Isopropyl alcohol and a stiff brush are all you need.

Pretty simple, really. Battery-powered chainsaw contacts get grimy from sawdust, sap, and general muck. If the saw starts stuttering or losing power, dirty contacts are the first suspect.

Pull the battery, wipe the metal tabs on both the battery and the saw with a cotton swab dipped in 91% isopropyl alcohol. Use a stiff nylon brush (old toothbrush works) on stubborn sap or corrosion. Let it dry fully before reassembling.

Don’t use sandpaper, metal files, or abrasive stuff. You’re not trying to remove metal—you’re trying to remove gunk. Scratched contacts just collect crap faster.

Do this every few tanks of fuel (or every time you swap batteries, if you’re using it a lot). Lithium-ion batteries hate dirt and poor connections. A thirty-second wipe keeps the saw from dying mid-cut on the branch that’s about to drop on your head.

Future You will appreciate not having to jiggle the battery to get the saw to run.