Earlier this year, a tipster revealed that vivo was testing a smartphone battery with a typical capacity ranging between 11,000mAh and 12,000mAh. Now, the same source has provided a fresh update on the battery’s development, suggesting that it is moving closer to appearing in a commercial device.

According to well-known tipster Digital Chat Station, vivo’s 12,000mAh battery has entered mass production. It reportedly has a rated capacity of 11,970mAh, making it one of the largest smartphone batteries currently being developed.

However, the tipster has not disclosed which upcoming vivo smartphone will feature the new battery. The company recently launched the Y600 in China with a 10,000mAh battery, although that device is a rebranded version of the S2 FE, which is also available as the V80 Lite in select markets.

Digital Chat Station further claims that vivo is testing batteries with even larger capacities for future smartphones featuring large displays, suggesting that the company could be exploring even bigger battery options for its upcoming devices.