Since electric CS (chainsaws) have 0.043" vs. 0.050" (or larger 0.063") chains, it is not unreasonable that the chain will stretch sooner, therefore, checking and adjusting chain tension is more important on the narrower kerf chain systems. With the narrow chain comes the narrow bar, which is going to be easier to twist/bend; which makes proper chainsaw technique important as well.
When comparing gas and electric, you are gaining all the benefits (no pre-mix, less noise, etc.) but there is an associated cost (check adjust chain more frequently, pay more attention to operator technique, etc).
My problem is that the chain is still too loose, even after tightening it all the way.
I've tried with the chain adjust dial, and with the screw. In both cases, it's still loose.
I can see where the nob has moved all the way to the end of the slot, so it cannot be
tightened anymore. I've had the saw for about four years.
The bar itself is new. Does a chain stretch a lot over time?
Adjusting The Chain Tension
Stop the motor and remove the battery pack before adjusting the chain tension.
Loosen the side cover knob.
Turn the chain-tensioning knob clockwise to tension the chain. See the section: “REPLACING THE BAR AND CHAIN” in this manual for additional information.
◾◾ A cold chain is correctly tensioned when there is no slack on the underside of the guide bar and the chain is snug, but it can be turned by hand without binding. The chain must be re-tensioned whenever the flats on the drive links do not sit in the bar groove.
◾◾ During normal saw operation, the temperature of the chain will increase. The drive links of a correctly tensioned warm chain will hang approximately 0.050 in. (1.3 mm) out of the bar groove (Fig. 28).
NOTICE: New chains tend to stretch; check chain tension frequently and tension as required.
NOTICE: A chain tensioned while it is
warm may be too tight upon cooling. Check the cold tension before next use.