deviceref=unique identifier of the device whose battery charge condition is given — compulsory
tankref=unique identifier of the tank where the device (e.g. a tank pressure sender) is attached to — optional
<batterychargecondition> indicates the battery charge condition of a device whose unique identifier is given as an attribute at the respective <waypoint> in percent of full capacity as a real number. A value of 1.0 means full charge condition of the battery (according to 100 %). 0.0 indicates a stone-empty battery. The attribute must be given.
If the device is a tank pressure sender, an additional attribute indicating the identifier of the tank must be given, too. This is necessary for knowing the gas whose pressure the sender is measuring.
see also <waypoint>
<!-- battery charge condition of dive computer with ID "my_divecomputer" - 86 % --> <batterychargecondition deviceref="my_divecomputer">0.86</batterychargecondition>
<!-- battery charge condition of tank pressure sender with ID "sender_1" --> <!-- attached to tank with ID "steel_nitrox4060" - 47 % --> <batterychargecondition deviceref="sender_1" tankref="steel_nitrox4060">0.47</batterychargecondition>