You're doing better than me - but batteries do work better if you use the tool, have a short period for the cells in the battery to re-equalise and then use it again. This is the cordless grinder thing, it shuts down and give it 5 mins and you can get another 5-10mins out of it. Start it straight up again and it'll turn straight off again.
My best effort on a cordless saw is using a battery, plugging in the second and then having to grab lunch while I wait for the first to charge. But that is literally continuous cutting only stopping to fill the bar oil and tickle the chain, on Avo prunings piled up ready to go for bucking. In that scenario, a petrol saw is better simply because you can 'recharge' it quicker over the course of the job (although it takes less time to swap a battery). Avo is a little unique in that it's usually soft enough that it doesn't dull chains much at all. I can (or could before I did the ribs) do about 8m3 of avo in half a day bucked, it takes a lot longer on the splitter though. Quicker to put the saw through some bits than split them, knotty crap in the crutches.
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