462976-001, Hewlett Packard Enterprise Battery backed write cache (BBWC) battery module - Ni-MH, 4.8V, 650mAh - For use with the P212, P410, and P411 SAS controller boards | EET
Supstone New 460499-001 Battery For Hp Controller P410 P411 P410i P212 Bbwc 462969-b21 462976 Hstnm-b011 - Laptop Batteries - AliExpress
HP 587324-001 Smart Array P410 Flash Backed Write Cache FBWC Battery Module for sale online | eBay