<div id="readability-page-1"><blockquote><ul><li>&#34;We did a massive amount of cycle and reliability testing before turning it into a technology that can be installed in vehicles on a large scale.&#34;</li><li>To ensure the technology's reliability, BYD conducted long-term continuous validation, including 1,000 full flash-charging cycles.</li></ul></blockquote><figure id="attachment_141130"><img src="https://imageproxy.pbkrs.com/https://cnevpost.com/wp-content/uploads/2026/05/2026051904022196.jpg?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" width="1600" height="900" original-src="https://imageproxy.pbkrs.com/https://cnevpost.com/wp-content/uploads/2026/05/2026051904022196.jpg"/><figcaption id="caption-attachment-141130">(A Denza Z9GT undergoing flash charging at -33°C, as displayed at the Beijing Auto Show in April 2026. Image credit: CnEVPost)</figcaption></figure><p>Sun Huajun, chief technology officer of BYD's (HKEX: 1211) battery business group, publicly responded to doubts that flash charging damages batteries, insisting that technological advancements have broken traditional cognitive boundaries.</p><p>Every increase in charging rates triggers industry concerns about durability, but BYD has solved this problem through an innovative thermal management and electrochemical system, Sun said in an interview with local media 36Kr during the Beijing Auto Show, according to a transcript published Tuesday.</p><p>Although high-current charging inevitably generates higher heat, this doesn't mean it will necessarily lead to structural damage or safety risks for lithium iron phosphate (LFP) batteries, Sun said.</p>    <div>        <p><span>Join us on </span>            Telegram            <span> or </span>            Google News        </p>    </div><p>He said that 70 degrees Celsius was once considered a dangerous upper limit for battery operation, but with advancements in materials science and cooling technology, this mindset should be replaced by new research and development achievements.</p><p>BYD unveiled its second-generation Blade Battery and flash-charging technology on March 5, which supports operation at an ultra-high power of 1,500 kilowatts and can rapidly charge a vehicle's battery from 10% to 97% in just nine minutes.</p><p>Performance in extreme low-temperature environments is also a core highlight of this technological upgrade, with charging efficiency at minus 30 degrees Celsius only about three minutes slower than at room temperature.</p><p>At the 2026 Beijing Auto Show, which concluded earlier this month, BYD set up a large, dedicated exhibition area for the technology.</p><p>Earlier this month, a test of BYD's flash charging by a blogger showed that the battery cell temperature rose to 70 degrees Celsius during the charging process, sparking doubts about the technology.</p><p>To ensure the technology's reliability, BYD conducted long-term continuous validation, including 1,000 full flash-charging cycles, and simulated long-term degradation performance under extreme operating conditions, Sun said in the interview.</p><p>&#34;We did a massive amount of cycle and reliability testing before turning it into a technology that can be installed in vehicles on a large scale,&#34; he said.</p><p>Seventy degrees Celsius is only a cognitive boundary of the past, just as the industry believed a few years ago that the upper temperature limit LFP batteries could withstand was 60 degrees Celsius, he added.</p><p>&#34;We cannot simply look at new technologies using our past experiences, habits, and inertial thinking,&#34; Sun said, noting that people should continuously break through physical limits through innovation.</p><p>BYD plans to build 20,000 flash-charging stations in China by the end of 2026, striving to achieve a 5-kilometer coverage goal for 90% of urban areas.</p><p>Sun said the flash-charging technology has greatly raised the industry's barrier to entry, and only companies with deep accumulation in electrochemical research and systems engineering capabilities can achieve the ability to fully charge a battery within 10 minutes.</p><p>Since early March, BYD has updated a large number of models to switch to the latest flash-charging platform, including the Denza N9 flash-charging edition launched yesterday.</p><p>Notably, this transition has led to short-term battery capacity issues, dragging down delivery volumes.</p><p>BYD chairman and president Wang Chuanfu said last week that overall deliveries are expected to increase as battery supply improves.</p>    <div>        <div>            <p><img width="768" height="432" src="https://imageproxy.pbkrs.com/https://cnevpost.com/wp-content/uploads/2026/05/2026051511061535-768x432.jpg?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" original-src="https://imageproxy.pbkrs.com/https://cnevpost.com/wp-content/uploads/2026/05/2026051511061535-768x432.jpg"/>                            </p>        </div>        <div>            <p>BYD sees monthly sales climbing on battery capacity ramp-up</p>            <p>BYD chairman Wang Chuanfu said current battery capacity is tight as several key models enter the ramp-up phase.</p>                    </div>    </div>                                                                                    </div>

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<p>BYD's chief technology officer, Sun Huajun, assured that their new 9-minute flash charging technology does not harm battery life, following extensive testing. The technology allows rapid charging from 10% to 97% in nine minutes and operates efficiently even in extreme temperatures. BYD plans to build 20,000 flash-charging stations in China by 2026. Despite initial battery capacity issues affecting deliveries, BYD expects sales to rise as production stabilizes.</p>

- BYD conducted extensive cycle and reliability testing, including 1,000 full flash-charging cycles, to ensure their new battery technology's reliability.  
- The second-generation Blade Battery supports ultra-fast charging at 1,500 kilowatts and can charge from 10% to 97% in nine minutes, even in extreme temperatures.  
- BYD plans to build 20,000 flash-charging stations in China by the end of 2026, aiming for widespread urban coverage, despite current battery capacity tightness affecting deliveries.

BYD top scientist says 9-minute flash charging won't damage battery life