement battery reference is EB-BG998ABY.
Buyers should compare the original battery code, flex orientation and connector position before ordering.
3. Which phones are compatible with the EB-BG998ABY battery?
The battery is designed for Samsung Galaxy S21 Ultra 5G devices in the SM-G998 series.
It is not designed for the standard Galaxy S21, Galaxy S21 Plus or Galaxy S21 FE.
4. Does the battery include a flex connector and protection board?
Yes. The replacement configuration includes a model-matched flex connector and PCM protection board.
The PCM provides protection against overcharging, over-discharging and short circuits.
5. Is this an original Samsung battery?
No. It is a compatible aftermarket replacement battery manufactured for professional repair, refurbishment and wholesale markets.
It should not be described as an original Samsung service battery.
6. Who should install the Galaxy S21 Ultra battery?
Installation should be completed by a trained mobile phone repair technician using suitable tools and safe operating procedures.
The phone should be powered off, and the original battery should be disconnected before other internal components are handled.
7. What is the minimum order quantity?
The single-model MOQ is 20 pieces. Mixed-model wholesale orders normally start from 100 pieces.
Final quantities depend on the selected products, packaging and customization requirements.
8. Can ESC customize the battery label and packaging?
Yes. ESC supports custom logos, battery labels, retail boxes, barcode labels, instruction cards, warranty cards and export-carton markings.
9. How is the battery quality checked before shipment?
Typical inspections include appearance checking, voltage testing, internal-resistance measurement, capacity verification, PCM testing, flex inspection, charging and discharging tests, aging inspection and final packaging checks.
10. What warranty and shipping methods are available?
A 12-month supplier warranty is available for qualified product-quality issues.
Shipping options include DHL, UPS, air freight, sea freight, railway freight and road transportation. Delivery time depends on the destination, customs clearance and selected logistics route.
