SigmaRion 3 with Windows CE, includes two batteries (standard and high-capacity). The battery included with the main unit has deteriorated over time, and the power turns off when the AC adapter is unplugged. Two batteries purchased as options (one high-capacity) were stored unused for a long time. To check the battery condition, I charged them to 100%, unplugged the AC adapter, and with the backlight on, the battery remaining after one hour was: - Standard battery: 80% - High-capacity battery: 100% Although they have aged, the deterioration is unknown, but I don't think they are completely unusable. The photo of the system running shows the standard battery purchased as an option installed. Please check the fine scratches in the photos. - Model name: sigmarion III - Accessories: AC adapter, 2 batteries, manual, CD - OS: Windows CE - Display: Color LCD - Country of manufacture: Japan Thank you for viewing.