Time to embrace the "new" battery technology

[tomato]

My Pulsar dome is currently powered by a 14 month old 12V 13Ahr Lead acid gel battery. The most recent imaging session aborted due to low battery volts after about 4 hrs, this is a safety feature to ensure there is always enough power left to safely close the shutter. @Tomatobro put it on test with a 1.9 amp current drawand here is the result:

So I have finally embraced 21st century battery technology and ordered an equivalent LiFePO₄ battery, inc charger. Over double the price of the LA variety so it looks like the scarcity of UK clear sky is now pushing up other indirect costs of imaging. 

[symmetal]

I'm more concerned with why your battery is called Steve. 🤔

Alan

[Tomatobro]

 "Gene, from my chair the Odyssey is dying".

[symmetal]

"Sy, you're making a crisis out of a drama."

[Carbon Brush]

The 12V to 11V 'step' indicates one cell (of six) has shutdown early.
Equal performing cells would give a gradual voltage decay.
A bit of unexpected bad luck if it was a known brand.
Definitely battery to the bin.

You should find the lithium battery is good for providing high current.
The other good news (given UK weather) is lithium performance degrades gradually with charge/discharge cycles. not the calendar.
In addition, the self discharge is far lower than lead acid.

A good choice for the replacement.