I’ll never forget the day my cordless chainsaw died halfway through bucking a 14-inch maple log. I had a fully charged battery pack in my hand, the voltage sticker said 40V, and the connector slid in perfectly. What I didn’t know at the time was that underneath the plastic housing, the actual cylindrical cells inside that pack weren’t built to handle the brutal current spikes a chainsaw demands. The pack overheated, the BMS shut everything down, and I learned a hard truth: understanding battery requirements for cordless garden tools means looking past the voltage number and into the cells and pack architecture itself. At OneAndes, we believe matching the right battery to your mower, blower, or chainsaw is the single most important decision you can make for performance and longevity.
What I’ve come to realize is that every “battery” we use in outdoor power equipment is actually a carefully engineered battery pack, built from multiple cylindrical lithium-ion cells wired in series and parallel. The type of cell, its size, its discharge rating, and the way the pack manages voltage all determine whether your tool will sing or sputter. Let’s walk through the building blocks—from individual cells like 18650, 21700, and 26650 batteries all the way to complete NMC battery packs in voltages from 12V to over 60V—so you can choose with confidence.
The Foundation: Cylindrical Lithium-Ion Cells
If you crack open any cordless tool battery pack, you’ll find rows of metal-can cells. These cylindrical batteries are the atomic units of portable power, and their size designation tells you a lot. Take 18650 batteries: 18mm in diameter, 65mm long. These have been the workhorse of the industry for over a decade. You’ll find them in countless 18V and 20V packs, and in some older 36V and 40V designs where many cells are bundled together. They’re reliable and widely available, but they have limits in high-drain scenarios—especially when a mower hits a dense patch or a chainsaw bites into hardwood.
The newer standard rapidly taking over outdoor power is the 21700 battery—21mm wide, 70mm long. The slightly larger can allows for significantly higher capacity per cell and, crucially, a much higher continuous discharge rate without excessive heat buildup. When we talk about modern 40V, 60V, and high-voltage packs that can sustain a blower at full throttle or a mower through a half-acre cut without sagging, you’re almost certainly looking at packs built on 21700 cells. For chainsaws especially, the ability of 21700 cells to deliver huge instantaneous current without voltage collapse is a genuine game-changer.
There are other cylindrical formats worth knowing. 26650 batteries (26mm x 65mm) offer even higher capacity and current capability in a fatter cell, sometimes found in dedicated high-capacity stationary packs or custom builds. Smaller cells like 18350, 14500, 14430, and 10440 batteries are typically used in compact electronics, portable lights, and niche tools—they lack the energy and power density needed for serious garden equipment, but they remain essential for smaller devices across the OneAndes catalogue. For a full look at the cell types we stock, from the minuscule 10370 to the beefy 26650, browse our Cylindrical Batteries collection. Understanding the cell inside the pack is the first step to knowing what your tool actually needs.
From Cells to Packs: NMC Battery Pack Voltage Explained
Individual cells are just the beginning. A finished Lithium-Ion (NMC) Battery Pack strings multiple cells together in series to achieve a useful voltage, and in parallel to add capacity and current capability. That’s why you see names like “40V NMC Battery Pack” or “20V NMC Battery Pack.” The nominal voltage of an NMC cell is around 3.6–3.7V, so a “20V Max” pack has five cells in series (5 x 3.7V = 18.5V nominal, marketed as 20V), while a “40V Max” pack typically has 10 cells in series (37V nominal). The real magic is how many parallel groups you add—more parallels mean more amp-hours and more muscle.
Here’s how the voltage tiers generally map to garden tools:
12V NMC Battery Packs (11.1V nominal) and 18V NMC Battery Packs (18.5V nominal): These are primarily for compact handheld tools and light-duty jobs. You might find a small handheld blower or a pruning saw that runs on an 18V platform, but for full-size mowers and serious chainsaws, these are underpowered.
20V NMC Battery Packs (21.0V max) and 24V NMC Battery Packs (22.2V nominal): A step up, often seen in consumer-grade blowers and small chainsaws with 10-inch bars. They handle light work but can struggle when pushed.
36V NMC Battery Packs (37.0V nominal) and 40V NMC Battery Packs (37.0V nominal): This is the entry point for walk-behind mowers and robust handheld blowers. A quality 40V pack with sufficient amp-hours can genuinely replace gas for many homeowners. This is where battery cell selection becomes critical—I’ve had 40V packs built on old 18650 cells fade quickly under load, while a pack using modern 21700 cells powers through without complaint.
48V NMC Battery Packs (44.4V nominal) and 60V NMC Battery Packs (55.5V nominal): Now we’re in serious territory. These packs drive large self-propelled mowers, backpack blowers, and chainsaws with 16-inch bars and above. The higher voltage reduces current for the same power output, meaning less heat and more efficiency.
High-Voltage NMC Battery Packs (>60V): Found in the most demanding commercial equipment and some ride-on mowers. If you’re running a professional chainsaw or a heavy-duty zero-turn, you’re likely in this realm.
Custom & Special Voltage NMC Packs: Not every tool fits neatly into a standard voltage tier. For OEMs, integrators, or specialized equipment, custom-voltage packs built to exact specifications are essential.
You can explore the entire range of pre-built voltage tiers in our Lithium-Ion NMC Battery Packs section. Whether you need a compact 20V pack for a blower or a beastly 60V pack for a mower, the right chemistry and cell configuration make all the difference.
Matching Packs to Garden Tools: Specific Demands
Now let’s tie the cell and pack knowledge back to our three key tools.
Mowers demand sustained high power and large capacity. A single 40V 4Ah pack built on 18650 cells might leave you with half the lawn uncut. A 60V 7.5Ah pack built on 21700 cells, however, can chomp through thick grass for over 45 minutes. If your mower uses a dual-battery system, matching two identical packs from the same production batch extends overall life—something we covered in our guide to maximizing lithium-ion battery life. For a reliable single-pack solution, consider the OneAndes 40V 5.0Ah Lithium-Ion Battery Pack. It employs high-drain 21700 cells and a rugged BMS specifically engineered for sustained high-torque applications like mowers and large blowers, with a built-in fuel gauge so you’re never caught off guard.
Blowers need high continuous discharge rates to keep impeller speed up. A 20V or 40V pack can work for handheld blowers, but if the pack can’t deliver steady high current, you’ll hear the fan speed drop as voltage sags. Look for packs labeled as high-output, which generally means 21700 cells inside. For professional backpack blowers, a 60V or even 80V pack in the 8Ah+ range turns clearing heavy leaves into a one-charge job.
Chainsaws are the most unforgiving. They demand massive instantaneous current when the chain meets resistance. A pack that performs fine in a drill might stall in a 16-inch chainsaw. This is where 21700 cells truly shine, and where higher-voltage packs (60V and above) keep chain speed high even under extreme load. The weight and balance also matter: a compact but powerful 40V or 60V pack keeps a top-handle saw maneuverable, while a larger pack suits a rear-handle firewood saw. Starting every tough cut with a freshly charged, room-temperature pack is a habit that will save you endless frustration, as heat is the enemy of both cell longevity and instant power delivery.
Building a Coherent Battery System
Once you’ve grasped the relationship between cylindrical cells, NMC pack voltage, and tool demands, the strategy becomes clear: choose a voltage platform that serves your most power-hungry tool, then select packs within that platform based on cell type and capacity. A 60V platform with packs ranging from 3Ah to 12Ah gives you the flexibility to put a light pack on a blower and a heavy pack on a mower, all while using the same charger. And when you need to replace or upgrade, checking whether a pack is built on 18650 or 21700 cells tells you volumes about its real-world capability.
For every option we’ve discussed—from bare 18650 cells for DIY projects to fully-assembled 48V NMC battery packs for heavy-duty mowers—visit our full Online Shop. We’ve organized the store so you can filter by cell type, voltage, and capacity, taking the guesswork out of matching batteries to your cordless garden tools. Get the battery requirements right once, and you’ll enjoy seasons of powerful, quiet, exhaust-free garden work with tools that feel truly unlimited.