The evolution of handheld gaming has largely been measured through processing power, display resolution and frame rates. However, as portable devices become capable of running increasingly demanding games, another set of engineering priorities is emerging: battery endurance, thermal efficiency and ergonomics. Together, these factors determine not just how well a device performs, but how comfortably and consistently it can be used.
Battery Life: Beyond Bigger Batteries
Battery life remains one of the biggest constraints in portable gaming. According to Valve's official specifications, the Steam Deck OLED features a 50Wh battery offering an estimated 3–12 hours of gameplay. Nintendo's Switch 2, meanwhile, offers approximately 2–6.5 hours, depending on the game and usage conditions.
These variations underline a fundamental engineering challenge: higher performance inevitably places greater demands on limited energy reserves.
Manufacturers have responded by increasing battery capacity. ASUS, for instance, doubled the battery capacity from 40Wh in the original ROG Ally to 80Wh in the ROG Ally X.
Yet, larger batteries introduce additional weight and space requirements. The long-term opportunity lies in improving performance per watt through efficient processors, adaptive power management and intelligent workload distribution.
For portable gaming, efficiency must be treated as a core performance metric rather than an afterthought.
Thermal Management: Sustaining Performance Over Time
Powerful processors generate heat, particularly during graphically intensive gaming sessions. Without effective thermal management, devices can experience thermal throttling, where processing speeds are reduced to prevent overheating.
This makes sustained performance more meaningful than peak benchmark scores.
Thermal design also directly affects user comfort. In its ROG Ally X redesign, ASUS reported that improved airflow increased air volume by 24%, while reducing touchscreen temperatures by up to 6°C.
Such improvements demonstrate why cooling systems must be designed around both internal components and external touchpoints.
For handheld manufacturers, the challenge is balancing heat dissipation, fan noise, power consumption and device thickness. Effective cooling should allow a device to maintain predictable performance throughout a gaming session, rather than delivering short bursts of speed.
Ergonomics: The Often-Overlooked Performance Factor
Unlike traditional consoles, handheld devices require users to support the entire system while operating its controls. This makes physical design inseparable from the gaming experience.
Consider the weight differences across devices. The Steam Deck OLED weighs approximately 640 grams, while the ROG Ally X weighs 678 grams. Even relatively small variations in weight distribution can influence how a device feels during extended use.
Grip contours, joystick placement, trigger accessibility and centre of gravity all contribute to usability. A heavier device with balanced weight distribution and properly positioned controls may feel more comfortable than a lighter device with poorly designed ergonomics.
Importantly, ergonomics cannot be optimised through specifications alone. Repeated physical prototyping and testing across different hand sizes and playing positions are essential.
Designing for the Complete Gaming Session
The next phase of handheld innovation will require manufacturers to move beyond isolated hardware specifications and consider the complete gaming experience.
Battery capacity influences weight. Processing power determines thermal requirements. Cooling architecture affects grip design, thickness and comfort. Every engineering decision creates consequences elsewhere in the device.
As handheld gaming matures, the competitive advantage will increasingly belong to devices that balance these interconnected priorities.
The real measure of a well-designed handheld is not simply how powerful it performs in the first ten minutes, but how reliably and comfortably it continues performing an hour or two later.
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By : Kaustubh K. Jadhav | Co-Founder, ARC
