?Precise Model Coverage? Replacement for HP ProBook 4441s ProBook 4446S ProBook 4440s, perfect match for part numbers: PR06, 3ICR19/66-2, 633733-1A1, 633733-321. ?Upgraded Battery Life? 56Wh optimized capacity, supports 5-7 hours of HD video playback (40% longer life than aging batteries), fast charging up to 75% in 1 hour. ?Safety Certification? CE/RoHS/FCC certified, built-in intelligent IC triple protection (overcharge/overdischarge/short-circuit), ?80% capacity retention for 300 cycles. ?Quiet Design? Fanless structure + graphene heat dissipation layer, to maintain 0 noise operation, suitable for library/bedroom use scenarios. ?Hassle-Free After-Sales Service? 12-month warranty + 30 days no reason to return, if you have any questions or concerns, our dedicated support team is always ready to assist you. ? Premium HP Pavilion Battery Replacement Manufactured with A+ grade lithium-ion cells to deliver 97% original performance at 35% lower cost. ? Compatibility Guarantee: Compatible with Laptop Models: ProBook 4330s ProBook 4331s ProBook 4430s, ProBook 4431s ProBook 4435s ProBook 4436s, ProBook 4530s ProBook 4535s, ProBook 4441s ProBook 4446S ProBook 4440S, ProBook 4545s Replacement for Battery Original Part Numbers: PR06, QK646AA, QK646U, LC32BA122, 3ICR19/66-2, 633733-1A1, 633733-321, 633805-001, 650938-001 HSTNN-DB2R, HSTNN-IB2R, HSTNN-LB2R, HSTNN-OB2R, HSTNN-XB2E, HSTNN-XB2F, HSTNN-XB2G, HSTNN-XB2H, HSTNN-XB2I, HSTNN-XB2N, HSTNN-XB2O, HSTNN-XB2R HSTNN-XB2T, HSTNN-XB3C ? Technical Specifications: Capacity: 56Wh / 10.8V 5200mAh(6-cell slim) Battery Type: Li-ion Polymer (only 13mm thick) Special Feature: Compatible with HP Support Assistant power management Usage Tips: Fully charge and discharge the battery 3 times before first use to activate the battery. Maintains 40%-60% charge for long term storage to extend battery life ? Package Includes: 1 GBLGBD PR06 Replacement Battery 1 User Manual