Shearwater Swift Battery shows half depleted after only a few minutes of use

[Mobulai]

I started carrying a voltmeter in the save-a-dive kit!

Always helpful around oxygen cells as well

 

[bvanant]

Voltmeters are the best part of useless, especially for Li cells. Their discharge curves are terribly non-linear like this, but a Load Tester (battery under load is useful).
Bill

 

[TNEngineer]

I started carrying a voltmeter in the save-a-dive kit!

I carry spare batteries. A voltmeter has near-infinite input impedance (by design) and so does not give an accurate indication of battery health while under load. If a battery is questionable, replace it.

 

[Divin'Papaw]

I carry spare batteries. A voltmeter has near-infinite input impedance (by design) and so does not give an accurate indication of battery health while under load. If a battery is questionable, replace it.

SWIFTs are a PITA to change the battery on a boat. Doable in a hotel though. I choose to handle the risk of a dead battery by always having a spare MH8A transmitter with me. 1-2 min to swap transmitters on a boat or in a hotel room.

 

[greeniguana]