Nobody buys their second chainsaw for the reason they bought their first. The first is an impulse after a storm drops a limb on the shed. The second is because the first couldn't hold a charge, didn't fit the batteries already in the garage, or wore a bar too short for the oak that came down. So let's skip to the second one. A battery chainsaw really comes down to two questions: whose batteries you already own, and how big the wood is that you actually cut.
Platform first, because that's where your money quietly goes for years. The saw is a one-time hit. The batteries are the subscription. If you already run EGO in the yard, a Milwaukee kit on the jobsite, or a drawer full of DeWalt yellow, buy the saw that shares those packs and spare yourself a second charger shelf. What crosses and what doesn't, fast: Milwaukee M18 and M12 don't mix, Makita's 18V LXT and 40V XGT live in separate worlds, and a Ryobi 40V pack won't drop into an 18V ONE+ tool. DeWalt plays nicest, because a 60V FLEXVOLT battery steps itself down to run your 20V MAX gear, though a 20V MAX pack still can't power a 60V saw. Physics, not stinginess.
Coming in cold: EGO CS1804
No existing platform? This is the saw to hand a neighbor. The 18-inch bar covers what homeowners actually meet, downed branches, storm cleanup, a winter's firewood, and the 56V 5.0Ah battery sits right in the sweet spot between runtime and arm fatigue. Brushless motor, tool-free tensioning, and the same packs power EGO's mowers and blowers, so the battery spend spreads across the whole yard.
It isn't light. With the pack in, overhead limbing will remind you that you skipped the gym. Down on the ground, bucking and felling, it's tough to fault.
When the bar's too short: EGO CS2005
Same battery, bigger reach, the bar stretches to 20 inches. In independent testing it ranked among the quickest cutters in its class. The catch is honest: roughly 19 pounds with the battery, which is a lot of saw to wrestle anywhere but flat ground. Buy it only if you routinely meet trunks a 16-inch bar can't swallow. Most people stay happier with the lighter CS1804 and never feel the loss.
Already loyal to a brand
On DeWalt, grab the DCCS670. Sixteen-inch bar, 60V FLEXVOLT, around 12 pounds, lighter than the big EGO, brushless, tool-free tensioning. And since those FLEXVOLT packs also feed your drills and drivers, nothing sits dead in the truck.
On Milwaukee, the 2727-20 M18 FUEL punches above its voltage in a way that mildly irritates the 60V crowd. Pair the POWERSTATE brushless motor with a High Output 12.0Ah pack and an 18-volt saw keeps up with the big numbers. It ships as a bare tool, so if you don't already own a fat battery, price one in.
On Makita, the XCU04 takes two 18V LXT packs rather than one giant one, which is exactly the point if your shelf already groans with LXT. Smooth, quiet, quick to brake. Just keep a second pair charged, because it needs two batteries to spin at all.
On a budget: Ryobi RY405010
Want light limbing and the occasional small round without emptying your wallet? The Ryobi 40V HP is the value play. At about 8.4 pounds it's the easiest saw here to swing for an afternoon, and the brushless motor manages up to roughly 128 cuts per charge on the included 4Ah battery. The 14-inch bar caps how ambitious you can get, so this isn't your storm-recovery weapon. For tidy-up duty, it's plenty.
The two specs people overlook
Chain speed and the oiler decide whether a saw cuts or just chews. Faster chains, rated in feet per second, throw less dust and finish before the motor bogs. The oiler keeps the bar greased so the chain glides; an automatic one handles it for you, an adjustable one lets you crank up flow for dry hardwood. Every saw above has one. Glance at the oil window before each session anyway, because a dry bar is the single most common reason a perfectly good battery saw suddenly feels gutless.
A cold-weather gotcha, while we're here: lithium packs won't charge below about 32F, and a charger may blink or flatly refuse a frozen battery. That's the cells protecting themselves, not a defect. Warm the pack to room temperature and it charges fine.
Which to buy? Coming in with no batteries, the EGO CS1804, no hesitation. Already committed to a color? Match the saw to the packs you own and skip the second charger collection entirely.