HP 856843-855 is a replacement battery for a compatible HP laptop, supplying power for portable computer use. Check that your system is designed for this part; the model designation is DN04XL.
The four-cell lithium-ion battery has an energy capacity of 70 Wh and a charge capacity of 4.55 Ah. The listing also associates it with designation DN04070XL-PL, helping distinguish this specific battery from other parts.
This is a laptop power component identified by part number 856843-855, model DN04XL, its chemistry and capacity.