DGTECH 77+ Replacement Battery for Lenovo ThinkPad P50 P51

This battery is a direct-compatible replacement for multiple Lenovo part numbers (77+, 77, 77++, 01AV477, 01AV495, 01AV496, SB10K97634, SB10K97635, SB10H45077, SB10H45078 and related SKUs). It supplies 11.4V and 90Wh (7.9Ah) of capacity using Grade A cells and onboard circuit protections designed to stabilize output and reduce leakage risk. The pack is intended for users who need to restore runtime to older ThinkPad workstations without replacing the entire machine.

What specifications should I expect from the DGTECH 77+ battery?

The DGTECH 77+ battery is rated 11.4 volts and 90Wh (7.9Ah), matching the original equipment specifications for the compatible ThinkPad models. It uses high-grade cells and a protection circuit to maintain stable output under typical laptop loads.

• Voltage: 11.4V
• Capacity: 90Wh / 7.9Ah
• Grade A lithium cells for improved longevity
• Built-in circuit protection to prevent overcharge, overcurrent, and short circuits

Which Lenovo models and part numbers are compatible with this battery?

This pack is manufactured to be compatible with a wide range of ThinkPad P50, P51 and P52 configurations and replaces many OEM part numbers. Confirm your laptop’s existing battery label or machine documentation against the listed part numbers before purchase.

• Compatible models: ThinkPad P50 / P51 / P52 series (including regional revisions)
• Replaces: 77+, 77, 77++, 01AV477, 01AV495, 01AV496
• Also cross-references: SB10K97634, SB10K97635, SB10H45075–SB10H45078, 00NY490–00NY493
• Model-specific support: P50-20EQ, P50-20EN, P51-20HH, P51-20HJ, P52-20M9 and similar SKUs

How should I install and condition the new battery for best results?

Follow simple installation and conditioning steps to maximize battery performance and accuracy of the laptop’s charge reporting. DGTECH recommends making sure the battery seating and connector are fully engaged before use and cycling the battery several times during the first few charges.

• Confirm the interface is fully connected during installation
• Initial conditioning: discharge to ~5% (avoid full 0%) then charge to ~95%
• Repeat the discharge/charge cycle 3–4 times to calibrate power management
• Store at partial charge if not used for extended periods

How does DGTECH ensure safety and reliability in this replacement battery?

DGTECH builds the pack with Grade A cells and an integrated protection circuit to reduce the chances of leakage, overcurrent, or overcharge. While aftermarket batteries cannot change the laptop’s original design, these quality controls help preserve system stability and extend usable life compared with worn-out cells.

• Grade A cells selected for consistent output
• Onboard circuitry for overcharge, overcurrent, and short protection
• Quality checks during assembly to reduce early failures
• Installation tips included to avoid connector issues

Who is this for: The DGTECH 77+ battery is aimed at professionals and power users who rely on Lenovo ThinkPad P50/P51/P52 laptops and need to regain full mobile runtime without migrating to a new machine. It suits IT technicians replacing worn packs, creative and engineering professionals using workstation-class ThinkPads, and anyone seeking a high-capacity, drop-in compatible battery with protective circuitry and clear conditioning guidance.