Lenovo 42T4555 | 4-Cell Li-Ion Battery for ThinkPad T400 R400 T61 R61

Technical Specs:
- Battery Type: Li-ion
- Battery Capacity: 2600 mAh
- Battery Voltage: 14.4 V DC
- Number of Cells: 4
- Compatibility: ThinkPad T400, R400, T61, R61

Helpful Notes:
- This battery has a capacity of 2600 mAh, which is lower than some other options on the market.
- It is compatible with several older ThinkPad models, so be sure to check compatibility before purchasing.
- Li-ion batteries are known for their longer lifespan and higher energy density compared to other battery types.