last updated 2 Nov 2019

Time on high
Dyson V8 Animal | Dyson.com 
Spec: Max - 7 min; Extended Run - 40; Extended with motorized head  - 25
Charge time 5 hrs.

Tests
New vac  8.5 min. on Max w/ motorized head
        5:10 to charge

Replacement batteries 2.8 Ah replacement from dyson $130 4.5 Ah Jialitt $55 4.5 (33) 1.05 lbs Most reviews said it was better than original Several failed right away. 1 didn't last any longer. 4.5 Ah TenHutt $56 4.1 (44) 1.06 lbs unavailable 4 Ah Powerextra new - no reviews replaced battery with 4.1 (50) $50 1.4 lbs 3.5 Ah Briswaye 4.4 (81) $50 Reading hundreds of Amazon reviews for the many available. I settled on Biswaye - and 10 weeks in, I could not be happier. I've only used it a couple times, but I can now vacuum every part of my house that I need to on HIGH. That was difficult to do with the standard battery. 3 negative Melted OK for 1 month then only runs for 30 sec