The top of Husqvarna's battery range and the first of its cordless saws aimed squarely at 50cc gas work: 4.3 hp at the output shaft, 79 ft/s chain speed, a 20-inch maximum bar, and full-size .325/.050 chain instead of the narrow .043 the smaller battery saws use. That chain choice is the tell — it is specified for real wood rather than brushing. The 8.82 lb bare tool is heavier than anything else in the battery lineup and roughly 2 lb over the 540i XP, which is the cost of the extra output. Launched alongside the fuel-injected 564 XP as Husqvarna's pro flagship pair. The number that decides it is $1,310 for the kit with a 9Ah 40-B330X and charger, against roughly $750 for the gas 550 XP Mark II: you are paying a $560 premium for no fuel, no fumes and far less noise, and a first-generation design with no field record yet.

Best for: Professional crews replacing a 50cc gas saw with battery for noise-restricted or indoor-adjacent work and willing to pay the premium.

Specifications

Engine class: 40cc class (placed by shipped bar length)
Voltage: 40 V
Kit battery: 9 Ah
Bar length: 16 in
Bar range: 13-20 in
Single-pass cut: about 14 in (bar minus 2)
Chain: .325" pitch / .050" gauge (X-Cut C33; .058" C35 option)
Weight: 8.82 lb, tool only, without battery or cutting equipment
Power type: Battery
Use case: Professional
Warranty: 2-year commercial (Husqvarna limited)
Model: 550i XP

Manufacturer figures except the engine class and single-pass cut, which are derived here. What each spec means

4.3 hp, 20-in max bar
Full-size .325/.050 chain
Husqvarna's top battery saw

Where it is strong

4.3 hp and a 20-inch maximum bar — the only Husqvarna battery saw rated for 50cc-class work
Full-size .325/.050 C33 chain rather than narrow .043, so chain stock is cheap and everywhere
79 ft/s chain speed matches the pro gas saws for cutting speed
Ships as a kit with a 9Ah 40-B330X and charger, so the quoted price is a working setup
BLi-X packs carry across Husqvarna's whole professional battery range

Where it falls short

$1,310 against roughly $750 for the gas 550 XP Mark II — a $560 premium for the same class of cut
8.82 lb bare is the heaviest saw in the battery range, around 2 lb over the 540i XP
Runtime on one 9Ah pack is the real constraint; a full day needs a second pack and more money
New enough that there is no owner-reported durability record to check

Written from the spec sheet and the maker's documentation; owner reports for this model were too thin to summarize.