Sorry, I should have worded that better, I have experience with Na in a birch, but due to a lack of it ATM, I was contemplating Li, hence the batteries.
I am not looking for a source per se of batteries, but the best source of Li. I can source those expensive little fuckers that are blue and silver easy. But was curious as to whether that is what other Ozzie birch bees use? Or if their are better sources of lithium in some obscure use. PM if you like.