Hi James,
Thank you for your review. We appreciate your feedback and will forward your comment to our supplier/manufacturer. Battery technology is a highly innovative sector and rapidly improving every year. Hopefully, our next versions will have much improved battery life. One more tip to prolong the life of the lithium-polymer battery in our collar and transmitter units: They should be charged fully at least once a month even if not in use. These batteries should not be drained to absolute zero as it needs to have a minimum amount of voltage or it will not charge up properly when plugged in. Hope this helps.
Wesley