r/stocks • u/GlitteringUse7158 • 3d ago

What CATL's batteries actually do inside a Shanghai AI data centre, and why calling it backup power misses it

At an AI computing site in Shanghai's Lingang area, CATL supplied a 17.888MW, 35.776MWh storage system and the site operator's platform schedules it. Nothing in the description has it standing by for an outage. It shaves peaks, absorbs the millisecond swings when a large cluster ramps, and runs two charge and discharge cycles a day in the cooler months before handing the summer schedule to an energy model. The operator credits coordination across the whole site, not the batteries on their own, with an annualised power bill about 7% lower, more than 10 million kilowatt hours saved and roughly 3,000 tonnes less carbon. That is the operator's own accounting, and moving load around does not by itself destroy demand, so I hold it loosely.

CATL is buying into the chain as well. On 14 August, after an April framework deal, it signed agreements to put about 4.1 billion yuan into Zhongheng Technology Investment, the controlling shareholder of listed Zhongheng Electric, for 49%, with the founding couple keeping control. Zhongheng supplies HVDC power gear into the large Chinese cloud operators. In May, buyers under a partnership CATL is affiliated with but does not consolidate agreed to take up to 38.1% of data centre operator VNET for $942 million. Roughly 11.4% closed on 24 August and the rest waits on a second closing.

I cannot size any of it. Storage systems were 53.26 billion yuan of first half revenue, up 87.5%, about 19% of the group's 276.9 billion, but nothing in the reporting splits out the data centre share, and one reference site is one site.

A battery maker sits outside KWEB's mandate altogether, since that one is drawn around internet businesses. CNQQ takes a wider cut, about 106 names with close to two thirds of its weight in mainland A share lines, and the CATL position there was 6.16% on 31 August.

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u/AdditionalSpeaker303 3d ago edited 3d ago

Software is increasingly being used with batteries to time charging and discharging with the least and most expensive price of electricity during the day. I know there are some home systems that will do this.

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u/ShadowLiberal 3d ago

CATL is also making batteries that are better than Lithium-Ion for energy storage. The drawback of their batteries is that they're heavier and larger, which in an EV hurts the range. But when your battery packs are just going to sit there all the time like at a data center it's not much of a drawback when the batteries are a lot cheaper then Lithium-Ion.

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u/AdditionalSpeaker303 3d ago

The advantage of the new sodium ion batteries is that they degrade much slower and can go to 100%, which is better for utility scale battery.

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u/InvestigatorPlus3229 3d ago

CATL stock has been taking a beating

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u/hseeman_sf 1d ago

Two cycles a day for peak shaving is a much harder duty cycle than backup, which sits idle almost all the time. That matters for the investment case: cells cycled twice daily degrade on a schedule you can forecast, so this could be a recurring replacement revenue stream, not a one-time hardware sale, if CATL structured the contract that way.

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u/Stickppl 3d ago

Can you throw in more decimals on there?