01AV477 00NY493 77+ 77++ Laptop Battery 90Wh - Extended Runtime

Our review of the 01AV477 00NY493 77+ 77++ laptop battery focuses on replacement power for Lenovo ThinkPad P50, P51 and P52 users who need reliable capacity without replacing the whole machine. This battery supplies a high-capacity 90Wh Li-ion pack in a 9-cell configuration, and the single biggest reason to consider it is the extended runtime it can restore to older mobile workstations. It is presented as 100% new from manufacturer, supports up to 500 recharge cycles, and includes guidance for initial conditioning to maximize lifespan.

Key Features

• High capacity: The 90Wh rating provides noticeably longer run time compared with lower-capacity replacements, so users can work away from power outlets for extended sessions.
• Compatible voltages: With nominal voltages of 11.25V and 11.4V listed, it matches the electrical requirements of several ThinkPad P50/P51/P52 variants for safe operation.
• Wide compatibility: Labeled to replace many part numbers, it fits a range of P50, P51 and P52 model series so owners of these laptops can often swap batteries without searching multiple SKUs.
• 9-cell chemistry: The 9-cell Li-ion construction balances energy density and reliability for workstation-style laptops that demand sustained performance.
• Manufacturer new: Sold as 100% new from the manufacturer, it arrives as a fresh battery rather than a refurbished unit, which may reassure buyers concerned about cycle history.

Who It's For

This battery is aimed at professionals and technicians who use Lenovo ThinkPad P50, P51 or P52 series laptops and need to restore original-like battery life without upgrading the whole system. It makes sense for mobile engineers, designers and anyone who spends hours away from a power source and values consistent runtime.

It is not ideal for users whose specific model is not listed among the compatible series, or for buyers who require manufacturer warranty parity from an official brand channel; compatibility reports from customers are mixed, so confirm your exact model and part number before purchase.

Pros & Cons

Pros

• High 90Wh capacity delivers extended on-battery time for intensive tasks.
• List of replaced part numbers and series increases the chance of a direct fit for many P50/P51/P52 units.
• Rated for up to 500 recharge cycles when used and conditioned per instructions, suggesting reasonable long-term durability.

Cons

• Some customers report compatibility issues with specific P50 units, so model verification is necessary before buying.
• Actual runtime varies with workload and settings, so heavy users may see less than expected battery life.

Specifications

Battery type	Li-ion
Voltage	11.25V / 11.4V
Capacity	90Wh
Cells	9-cell
Compatible models	Lenovo ThinkPad P50, P51, P52 series
Replace part numbers	01AV477, 00NY490-00NY493, 01AV495/01AV496, SB10K97634/35, L17L6P51/L17M6P51
Cycle life	Up to 500 recharge cycles

Our Verdict

The 01AV477 00NY493 77+ 77++ 90Wh battery is a practical value for ThinkPad P50/P51/P52 owners who need extended on-battery runtime and a manufacturer-new replacement. It provides a large 90Wh capacity and a long expected cycle life, but buyers should verify exact model compatibility because a few users experienced fit issues. For confirmed-fit systems, this battery restores mobility at a lower cost than system replacement.

Frequently Asked Questions

Will this battery fit my ThinkPad P50?
Check your laptop's original part number or service tag and compare it to the listed replace part numbers; some customers reported mixed compatibility so confirmation is recommended.

How long will the battery last on a full charge?
Actual runtime depends on workload and settings, but the 90Wh capacity should offer noticeably longer use than lower-capacity replacements for typical office and light multimedia tasks.

Are there conditioning steps for first use?
Yes, follow the seller guidance: discharge to about 5% (not 0%) then charge to 95% and repeat for 3-4 cycles to help condition the pack.