Hi there I have here my sons boost battery from his oset 16r bike, it charges up and I would say lasts around  1 hour and 15mins  running time,  they are a brilliant upgrade to the oset bikes as they are lighter and last a lot longer than standard, it is dated 2020 and in truth It should probably last a bit longer than it does like 2.5 hours but is still a lot better than Any  standard oset battery.  We bought a different boost one from  a friend that hed only used a spare so this is for sale. The chargers on there own are around £80 and new boost batteries are around £500 so grab yourself a bargain, we would like cash on collection only from near Northallerton, North Yorkshire. Any questions can call me or on here 07719919949. I'd rather not post it as there still pretty heavy. Please note this is only for the oset 16 model i believe the 12.5 and 2.0 will have different size  batteries.