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Specifications: Model: AP21D8M Rechargeable Battery Voltage: 15.4V Capacity: 57.48Wh/3733mAh Package includes: AP21D8M battery, 1 set of matching installation tools, and instructions. This product is rated for up to 500 recharge cycles. Replacement for Part Number: AP21D8M, KT.0040G.015. Compatible with Models: For Acer Nitro 5 AN515-46, AN515-47, AN515-58, AN515-58-56CL, AN515-58-766R, AN515-58-72QR, AN515-58-74JS, AN515-58-75UH, AN515-58-77YC Series. For Acer Nitro 16 AN16-51, AN16-51-74BV, AN16-51-78GX, AN16-51-76BS, AN16-51-56VT Series. For Acer Nitro V 15 ANV15-51 Series. Security & Reliability: This laptop battery is highly compatible with the original AP21D8M Battery and meets CE, FCC, ROHS, and UL certified standards. It is designed with strict compatibility guidelines and built-in circuit protection to ensure safety and stability