According to the search results, the Astrum Laptop Replacement Battery For Asus 6 Cell for R599 seems like a great option for your Asus X540L Notebook PC. This listing mentions supporting the X540L model in the product name, so it should be a direct fit for your laptop. At R599, it also provides battery replacement at a reasonable price point. Let me know if you need any other details on this battery or have additional questions!
