Ultrabay Slim Battery II

Ultrabay Slim Battery II (40Y6789) This is a battery pack that slides into an Ultrabay Slim or Enhanced with power interfacing pins. Features Battery specification: 2.7Ah, 10.8V, 29.16Wh Battery cell count: Three, 3.6V lithium-ion polymer prismatic cell Battery run time: up to 2.3 hours Battery charge time: up to 4.6 hours Weight: 235 grams or 0.52 pounds FOOTNOTES [Δ] This battery pack cannot be used in T4x/R5x models as they have a different battery pin layout. This battery pack cannot be used in a W500, T400, T400s, T410s, T410si, T420s, T420si, T500, R400, and the R500, as it has a different 'ejecting' design to allow it to be ejected differently. Despite the differences in design, the battery terminals are oddly the same.

Part numbers

Branded as the Advanced Ultrabay Battery

• 41U4890 (40Y6787), 40Y6790 (40Y6787)

Usage and Linux support

See How to use Ultrabay batteries.

Models supporting this accessory

• T60, T60p, T61, T61p
• R60, R60i, R61, R61i
• Z60t, Z61t, Z60m, Z61m, Z61p
• ThinkPad X6 UltraBase, ThinkPad X6 Tablet UltraBase