61++ 10.8V 6600mAh 72Wh 6-Cell Battery for ThinkPad T470 T480 T570 T580 A475 A485 P51s P52s TP25 Series

New third-party 61++ external laptop battery for compatible ThinkPad T470, T480, T570, T580, A475, A485, P51s, P52s, and TP25 systems. This 6-cell extended-capacity battery is designed as a 100% compatible replacement for systems using the 61 / 61+ / 61++ style rear external battery slot and offers longer runtime than the smaller 61 and 61+ battery versions.

Technical Specifications

• Brand: Unbranded
• Battery Model: 61++
• Part Type: External laptop battery
• Battery Chemistry: Li-ion / Lithium-Ion
• Voltage: 10.8V
• Capacity: 6600mAh
• Energy Rating: 72Wh
• Cell Count: 6-Cell
• Rechargeable: Yes
• Battery Position: Rear external removable battery
• Battery Form Factor: Extended-capacity 61++ style pack
• Color: Black
• Smart Battery Support: Yes
• Protection Features: Over-charge, over-discharge, over-current, and short-circuit protection
• Certifications / Compliance: CE, RoHS, UL-compliant cells
• Battery Type: Third-party compatible replacement battery
• Application Type: Laptop battery replacement / runtime upgrade

Interchangeable / Replacement Part Numbers

61++, 4X50M08812, SB10K97584, SB10K97585, 01AV492, 01AV427

Compatible Smaller-Capacity Battery Options

This 61++ battery is the extended-capacity version. Many compatible systems that support the 61++ battery also support the smaller 61 and 61+ battery families.

61 Standard-Capacity References: 01AV422, 01AV423, 01AV424, 01AV426, 01AV452, 01AV490
Available Option: 01AV422 - 61 Standard-Capacity Battery

61+ Mid-Capacity References: SB10K97582, SB10K97583, 01AV425, 01AV491
Available Option: SB10K97583 - 61+ Mid-Capacity Battery

✅ Confirmed Compatibility

Please note that the following list is not exhaustive. Compatibility depends on your system’s specific configuration, rear battery slot type, BIOS support, and original battery style. It’s essential to verify compatibility with your laptop model and original battery part number prior to installation.

✔ ThinkPad T Series: T470, T480, T570, T580
✔ ThinkPad A Series: A475, A485
✔ ThinkPad P Series: P51s, P52s
✔ ThinkPad Anniversary Model: TP25 / ThinkPad 25
✔ Battery Bay Compatibility: Designed for systems that support the 61, 61+, and 61++ removable rear external battery family.

☑️ Key Features

☑️ New third-party compatible replacement battery
☑️ Extended-capacity 61++ 6-cell design for longer runtime
☑️ 72Wh energy rating for improved battery life compared to smaller 61 and 61+ versions
☑️ Direct-fit replacement for compatible systems using the 61++ rear battery style
☑️ Backward-compatible option for many systems that support 61 and 61+ battery packs
☑️ Smart battery circuitry for charging, power management, and system communication
☑️ Built-in protection against over-charge, over-discharge, over-current, and short-circuit events
☑️ Useful replacement for worn, weak, failed, or low-runtime batteries
☑️ Ideal for users who need longer unplugged runtime from a compatible business laptop
☑️ Factory-fresh replacement unit, not a used pull or refurbished battery

⚙️ Fit Notes

• Match your original battery part number when possible.
• This is the larger 61++ extended-capacity battery style.
• The 61++ version is physically larger than the standard 61 battery and may extend from the rear of the laptop.
• This battery is intended for systems with a removable rear external battery bay.
• This battery is not an internal battery and does not replace the internal bridge battery used in some configurations.
• Confirm your laptop supports the 61 / 61+ / 61++ rear battery family before ordering.
• If your system originally used a 61 or 61+ battery, this 61++ version may fit as the higher-capacity option when the system supports the same rear battery family.
• Allow the battery to fully charge after installation before first heavy use.
• A full charge/discharge calibration cycle may help the system report runtime more accurately.
• Battery runtime varies by system configuration, screen brightness, workload, operating system, battery settings, and battery age.
• Use only a compatible, properly rated AC adapter for charging.
• Always power the system down before removing or installing the battery.
• This is a new third-party compatible replacement battery and is not manufactured by the original system manufacturer.