Custom Li-polymer Battery Packs Manufacturer & Supplier
Standard battery sizes shouldn’t dictate your product design. At Balder Power, we engineer and supply Custom Li-polymer Battery Packs built strictly to your physical constraints and power profiles. Leveraging the extreme form-factor flexibility of LiPo technology, we help you maximize battery capacity in tight, non-standard device cavities.
Optimized Supply Chain: Leverage our integrated manufacturing and sourcing network to achieve highly competitive BOM costs.
Rapid Prototyping: Custom physical dimensions and capacity testing within 15 days.
Strict Cell Grading: We only use Grade-A cells to guarantee consistent discharge rates and cycle life.
Complete OEM/ODM Lithium Polymer Solutions
Off-the-shelf batteries rarely fit innovative product designs. Our engineering team builds your Custom Li-polymer Battery Packs from the ground up. Whether you need an ultra-thin 2mm profile for a wearable or a complex multi-cell configuration, we handle the entire tooling and assembly process.
Smart BMS Integration: We design custom BMS (Battery Management System) logic to protect against overcharge, over-discharge, and short circuits, matched perfectly to your device’s draw.
Flexible Footprints: No rigid metal casings. We formulate the polymer pouch to fit the exact cavities of your hardware.
Terminal & Wire Harness: Custom cable lengths, AWG gauges, and specialized connectors (JST, Molex, etc.) ready for immediate plug-and-play assembly.
Standard Li-polymer Cell Models & Specifications Reference
To accelerate your product development and eliminate custom tooling costs, we maintain a vast library of existing Li-polymer cell molds. Below is a searchable selection of our most common cell dimensions and capacities.
| LiPo Cell Model | Capacity (mAh) | Thickness (mm) | Width (mm) | Length (mm) | Voltage (V) |
|---|---|---|---|---|---|
| 301020 | 40 | 3.0±0.2 | 10.0±0.5 | 20.0±2.0 | 3.7 |
| 401020 | 55 | 4.0±0.2 | 10.0±0.5 | 20.0±2.0 | 3.7 |
| 301030 | 70 | 3.0±0.2 | 10.0±0.5 | 30.0±2.0 | 3.7 |
| 401030 | 90 | 4.0±0.2 | 10.0±0.5 | 30.0±2.0 | 3.7 |
| 301120 | 45 | 3.0±0.2 | 11.0±0.5 | 20.0±2.0 | 3.7 |
| 401120 | 60 | 4.0±0.2 | 11.0±0.5 | 20.0±2.0 | 3.7 |
| 301130 | 75 | 3.0±0.2 | 11.0±0.5 | 30.0±2.0 | 3.7 |
| 401215 | 55 | 4.0±0.2 | 12.0±0.5 | 15.0±2.0 | 3.7 |
| 301220 | 50 | 3.0±0.2 | 12.0±0.5 | 20.0±2.0 | 3.7 |
| 401220 | 70 | 4.0±0.2 | 12.0±0.5 | 20.0±2.0 | 3.7 |
| 301225 | 65 | 3.0±0.2 | 12.0±0.5 | 25.0±2.0 | 3.7 |
| 401225 | 85 | 4.0±0.2 | 12.0±0.5 | 25.0±2.0 | 3.7 |
| 301230 | 80 | 3.0±0.2 | 12.0±0.5 | 30.0±2.0 | 3.7 |
| 401230 | 110 | 4.0±0.2 | 12.0±0.5 | 30.0±2.0 | 3.7 |
| 501230 | 130 | 5.0±0.2 | 12.0±0.5 | 30.0±2.0 | 3.7 |
| 601230 | 160 | 6.0±0.2 | 12.0±0.5 | 30.0±2.0 | 3.7 |
| 301235 | 90 | 3.0±0.2 | 12.0±0.5 | 35.0±2.0 | 3.7 |
| 401235 | 120 | 4.0±0.2 | 12.0±0.5 | 35.0±2.0 | 3.7 |
| 501235 | 160 | 5.0±0.2 | 12.0±0.5 | 35.0±2.0 | 3.7 |
| 601235 | 190 | 6.0±0.2 | 12.0±0.5 | 35.0±2.0 | 3.7 |
| 301240 | 100 | 3.0±0.2 | 12.0±0.5 | 40.0±2.0 | 3.7 |
| 401240 | 150 | 4.0±0.2 | 12.0±0.5 | 40.0±2.0 | 3.7 |
| 501240 | 190 | 5.0±0.2 | 12.0±0.5 | 40.0±2.0 | 3.7 |
| 601240 | 230 | 6.0±0.2 | 12.0±0.5 | 40.0±2.0 | 3.7 |
| 501245 | 230 | 5.0±0.2 | 12.0±0.5 | 45.0±2.0 | 3.7 |
| 301420 | 60 | 3.0±0.2 | 14.0±0.5 | 20.0±2.0 | 3.7 |
| 401420 | 80 | 4.0±0.2 | 14.0±0.5 | 20.0±2.0 | 3.7 |
| 501420 | 100 | 5.0±0.2 | 14.0±0.5 | 20.0±2.0 | 3.7 |
| 601420 | 120 | 6.0±0.2 | 14.0±0.5 | 20.0±2.0 | 3.7 |
| 301525 | 90 | 3.0±0.2 | 15.0±0.5 | 25.0±2.0 | 3.7 |
| 401525 | 130 | 4.0±0.2 | 15.0±0.5 | 25.0±2.0 | 3.7 |
| 501525 | 160 | 5.0±0.2 | 15.0±0.5 | 25.0±2.0 | 3.7 |
| 601525 | 200 | 6.0±0.2 | 15.0±0.5 | 25.0±2.0 | 3.7 |
| 301530 | 110 | 3.0±0.2 | 15.0±0.5 | 30.0±2.0 | 3.7 |
| 401530 | 150 | 4.0±0.2 | 15.0±0.5 | 30.0±2.0 | 3.7 |
| 501530 | 190 | 5.0±0.2 | 15.0±0.5 | 30.0±2.0 | 3.7 |
| 601530 | 230 | 6.0±0.2 | 15.0±0.5 | 30.0±2.0 | 3.7 |
| 301540 | 150 | 3.0±0.2 | 15.0±0.5 | 40.0±2.0 | 3.7 |
| 401540 | 200 | 4.0±0.2 | 15.0±0.5 | 40.0±2.0 | 3.7 |
| 501540 | 260 | 5.0±0.2 | 15.0±0.5 | 40.0±2.0 | 3.7 |
| 601540 | 320 | 6.0±0.2 | 15.0±0.5 | 40.0±2.0 | 3.7 |
| 302020 | 90 | 3.0±0.2 | 20.0±0.5 | 20.0±2.0 | 3.7 |
| 402020 | 120 | 4.0±0.2 | 20.0±0.5 | 20.0±2.0 | 3.7 |
| 502020 | 160 | 5.0±0.2 | 20.0±0.5 | 20.0±2.0 | 3.7 |
| 602020 | 200 | 6.0±0.2 | 20.0±0.5 | 20.0±2.0 | 3.7 |
| 302025 | 110 | 3.0±0.2 | 20.0±0.5 | 25.0±2.0 | 3.7 |
| 402025 | 160 | 4.0±0.2 | 20.0±0.5 | 25.0±2.0 | 3.7 |
| 502025 | 200 | 5.0±0.2 | 20.0±0.5 | 25.0±2.0 | 3.7 |
| 602025 | 250 | 6.0±0.2 | 20.0±0.5 | 25.0±2.0 | 3.7 |
| 302030 | 140 | 3.0±0.2 | 20.0±0.5 | 30.0±2.0 | 3.7 |
| 402030 | 190 | 4.0±0.2 | 20.0±0.5 | 30.0±2.0 | 3.7 |
| 502030 | 250 | 5.0±0.2 | 20.0±0.5 | 30.0±2.0 | 3.7 |
| 602030 | 300 | 6.0±0.2 | 20.0±0.5 | 30.0±2.0 | 3.7 |
| 302035 | 160 | 3.0±0.2 | 20.0±0.5 | 35.0±2.0 | 3.7 |
| 402035 | 230 | 4.0±0.2 | 20.0±0.5 | 35.0±2.0 | 3.7 |
| 502035 | 290 | 5.0±0.2 | 20.0±0.5 | 35.0±2.0 | 3.7 |
| 602035 | 360 | 6.0±0.2 | 20.0±0.5 | 35.0±2.0 | 3.7 |
| 302040 | 190 | 3.0±0.2 | 20.0±0.5 | 40.0±2.0 | 3.7 |
| 402040 | 260 | 4.0±0.2 | 20.0±0.5 | 40.0±2.0 | 3.7 |
| 502040 | 340 | 5.0±0.2 | 20.0±0.5 | 40.0±2.0 | 3.7 |
| 602040 | 420 | 6.0±0.2 | 20.0±0.5 | 40.0±2.0 | 3.7 |
| 302050 | 250 | 3.0±0.2 | 20.0±0.5 | 50.0±2.0 | 3.7 |
| 402050 | 340 | 4.0±0.2 | 20.0±0.5 | 50.0±2.0 | 3.7 |
| 502050 | 450 | 5.0±0.2 | 20.0±0.5 | 50.0±2.0 | 3.7 |
| 602050 | 550 | 6.0±0.2 | 20.0±0.5 | 50.0±2.0 | 3.7 |
| 302525 | 140 | 3.0±0.2 | 25.0±0.5 | 25.0±2.0 | 3.7 |
| 402525 | 200 | 4.0±0.2 | 25.0±0.5 | 25.0±2.0 | 3.7 |
| 502525 | 260 | 5.0±0.2 | 25.0±0.5 | 25.0±2.0 | 3.7 |
| 602525 | 320 | 6.0±0.2 | 25.0±0.5 | 25.0±2.0 | 3.7 |
| 302530 | 180 | 3.0±0.2 | 25.0±0.5 | 30.0±2.0 | 3.7 |
| 402530 | 250 | 4.0±0.2 | 25.0±0.5 | 30.0±2.0 | 3.7 |
| 502530 | 320 | 5.0±0.2 | 25.0±0.5 | 30.0±2.0 | 3.7 |
| 602530 | 400 | 6.0±0.2 | 25.0±0.5 | 30.0±2.0 | 3.7 |
| 302535 | 210 | 3.0±0.2 | 25.0±0.5 | 35.0±2.0 | 3.7 |
| 402535 | 300 | 4.0±0.2 | 25.0±0.5 | 35.0±2.0 | 3.7 |
| 502535 | 380 | 5.0±0.2 | 25.0±0.5 | 35.0±2.0 | 3.7 |
| 602535 | 480 | 6.0±0.2 | 25.0±0.5 | 35.0±2.0 | 3.7 |
| 302540 | 240 | 3.0±0.2 | 25.0±0.5 | 40.0±2.0 | 3.7 |
| 402540 | 350 | 4.0±0.2 | 25.0±0.5 | 40.0±2.0 | 3.7 |
| 502540 | 450 | 5.0±0.2 | 25.0±0.5 | 40.0±2.0 | 3.7 |
| 602540 | 550 | 6.0±0.2 | 25.0±0.5 | 40.0±2.0 | 3.7 |
| 303030 | 220 | 3.0±0.2 | 30.0±0.5 | 30.0±2.0 | 3.7 |
| 403030 | 310 | 4.0±0.2 | 30.0±0.5 | 30.0±2.0 | 3.7 |
| 503030 | 400 | 5.0±0.2 | 30.0±0.5 | 30.0±2.0 | 3.7 |
| 603030 | 500 | 6.0±0.2 | 30.0±0.5 | 30.0±2.0 | 3.7 |
| 303035 | 260 | 3.0±0.2 | 30.0±0.5 | 35.0±2.0 | 3.7 |
| 403035 | 370 | 4.0±0.2 | 30.0±0.5 | 35.0±2.0 | 3.7 |
| 503035 | 480 | 5.0±0.2 | 30.0±0.5 | 35.0±2.0 | 3.7 |
| 603035 | 600 | 6.0±0.2 | 30.0±0.5 | 35.0±2.0 | 3.7 |
| 303040 | 310 | 3.0±0.2 | 30.0±0.5 | 40.0±2.0 | 3.7 |
| 403040 | 430 | 4.0±0.2 | 30.0±0.5 | 40.0±2.0 | 3.7 |
| 503040 | 550 | 5.0±0.2 | 30.0±0.5 | 40.0±2.0 | 3.7 |
| 603040 | 700 | 6.0±0.2 | 30.0±0.5 | 40.0±2.0 | 3.7 |
| 303535 | 310 | 3.0±0.2 | 35.0±0.5 | 35.0±2.0 | 3.7 |
| 403535 | 430 | 4.0±0.2 | 35.0±0.5 | 35.0±2.0 | 3.7 |
| 503535 | 560 | 5.0±0.2 | 35.0±0.5 | 35.0±2.0 | 3.7 |
| 603535 | 700 | 6.0±0.2 | 35.0±0.5 | 35.0±2.0 | 3.7 |
| 303540 | 360 | 3.0±0.2 | 35.0±0.5 | 40.0±2.0 | 3.7 |
| 403540 | 500 | 4.0±0.2 | 35.0±0.5 | 40.0±2.0 | 3.7 |
| 503540 | 650 | 5.0±0.2 | 35.0±0.5 | 40.0±2.0 | 3.7 |
| 603540 | 800 | 6.0±0.2 | 35.0±0.5 | 40.0±2.0 | 3.7 |
| 304040 | 420 | 3.0±0.2 | 40.0±0.5 | 40.0±2.0 | 3.7 |
| 404040 | 550 | 4.0±0.2 | 40.0±0.5 | 40.0±2.0 | 3.7 |
| 504040 | 700 | 5.0±0.2 | 40.0±0.5 | 40.0±2.0 | 3.7 |
| 604040 | 850 | 6.0±0.2 | 40.0±0.5 | 40.0±2.0 | 3.7 |
| 304045 | 480 | 3.0±0.2 | 40.0±0.5 | 45.0±2.0 | 3.7 |
| 404045 | 650 | 4.0±0.2 | 40.0±0.5 | 45.0±2.0 | 3.7 |
| 504045 | 850 | 5.0±0.2 | 40.0±0.5 | 45.0±2.0 | 3.7 |
| 604045 | 1000 | 6.0±0.2 | 40.0±0.5 | 45.0±2.0 | 3.7 |
| 304050 | 550 | 3.0±0.2 | 40.0±0.5 | 50.0±2.0 | 3.7 |
| 404050 | 750 | 4.0±0.2 | 40.0±0.5 | 50.0±2.0 | 3.7 |
Can’t find the exact fit? This table only represents a fraction of our capabilities. We specialize in customizing cell footprints and chemistries to maximize the power density within your device’s specific cavity. contact our engineering team directly for a custom solution.
Target Applications
Our wholesale rechargeable LiPo batteries are trusted by hardware developers across multiple demanding sectors. The high energy density makes them ideal for:
Medical & Healthcare: Portable monitors, infusion pumps, and hearing aids requiring stable, interference-free power.
IoT & Smart Home: Sensor nodes, smart locks, and tracking devices needing low self-discharge and reliable longevity.
Consumer Tech: Handheld gaming consoles, premium audio gear, and ultra-thin laptops.
Light EV & Drones: High C-rate discharge LiPo packs engineered specifically for UAVs and robotics.
Solving the "Swelling" Problem with Strict QC
We know that battery swelling is the biggest headache for LiPo procurement. At Balder Power, our Custom Li-polymer Battery Packs undergo rigorous quality control to ensure mechanical stability and safety under extreme conditions.
Moisture Control: Assembled in strict low-humidity cleanrooms to prevent internal gas generation.
Aging & Cycle Testing: 100% of our packs go through thorough charge/discharge aging tests before shipping.
Global Certifications: Our cells and packs meet international compliance standards, including UL 1642, CE, RoHS, and UN38.3 for safe transit.
What is the minimum order quantity (MOQ) for custom Li-polymer battery packs? A: As a direct manufacturer, Balder Power offers flexible MOQs. For standard custom sizes, our MOQ typically starts at 500 units. However, we support smaller batch orders for pilot runs and R&D testing. Contact us to discuss your specific project needs.
A: Our engineering team moves fast. Once the technical specifications and dimensions are confirmed, standard custom Li-polymer prototypes are typically completed and ready for testing within 10 to 15 business days.
A: Battery swelling is usually caused by moisture during manufacturing or overcharging. We prevent this by assembling all cells in strictly controlled low-humidity cleanrooms, utilizing Grade-A materials, and integrating advanced BMS to prevent any over-voltage scenarios.
A: Yes. Our battery cells and assembled packs comply with major international safety standards. We can provide testing reports for UN38.3, MSDS, CE, and RoHS. We can also assist with specific UL certifications upon request.
A: Absolutely. Our electrical engineers can design custom Battery Management Systems tailored to your specific discharge rates, temperature thresholds, and communication protocols (like I2C or SMBus) to ensure maximum safety and performance.
A: We have years of experience exporting lithium batteries globally. We pack all shipments according to UN38.3 Class 9 regulations and partner with certified dangerous goods forwarders to offer reliable DDP (Delivered Duty Paid), sea freight, and air freight options.
