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Sure, here is a description for the battery of Oppo A1K (BLP711) by flyeah:
The Oppo A1K is a budget smartphone that packs a large 4,000mAh battery. This battery is capable of providing over a day and a half of use on a single charge, even with moderate to heavy usage. The battery is also equipped with Oppo's Smart Power Saver feature, which can help to extend battery life even further.
The battery is made of high-quality lithium-ion polymer, which is known for its long lifespan and durability. It is also designed to be safe and reliable, with built-in overcharge and overdischarge protection.
The battery is easy to replace, and there are many third-party batteries available if you need to purchase a replacement.