A future Oppo/OnePlus device may have a ~7000 mAh battery

OnePlus Ace 3 Pro recently debuted with a 6100 mAh battery, but the next mid-range phone may outshine this spec
Adhiraj S. Chauhan

Digital Chat Station — a leaker with a good track record — claimed on Weibo that Ouga Lab is currently working on a silicon battery that may yield a final result close to the 7000 mAh capacity. Additionally, they suggested that it may seen first in a mid-range device, perhaps the Ace 4 Pro.

The Ace 3 Pro launched earlier this year in China with a 6100 mAh battery, but there are other devices that have 7000 mAh batteries in them, most notably Samsung's F- & M-series devices. There are also the more bulky ones that can push far beyond 10,000 mAh, but those lack in practicality. It will be interesting to see how long it would take for the global market to see such large capacity batteries in Oppo/OnePlus devices, and how much thicker would they end up being.

What's Ouga Lab?

Oppo & OnePlus have long since been under the BBK Holdings umbrella, and during the merger they formed "Oplus", an investor group that also includes Realme, yet "Ouga" is something that's new to us. In 2021, Gizmochina reported on several stories that flesh out the Ouga Group. Chinese corporate structure is a mystery to us, but best we can figure is that it mainly refers to the combined R&D facilities and after-sales service centers in China. Perhaps Oplus and Ouga refer to the same thing, just mistranslated across mediums, or perhaps Ouga is Oplus, but only within China. We couldn't find other sources or official filings.

Silicon battery tech

There's several types and varying definitions: (clicking through the links will send you down rabbit holes you never knew existed)

The Weibo post was not exact in which type of silicon battery was being referred to, and it's not a surprise. These are usually closely-held trade secrets, much like the infamous Coca-Cola formula. However, we can make some educated guesses. Given that we're still in the world of Lithium-ion batteries, and that the Ace 3 Pro had the first type of silicon battery, it's more likely that its successor will also use the same tech.

Li-ion batteries that we've been seeing in mobile phones so far usually have their anodes made from a carbon-based material, e.g. graphite. The theoretical limit for such chemistry is 372 mAh per gram, with commercial applications falling in at much less. Li-silicon batteries on the other hand, use a silicon-based composite which gives us (commercial) capacities in the range of ~500 mAh/g (and maybe more, as the tech advances). What that means is, we can probably pack in more battery — as the consumer perceives it — for the same dimensions & weight.

Other advantages include better performance across a wider-range of temperatures, which could lead to a simpler cooling system implementation in newer devices. Honor Magic V3 (foldable) incorporated the first 10% silicon battery, and other OEMs like Xiaomi also had their own offerings. Oppo & OnePlus are late to the party, if only slightly so.