3.7V Lithium Polymer Batteries — Up to 500mAh

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.

The THOR-501125 is a 100mAh 3.7V lithium polymer battery in a compact rectangular form factor (5.0×11×25mm), delivering 0.37Wh at ~1.6g. 5.0mm depth with narrow 11×25mm strip for deep earbud channels. Compared to THOR-401129, THOR-402020, THOR-601120 (also 100mAh), this variant features a more compact form factor. Ideal for TWS earbud batteries, hearing aids, smart jewelry cells, and micro recorders.

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.

The THOR-602535 is a 500mAh 3.7V lithium polymer battery (6.0×25×35mm), delivering 1.85Wh at ~8.1g. Balanced 6.0mm × 25×35mm form bridges slim and deep 500mAh designs. One of 14 500mAh variants — see also THOR-303450, THOR-383046 for alternative dimensions. Ideal for premium TWS earbuds, hearing device batteries, smart jewelry cells, and wearable translator power. Volumetric density: 0.35 Wh/cm³.