Dispositifs portables

Smart bands and smartwatches are currently mainstream wearable devices in consumer electronics. They feature a slim and portable design, 24/7 monitoring, and intelligent interaction.

Symbo has independently developed ultra-thin, miniature lithium-polymer pouch cells specifically for smart wearables. Supporting an ultra-slim profile as thin as 0.4mm, these batteries are widely used in ultra-thin smart bands, slim electronics, micro-consumer electronics, compact wearables, and miniature sensing devices. We offer customization for curved, rounded-corner, and irregular shapes. Also, we deliver high energy density, ultra-low self-discharge, and exceptional cycle life. Perfectly suited to the internal power requirements of the full range of smart bands and smartwatches, our batteries serve as a core power solution for consumer wearables.

Our batteries utilize a black aluminum-laminated film pouch packaging process; free from the constraints of a rigid casing, they are lightweight, compact, and manufactured to precise, stable dimensions. The cells feature a highly stable pure cobalt cathode and a modified graphite anode, utilizing aluminum foil and copper foil as current collectors, respectively, along with a high-temperature-resistant separator. This design ensures low internal resistance, long cycle life, low self-discharge, and stable discharge output, while effectively minimizing the risks of swelling and leakage.

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Why Do Smartbands and Smartwatches Use Specialized Ultra-thin Polymer Lithium Batteries?

As smart wearable devices become increasingly thinner and lighter, their internal space becomes extremely limited. Traditional lithium batteries are too thick, rigid, have low space utilization, and offer insufficient battery life. Over time, they are also prone to bulging, leakage, and safety hazards, and can no longer meet the needs of large-scale production or long-term wear.

Our newly developed ultra-thin polymer lithium battery for wearable devices uses a flexible aluminum-plastic film stacking process. We offer OEM/ODM customization services for ultra-thin, curved, irregular, and rounded designs, maximizing the use of the limited space inside smart wearable devices. This series of batteries features an integrated multi-protection BMS (Battery Management System), ensuring stable charge and discharge performance and excellent cycle life.

Therefore, our proprietary ultra-thin polymer lithium batteries far surpass standard lithium batteries in terms of safety and stability. They are ideal for devices worn close to the body in enclosed environments. These batteries are widely compatible with various smart wearable devices, including consumer, sports, healthcare, and child-safety smart bracelets and watches.

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Our Ultra-thin Lithium Battery Solutions for Wearable Devices Features

  • Its ultra-thin design makes it suitable for the narrow spaces inside ultra-thin devices.
  • Our Ultra-thin LiPo Battery supports custom molding (such as curved, rounded, notched, and irregular shapes).
  • Employing high-energy-density stacked battery cell technology, it effectively extends the daily use and standby time of smart bracelets and smartwatches.
  • Extremely low self-discharge rate ensures that power loss is minimized during long-term storage.
  • The packaging structure is stable and durable, reducing bulging or leakage.
  • Long cycle life: more than 500 cycles under standard 0.5C charge and discharge conditions. Even, our batteries can achieve 800–1000 cycles using advanced silicon-carbon technology.
  • It meets high safety standards for close-fitting wear. It features a five-fold protection BMS and is certified by IEC62133 and UN38.3 to ensure safety when in direct contact with the skin.
  • It is compatible with mainstream charging solutions and adapts to the charging designs of various smartwatches and smart bracelets.
  • Utilizing advanced lamination technology, the leads, pads, and protection schemes all support deep customization.
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Solutions de batteries au lithium ultra-minces pour appareils portables

Wearable Devices LiPo Battery Model Spec.

Modèle Nominal Capacity (mAh) Tension nominale (V) Épaisseur (mm) Largeur (mm) Longueur (mm) Courant de charge standard (mA) Courant de décharge standard (mA) Cycle Life @0.5C
251314 33 3.8 2.5 13 14 7 6 ≥500 times
350819 40 3.7 3.5 8 19 8 8 ≥500 times
351423 90 3.7 3.5 14 23 18 18 ≥500 times
552024 290 3.8 5.5 20 24 58 58 ≥500 times
602828 580 3.8 6.0 28 28 116 116 ≥500 times
652731 630 3.7 6.5 27 31 126 126 ≥500 times
682421 330 3.7 6.8 24 21 66 66 ≥500 times
751524 220 3.7 7.5 15 24 44 44 ≥500 times
812831 800 3.8 8.1 28 31 160 160 ≥500 times
902040 700 3.7 9.0 20 40 140 140 ≥500 times
951635 600 3.8 9.5 16 35 120 120 ≥500 times

Note: Battery lead configuration, wire length, protection scheme, and tab position can all be customized according to the customer’s product structure. For specific requirements (including CB, BIS, KC, and other certification documents), please contact our sales team.
We can manufacture customized battery cells to meet the size and capacity requirements of smart bracelets or smartwatches. These include non-standard dimensions (length, width, thickness) as well as curved or irregular designs.