Abstract: A method, a controlling unit and an electronic charging arrangement for determining a state of charge of a battery (205) during charging of the battery (205) are presented. The method comprises charging (110) the battery (205) with a charging current (410) during a first time period (T1), interrupting (120) the charging current (410) after the first time period (T1) at least for an interruption time period (T2), determining (130) a change (480) of terminal voltage (420) of the battery (205) during the interruption time period (T2), and determining (140) the state of charge based on the determined change (480) of terminal voltage (420).

Abstract: A helmet comprising a first protective layer, the first protective layer comprising at least one accessory mount portion for receiving an accessory mount or an accessory, the at least one accessory mount portion being arranged integrally as a part of the first protective layer and configured to disintegrate from the rest of the first protective layer in response to a mechanical impact to the at least one accessory mount portion for preventing the accessory mount portion and/or the accessory from penetrating through the helmet.

Abstract: A helmet comprising a first protective layer, the first protective layer comprising at least one accessory mount portion for receiving an accessory mount or an accessory, the at least one accessory mount portion being arranged integrally as a part of the first protective layer and configured to disintegrate from the rest of the first protective layer in response to a mechanical impact to the at least one accessory mount portion for preventing the accessory mount portion and/or the accessory from penetrating through the helmet.