Success Story – Overcoming Space Constraints with a High-Performance Battery Solution for Handheld Gaming Devices

Optimizing Space and Performance through Advanced Cell Integration and BMS Technology

Market Trend

According to Mobility Foresight, the handheld gaming battery market is growing alongside the rising demand for portable gaming devices. As gamers seek longer playtime and high-performance gaming experiences on the go, battery solutions with higher energy density, longer cycle life, and greater efficiency are becoming increasingly important. Looking ahead, wireless charging technologies and advanced Battery Management Systems (BMS) are expected to play an increasingly important role in the market by improving charging convenience, energy efficiency, battery safety, and overall device performance. These trends will continue to drive innovation in battery solutions for next-generation handheld gaming devices.

Project Background

As gaming handhelds continue to evolve toward higher performance, more powerful processors, and longer operating times, battery design has become an increasingly important part of the overall product experience. Unlike conventional consumer electronics, handheld gaming devices must balance multiple requirements within a highly constrained mechanical space, including battery capacity, product weight, thermal performance, operating time, cost, and user comfort. For this project, the customer required a customized battery solution for a gaming handheld with limited internal space and a non-conventional battery layout. To maximize the available space, the battery system needed to accommodate cells of different sizes in a custom L-shaped configuration. At the same time, the solution had to provide sufficient capacity without significantly increasing the overall weight or compromising the ergonomics of the handheld device. Beyond mechanical integration, the customer also required stable charge and discharge performance, low power consumption during extended standby periods, and reliable operation over a long service life. The battery solution therefore needed to address not only energy capacity, but also electrical balance, safety, aging, long-term storage, and global battery compliance requirements.

Technical Challenges

The use of cells of different sizes within the same battery system introduced a number of engineering challenges that are not typically encountered in conventional battery packs. At the cell level, differences in internal resistance, capacity, chemistry, aging characteristics, and polarization behavior can lead to uneven current distribution when cells are connected in series or parallel. If these differences are not properly managed, one cell may carry a disproportionate share of the charge or discharge current, potentially accelerating degradation and reducing the overall reliability of the battery pack. The BMS and protection circuitry presented another critical challenge. Different cells may respond differently under the same operating conditions, making it necessary to carefully manage current distribution and maintain proper balance among the cells. Without effective control, electrical imbalance can lead to excessive current flow, overcharging, localized heat generation, or accelerated long-term degradation. Long-term standby performance was also an important consideration. Gaming handhelds may remain unused for weeks or even several months. Excessive BMS quiescent current during these periods can gradually reduce the battery’s state of charge (SOC) and, in extreme cases, result in over-discharge or prevent the device from restarting normally. Finally, the customer required long-term reliability and validation under demanding operating conditions. The battery needed to maintain stable performance throughout repeated charge and discharge cycles while also being evaluated under high-rate and high-temperature conditions. Cell aging, swelling, thermal behavior, and long-term balance all needed to be monitored as part of the validation process.

Atemitech's Technical Strengths

Atemitech addresses these challenges through a system-level battery engineering approach that integrates cell selection, BMS design, battery pack development, validation, process management, and mass production. Rather than treating the battery as simply a collection of cells, Atemitech evaluates the electrical and physical characteristics of each cell during the early design stage. For battery packs using cells of different sizes, cell matching and consistency management are particularly important. Internal resistance, capacity, chemistry, aging characteristics, and charge and discharge characteristics are considered when determining the appropriate cell configuration. This approach allows the battery architecture to be optimized around the customer’s mechanical constraints while maintaining stable electrical performance. The result is a customized solution that addresses both the physical limitations of the handheld device and the electrical requirements of the battery system.

How Atemitech Addresses the Technical Challenges

To manage differences between cells, Atemitech applies a combination of cell matching, current distribution control, and BMS protection strategies. For parallel configurations, differences in internal resistance are evaluated to assess potential current imbalance and establish an appropriate current-sharing strategy among the cells. At the BMS level, the control strategy can be designed to account for variations in cell characteristics and manage the operating conditions of the battery system. Current distribution and protection parameters are carefully evaluated to help prevent abnormal charge and discharge conditions. Operating temperature ranges are also considered to minimize the impact of temperature extremes on battery performance and service life. Polarization behavior is another important consideration. Keeping cells within their appropriate operating ranges helps reduce excessive stress and prevents imbalance from developing into a long-term reliability issue. This is particularly important for a battery system that combines cells with different electrical characteristics. Atemitech also performs extensive validation because a mixed-cell architecture requires more detailed monitoring than a conventional battery pack. During validation, the charge and discharge behavior of individual cells can be monitored over extended periods, allowing engineers to evaluate cell balance, aging trends, thermal behavior, and capacity retention. High-rate and high-temperature conditions are also included in the validation process to evaluate battery performance under demanding operating scenarios. For applications requiring long standby periods, BMS power consumption and over-discharge protection are also carefully evaluated. The objective is to ensure that sufficient battery capacity remains available after extended periods of inactivity while protecting the cells from excessive discharge.

Additional Technical Features

Beyond battery design and validation, Atemitech provides capabilities covering the entire battery development and manufacturing process. These include DC/AC charge and discharge testing, wide-temperature-range operation, battery protection, pack-level validation, process management, and mass production. Quality control is integrated throughout the manufacturing process, including inspections of semi-finished products, finished battery packs, appearance, and OMD-related processes. This helps ensure consistent battery performance not only during engineering validation but also throughout mass production. By combining cell-level engineering, BMS development, system validation, manufacturing process control, and production management, Atemitech provides a comprehensive battery development solution for gaming handhelds and other space-constrained portable devices. For customers developing next-generation handheld products, this system-level approach enables battery performance, mechanical constraints, safety, standby life, and long-term reliability to be addressed as part of an integrated battery system. By bringing these requirements together from the early design stage through validation and mass production, Atemitech transforms highly constrained battery designs into reliable, market-ready power solutions.