THOR POWER · FACTORY-DIRECT
3.7V Lithium Polymer Batteries — Up to 500mAh
Factory-direct 3.7V LiPo batteries up to 500mAh for space-constrained designs where thickness, width and length decide the fit, with customizable sizes, connectors, wire harnesses and PCM/NTC protection.
Available Models
THOR-301020
3.7V · 40 mAh LiPo Battery
Nominal cell size: 3 × 10 × 20 mm
THOR-301120
3.7V · 40 mAh LiPo Battery
Nominal cell size: 3 × 11 × 20 mm
THOR-301525
3.7V · 50 mAh LiPo Battery
Nominal cell size: 3 × 15 × 25 mm
THOR-301025
3.7V · 50 mAh LiPo Battery
Nominal cell size: 3 × 10 × 25 mm
THOR-351020
3.7V · 55 mAh LiPo Battery
Nominal cell size: 3.5 × 10 × 20 mm
THOR-401020
3.7V · 55 mAh LiPo Battery
Nominal cell size: 4 × 10 × 20 mm
THOR-451220
3.7V · 70 mAh LiPo Battery
Nominal cell size: 4.5 × 12 × 20 mm
THOR-401220
3.7V · 70 mAh LiPo Battery
Nominal cell size: 4 × 12 × 20 mm
THOR-401025
3.7V · 70 mAh LiPo Battery
Nominal cell size: 4 × 10 × 25 mm
THOR-651417
3.7V · 75 mAh LiPo Battery
Nominal cell size: 6.5 × 14 × 17 mm
THOR-501120
3.7V · 75 mAh LiPo Battery
Nominal cell size: 5 × 11 × 20 mm
THOR-302022
3.7V · 80 mAh LiPo Battery
Nominal cell size: 3 × 20 × 22 mm
THOR-401225
3.7V · 90 mAh LiPo Battery
Nominal cell size: 4 × 12 × 25 mm
THOR-401130
3.7V · 90 mAh LiPo Battery
Nominal cell size: 4 × 11 × 30 mm
THOR-402020
3.7V · 100 mAh LiPo Battery
Nominal cell size: 4 × 20 × 20 mm
THOR-401129
3.7V · 100 mAh LiPo Battery
Nominal cell size: 4 × 11 × 29 mm
THOR-401230
3.7V · 100 mAh LiPo Battery
Nominal cell size: 4 × 12 × 30 mm
THOR-302020
3.7V · 100 mAh LiPo Battery
Nominal cell size: 3 × 20 × 20 mm
THOR-501125
3.7V · 100 mAh LiPo Battery
Nominal cell size: 5 × 11 × 25 mm
THOR-501520
3.7V · 100 mAh LiPo Battery
Nominal cell size: 5 × 15 × 20 mm
THOR-601120
3.7V · 100 mAh LiPo Battery
Nominal cell size: 6 × 11 × 20 mm
THOR-480838
3.7V · 110 mAh LiPo Battery
Nominal cell size: 4.8 × 8 × 38 mm
THOR-551521
3.7V · 120 mAh LiPo Battery
Nominal cell size: 5.5 × 15 × 21 mm
THOR-521521
3.7V · 120 mAh LiPo Battery
Nominal cell size: 5.2 × 15 × 21 mm
THOR-302030
3.7V · 120 mAh LiPo Battery
Nominal cell size: 3 × 20 × 30 mm
THOR-501227
3.7V · 130 mAh LiPo Battery
Nominal cell size: 5 × 12 × 27 mm
THOR-501230
3.7V · 130 mAh LiPo Battery
Nominal cell size: 5 × 12 × 30 mm
THOR-501624
3.7V · 140 mAh LiPo Battery
Nominal cell size: 5 × 16 × 24 mm
THOR-242530
3.7V · 140 mAh LiPo Battery
Nominal cell size: 2.4 × 25 × 30 mm
THOR-382024
3.7V · 150 mAh LiPo Battery
Nominal cell size: 3.8 × 20 × 24 mm
THOR-302530
3.7V · 150 mAh LiPo Battery
Nominal cell size: 3 × 25 × 30 mm
THOR-352025
3.7V · 150 mAh LiPo Battery
Nominal cell size: 3.5 × 20 × 25 mm
THOR-501525
3.7V · 150 mAh LiPo Battery
Nominal cell size: 5 × 15 × 25 mm
THOR-501235
3.7V · 160 mAh LiPo Battery
Nominal cell size: 5 × 12 × 35 mm
THOR-651723
3.7V · 170 mAh LiPo Battery
Nominal cell size: 6.5 × 17 × 23 mm
THOR-601230
3.7V · 180 mAh LiPo Battery
Nominal cell size: 6 × 12 × 30 mm
THOR-502025
3.7V · 200 mAh LiPo Battery
Nominal cell size: 5 × 20 × 25 mm
THOR-402035
3.7V · 200 mAh LiPo Battery
Nominal cell size: 4 × 20 × 35 mm
THOR-402030
3.7V · 200 mAh LiPo Battery
Nominal cell size: 4 × 20 × 30 mm
THOR-302248
3.7V · 200 mAh LiPo Battery
Nominal cell size: 3 × 22 × 48 mm
THOR-402525
3.7V · 200 mAh LiPo Battery
Nominal cell size: 4 × 25 × 25 mm
THOR-602025
3.7V · 200 mAh LiPo Battery
Nominal cell size: 6 × 20 × 25 mm
THOR-452030
3.7V · 240 mAh LiPo Battery
Nominal cell size: 4.5 × 20 × 30 mm
THOR-402830
3.7V · 250 mAh LiPo Battery
Nominal cell size: 4 × 28 × 30 mm
THOR-402040
3.7V · 250 mAh LiPo Battery
Nominal cell size: 4 × 20 × 40 mm
THOR-502030
3.7V · 250 mAh LiPo Battery
Nominal cell size: 5 × 20 × 30 mm
THOR-352629
3.7V · 260 mAh LiPo Battery
Nominal cell size: 3.5 × 26 × 29 mm
THOR-602030
3.7V · 300 mAh LiPo Battery
Nominal cell size: 6 × 20 × 30 mm
THOR-502728
3.7V · 300 mAh LiPo Battery
Nominal cell size: 5 × 27 × 28 mm
THOR-502035
3.7V · 300 mAh LiPo Battery
Nominal cell size: 5 × 20 × 35 mm
THOR-481645
3.7V · 300 mAh LiPo Battery
Nominal cell size: 4.8 × 16 × 45 mm
THOR-372527
3.7V · 300 mAh LiPo Battery
Nominal cell size: 3.7 × 25 × 27 mm
THOR-303040
3.7V · 300 mAh LiPo Battery
Nominal cell size: 3 × 30 × 40 mm
THOR-502530
3.7V · 300 mAh LiPo Battery
Nominal cell size: 5 × 25 × 30 mm
THOR-372727
3.7V · 310 mAh LiPo Battery
Nominal cell size: 3.7 × 27 × 27 mm
THOR-802025
3.7V · 350 mAh LiPo Battery
Nominal cell size: 8 × 20 × 25 mm
THOR-672329
3.7V · 350 mAh LiPo Battery
Nominal cell size: 6.7 × 23 × 29 mm
THOR-652030
3.7V · 350 mAh LiPo Battery
Nominal cell size: 6.5 × 20 × 30 mm
THOR-602823
3.7V · 350 mAh LiPo Battery
Nominal cell size: 6 × 28 × 23 mm
THOR-601744
3.7V · 350 mAh LiPo Battery
Nominal cell size: 6 × 17 × 44 mm
THOR-552829
3.7V · 350 mAh LiPo Battery
Nominal cell size: 5.5 × 28 × 29 mm
THOR-502040
3.7V · 350 mAh LiPo Battery
Nominal cell size: 5 × 20 × 40 mm
THOR-501745
3.7V · 350 mAh LiPo Battery
Nominal cell size: 5 × 17 × 45 mm
THOR-501646
3.7V · 350 mAh LiPo Battery
Nominal cell size: 5 × 16 × 46 mm
THOR-402934
3.7V · 350 mAh LiPo Battery
Nominal cell size: 4 × 29 × 34 mm
THOR-303442
3.7V · 350 mAh LiPo Battery
Nominal cell size: 3 × 34 × 42 mm
THOR-403035
3.7V · 350 mAh LiPo Battery
Nominal cell size: 4 × 30 × 35 mm
THOR-702525
3.7V · 350 mAh LiPo Battery
Nominal cell size: 7 × 25 × 25 mm
THOR-403232
3.7V · 360 mAh LiPo Battery
Nominal cell size: 4 × 32 × 32 mm
THOR-552730
3.7V · 380 mAh LiPo Battery
Nominal cell size: 5.5 × 27 × 30 mm
LiPo
THOR-453030
3.7V · 380 mAh LiPo Battery
Nominal cell size: 4.5 × 30 × 30 mm
THOR-802525
3.7V · 400 mAh LiPo Battery
Nominal cell size: 8 × 25 × 25 mm
THOR-802030
3.7V · 400 mAh LiPo Battery
Nominal cell size: 8 × 20 × 30 mm
THOR-602035
3.7V · 400 mAh LiPo Battery
Nominal cell size: 6 × 20 × 35 mm
THOR-522332
3.7V · 400 mAh LiPo Battery
Nominal cell size: 5.2 × 23 × 32 mm
THOR-503030
3.7V · 400 mAh LiPo Battery
Nominal cell size: 5 × 30 × 30 mm
THOR-702030
3.7V · 400 mAh LiPo Battery
Nominal cell size: 7 × 20 × 30 mm
THOR-512728
3.7V · 430 mAh LiPo Battery
Nominal cell size: 5.1 × 27 × 28 mm
THOR-722528
3.7V · 450 mAh LiPo Battery
Nominal cell size: 7.2 × 25 × 28 mm
THOR-502535
3.7V · 450 mAh LiPo Battery
Nominal cell size: 5 × 25 × 35 mm
LiPo
THOR-702530
3.7V · 450 mAh LiPo Battery
Nominal cell size: 7 × 25 × 30 mm
THOR-602040
3.7V · 500 mAh LiPo Battery
Nominal cell size: 6 × 20 × 40 mm
THOR-802528
3.7V · 500 mAh LiPo Battery
Nominal cell size: 8 × 25 × 28 mm
THOR-702540
3.7V · 500 mAh LiPo Battery
Nominal cell size: 7 × 25 × 40 mm
THOR-701555
3.7V · 500 mAh LiPo Battery
Nominal cell size: 7 × 15 × 55 mm
THOR-612338
3.7V · 500 mAh LiPo Battery
Nominal cell size: 6.1 × 23 × 38 mm
THOR-603030
3.7V · 500 mAh LiPo Battery
Nominal cell size: 6 × 30 × 30 mm
THOR-602530
3.7V · 500 mAh LiPo Battery
Nominal cell size: 6 × 25 × 30 mm
THOR-503035
3.7V · 500 mAh LiPo Battery
Nominal cell size: 5 × 30 × 35 mm
THOR-502248
3.7V · 500 mAh LiPo Battery
Nominal cell size: 5 × 22 × 48 mm
THOR-452248
3.7V · 500 mAh LiPo Battery
Nominal cell size: 4.5 × 22 × 48 mm
THOR-403048
3.7V · 500 mAh LiPo Battery
Nominal cell size: 4 × 30 × 48 mm
THOR-383046
3.7V · 500 mAh LiPo Battery
Nominal cell size: 3.8 × 30 × 46 mm
THOR-303450
3.7V · 500 mAh LiPo Battery
Nominal cell size: 3 × 34 × 50 mm
THOR-502050
3.7V · 500 mAh LiPo Battery
Nominal cell size: 5 × 20 × 50 mm
THOR-602535
3.7V · 500 mAh LiPo Battery
Nominal cell size: 6 × 25 × 35 mm
Overview
A small-capacity 3.7V LiPo battery (≤500mAh) is chosen when the battery cavity is extremely constrained and every millimetre of thickness, width and length matters. In this range geometry usually decides the design before capacity does: the same rating is available in very different footprints, so start from the tightest enclosure axis and the usable finished-pack space, then confirm runtime, load, connector and PCM. Compact wearables, miniature sensing electronics, smart accessories and small connected devices all use this class, but the model is selected by fit and load — not by device type.
How to Choose a LiPo Battery at 500mAh and Below
At 500mAh and below, the selection order is different from larger cells:
- Thickness often matters before capacity — in a thin or curved enclosure the achievable thickness caps which cells are even possible, so fix that axis first.
- The same capacity uses very different footprints — a 500mAh cell can be thin-and-wide, narrow-and-long or short-and-thick; pick the shape that matches your cavity, not just the number.
- Finished-pack size matters more than bare-cell size alone — PCM, wire exit, connector, insulation and assembly tolerance all add to the bare cell, so design the cavity around the assembled pack.
For a tightly constrained or unusually shaped cavity, a custom-shaped pouch cell can be developed around the available space.
Browse by Exact Capacity
Jump to a specific capacity in this range for models, dimensions and selection guidance.
You May Also Like
Representative 3.7V LiPo battery models from the ≤500mAh capacity range.
THOR-3010203.7V · 40 mAh LiPo BatteryNominal cell size: 3 × 10 × 20 mm
The THOR-301020 is a 40mAh 3.7V micro lithium polymer battery measuring just 3.0×10×20mm — one of the smallest rechargeable LiPo cells available. Its ultra-thin 3.0mm profile and featherweight 0.8g design make it the go-to power source for hearing aids, cochlear implant accessories, smart rings, miniature biosensors, and micro IoT nodes. Despite its compact size, it delivers a stable 3.7V output with 0.15Wh of stored energy, supporting reliable operation in space-constrained medical and wearable applications.
THOR-5015203.7V · 100 mAh LiPo BatteryNominal cell size: 5 × 15 × 20 mm
THOR-501520 is a 3.7V 100mAh LiPo pouch cell with 0.37Wh nominal energy and a compact 5 × 15 × 20mm bare-cell envelope. Its defining feature is the short 15 × 20mm plan area for miniature OEM assemblies where cavity length is tightly constrained. Final pack size and load suitability require validation with the selected PCM, NTC, wire and connector configuration.
THOR-4020353.7V · 200 mAh LiPo BatteryNominal cell size: 4 × 20 × 35 mm
The THOR-402035 is a 200mAh 3.7V lithium polymer battery (4.0×20×35mm), delivering 0.74Wh at ~3.3g. Mid-profile 4.0mm with 20×35mm area for earbud case compartments. Compared to THOR-302248, THOR-402525, THOR-502025, THOR-602025 (also 200mAh), this variant features a more compact form factor. Ideal for wireless earbud cases, portable biometric sensors, wearable monitors, and key fobs.
THOR-6723293.7V · 350 mAh LiPo BatteryNominal cell size: 6.7 × 23 × 29 mm
The THOR-672329 is a 350mAh 3.7V lithium polymer battery (6.7×23×29mm), delivering 1.29Wh at ~5.7g. Balanced 6.7mm × 23×29mm form bridges slim and deep 350mAh designs. One of 14 350mAh variants — see also THOR-303442, THOR-402934 for alternative dimensions. Ideal for premium earbud batteries, smart ring power cells, compact fitness devices, and wearable health monitors. Volumetric density: 0.29 Wh/cm³.
THOR-5030303.7V · 400 mAh LiPo BatteryNominal cell size: 5 × 30 × 30 mm
The THOR-503030 is a 400mAh 3.7V lithium polymer battery (5.0×30×30mm), delivering 1.48Wh at ~6.5g. Thinnest 400mAh option at 5.0mm — widest 30×30mm area for flat designs. One of 5 400mAh variants — see also THOR-522332, THOR-702030 for alternative dimensions. Ideal for smartwatch batteries, portable health monitors, wireless charging cases, and compact GPS trackers. Volumetric density: 0.33 Wh/cm³.
THOR-6025353.7V · 500 mAh LiPo BatteryNominal cell size: 6 × 25 × 35 mm
THOR-602535 is a 3.7V 500mAh LiPo pouch cell with 1.85Wh nominal energy and a compact 6 × 25 × 35mm bare-cell envelope. Its 25 × 35mm plan area concentrates 500mAh in a smaller footprint than thinner 500mAh alternatives, making it a strong fit where plan area is limited and 6mm nominal cell thickness is acceptable. UN38.3, IEC 62133 and MSDS documentation are available for OEM project review.
Common Device Contexts for 3.7V ≤500mAh LiPo Batteries
These are representative examples only. Final capacity selection depends on enclosure space, runtime target, continuous and peak load, and finished-pack configuration.
TWS Earbuds
Ultra-compact cells that fit the charging case and each bud, with stable 3.7V output.
Wearables & Fitness Bands
High energy density in a thin, light pouch for all-day wear.
Smart Rings
Curved and micro form factors built to match tight ring geometry.
Hearing Assistance & Compact Medical Electronics
Compact LiPo options for hearing-assistance and portable medical electronics, subject to project-specific electrical, mechanical and qualification requirements.
IoT Sensors & Trackers
Long standby cells for wireless sensors, GPS tags and beacons.
Bluetooth & Remote Devices
Consistent power for controllers, styluses and handheld gadgets.
Building something specific? Small Electronic Device Batteries·How custom battery projects work·Production process
Frequently Asked Questions
What does a LiPo battery model number such as 603040 mean?
A LiPo model number normally encodes the cell's thickness, width and length in millimetres — for example 603040 means roughly 6.0 mm thick, 30 mm wide, 40 mm long. It describes only the bare pouch cell, not the finished battery pack.
What is the difference between nominal cell size and finished battery size?
Nominal cell dimensions describe the bare pouch cell. The finished battery pack includes the PCM, tabs, insulation, wires and connector, which add to the overall envelope. Always design your device cavity around the finished-pack dimensions, not the nominal cell size.
Does PCM protection increase the finished LiPo battery dimensions?
Yes, it can, depending on the PCM design and placement. The PCM board, solder pads and insulation add to the finished-pack envelope. The increase depends on the specific PCM size and mounting method (side-mount vs bottom-mount). Always check the finished drawing.
What types of devices typically use small-capacity LiPo batteries (≤500mAh)?
Common applications include compact GPS trackers, BLE beacons, wireless sensor nodes, wearable devices, small environmental sensors and miniature IoT devices. These devices share the constraint of very limited battery space combined with low-to-moderate average current and long standby requirements.
Can a small LiPo battery be made thinner for a tight enclosure?
In some cases, yes. A different cell geometry with the same capacity can trade width or length for reduced thickness. However, very thin cells may have lower energy density per volume, so the capacity achievable in a given footprint decreases. Provide your cavity dimensions and target capacity for a feasibility review.
How should I choose between 200mAh, 300mAh and 500mAh for my compact device?
Start from your available cavity volume and required runtime. If the cavity is very tight, a smaller capacity cell may be the only option that physically fits. If you have slightly more room, a larger cell gives meaningfully longer runtime. Compare the finished-pack dimensions (not bare-cell) of adjacent capacity models side by side. Sometimes a cell at one capacity in a particular geometry fits the same space as a different capacity cell in another geometry, giving additional runtime without a size penalty.
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July 31, 2026When no standard ≤500mAh geometry fits the available cavity, start with LiPo battery dimensions, then review how custom battery projects move from device-space definition to sample validation →