Digex and Thermion models ranging from £1000-£6200 in price , average spare battery price £36-£39 , when your spending thousands this cost is paled into insignificance against the product cost.
Telos model batteries are £100 just over, but do not require a charging dock, can be wireless charged and last about 10hrs each. Again the units cost thousands.
Pulsar batteries are high quality / capacity , plus they have integrated battery management within the battery itself. If you use the pulsar dock system and you ever get a battery that doesn't charge, insert into the dock and then quickly remove and replace normally resets and you should see the battery sort of reboot and charge.
It also prevents users putting any old battery into the device, like some of the cheap chinese types that can pose issues... They are expensive but fully sealed and have various safety features, temp cut off, etc built in. Plus if there in your pocket they won't short on keys or coins like a rogue 18650 could... plus you have 12 month warranty.
