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    Different types of consumer lithium primary batteries on display Photo: VCGChinese researchers have developed a new high-energy lithium primary battery that can deliver both long-lasting energy and strong bursts of power while maintaining stable performance at temperatures as low as -40 C, Science and Technology Daily reported on Monday.
A research team led by Chen Zhongwei at the Dalian Institute of Chemical Physics under the Chinese Academy of Sciences developed a 25-ampere-hour pouch-type lithium-metal primary battery. Tests conducted by the safety laboratory of the China Electronics Standardization Institute showed that the battery achieved an energy density of more than 750 Watt-hour per kilogram at a low discharge rate, according to the report.
Meanwhile its discharge rate can be increased by up to 100 times, enabling short bursts of high-current discharge at 10C. The "C" stands for C-rate, which is the charge and discharge rates of a battery. According to sector website Battery University, the capacity of a battery is commonly rated at 1C, meaning that a fully charged battery rated at 1Ah should provide 1A for one hour. The same battery discharging at 0.5C should provide 500mA for two hours, and at 2C it delivers 2A for 30 minutes. 
The new battery puts China among the world's leading players in high-power primary battery technology.
Primary batteries offer high specific energy, long storage times and instant readiness, allowing them to be used immediately even after long storage. 
Primaries play an important role, especially when charging is impractical or impossible, such as in military combat, rescue missions and forest-fire services, the article said. 
Traditional lithium primary batteries can store large amounts of energy for long periods, but their ability to rapidly release that energy can be limited. The new battery is designed to combine high energy density with high power output, allowing it to both operate for extended periods and provide large amounts of power when needed.
The battery can deliver short bursts of high-current discharge at up to 10C and sustain discharge at 4C. At room temperature, its specific power reaches 4,487 Watts per kilogram, according to Science and Technology Daily.
The battery also maintains strong performance under extremely cold conditions. At -40 C, the battery retains an energy density of 447 Watt-hour per kilogram at a 1C discharge rate. Its annual self-discharge rate is below 1 percent, meaning that it loses relatively little stored energy during long periods of standby.
Such characteristics could make the battery suitable for equipment that needs both long-term energy storage and sudden high-power output, including drones, robots, spacecraft and sensors deployed in remote areas.
Chen said the team achieved a breakthrough in cathode materials by developing a high-entropy oxide material and has established a pilot production line with an annual capacity of 10 tons, linking material development with battery-cell production.
The battery has passed third-party testing and is now undergoing further validation for applications including drones, robots, spaceflight simulators and field sensor nodes, according to Chen.
Global Times 
。    On Ram Navami, a festival that celebrates the birth of Lord Ram , the Navmi day of the chaitra Navratri and the enduring values of devotion and righteousness, Narendra Modi chose to share more than a customary greeting. His post featuring the devotional song “Maay Bhavani” brought a sense of spiritual depth to the occasion, reminding listeners of the quiet power of music rooted in faith.           The song, from the Marathi film Shahbaz Sunbai, belongs to a time when cinema and music were deeply intertwined with cultural and devotional expression. Its composition by Meena Mangeshkar Khadikar carries a sincerity that avoids excess, allowing the essence of devotion to take centre stage. In an era of fleeting soundscapes, such compositions stand apart for their stillness and emotional clarity.          It is, however, the voice of Lata Mangeshkar that celebrates “Maay Bhavani” into something timeless. Her music has long defined the emotional memory of India, moving effortlessly between romance, melancholy, and devotion. In songs of a spiritual nature, her voice often feels less like performance and more like prayer, marked by an almost meditative purity. This quality lends the composition a rare depth, making it especially fitting for a day like Ram Navami, where devotion is both personal and collective.          For authors Rachna Shah and Rhythm Wagholikar, the moment carried a deeply personal resonance. Responding to the Prime Minister’s post, they shared a note that captured both gratitude and memory, offering readers a glimpse into the story behind the song.           Their note is reproduced here in full:           ⸻           Dear friends,           It’s so heartwarming to see our honourable Prime Minister Shri. Narendra Modiji post a song on Maa Ambe - Maay Bhavani, on the auspicious day of Ram Navami.     The striking part is that this song is composed by my mother Meena Mangeshkar Khadikar and sung by my aunt Lata Mangeshkar..           We just chatted with Aai and told her regarding this post.     She shared an interesting behind-the-scene story.           This song was originally to be composed by Lata didi herself, however during those days, Didi was overwhelmed with the work load and couldn’t dedicate the time required.     So, she requested her sister Meena to step in and do the needful. Meena Mangeshkar Khadikar was an established composer and took charge and this composition took its birth…           This post by our beloved Prime Minister opened up a floodgate of beautiful memories and with our heartfelt sentiments we stand in gratitude.           Warm regards,     Rachana Rhythm           ⸻           What emerges from this reflection is a story of artistic trust and familial bond. The decision by Lata Mangeshkar to pass on the responsibility of composition to her sister reveals not just the pressures of her time, but also the quiet confidence she had in Meena Mangeshkar Khadikar’s musical sensibility. It is in such moments that enduring art often finds its form.           The Prime Minister’s gesture, therefore, does more than revive a song. It reconnects audiences with a legacy, one that spans generations and continues to shape India’s cultural identity. For Rachna Shah and Rhythm Wagholikar, it is a moment of remembrance and gratitude. For listeners, it is an invitation to rediscover a melody that carries both devotion and history within it.           Also Read: Sharda Sinha: A Voice That Became The Prayer of The Soil。

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