This Logitech T650 touchpad hasn't been used/charged for probably 5 years. Stored indoors. No heat exposure or freezing temps. It was likely at half or less charge when last used. Battery is
t650 Wireless Rechargeable Touchpad
Gestures and multi-touch: Logitech T650 – frans goes blog
Review: Logitech Touchpad (T650) – getwired.com
Logitech Wireless Rechargeable Touchpad T650 touch pad Black