Buy the right battery the first time.
Start with the platform you own, then compare capacity, genuine vs aftermarket trade-offs, and real cross-tool compatibility before you spend. Every guide states what we can and can’t verify — compatibility is never a safety endorsement.
Guide library
Where to start
Genuine vs Aftermarket Cordless Batteries: The Honest Truth
Aftermarket power-tool batteries cost a fraction of OEM packs — but are they safe? An honest breakdown of warranty, protection circuitry, fire risk, and when a cheaper pack actually makes sense.
Read guide →Milwaukee M18Best Milwaukee M18 Batteries (2026): Which Pack Actually Fits Your Tools
Every M18 tool takes every M18 battery, so the real decision is capacity, weight, and whether to go genuine or aftermarket. An honest guide to picking the right M18 pack for how you actually use your tools.
Read guide →Compatibility 101How to Read Cordless Battery Compatibility (So You Don't Buy the Wrong Pack)
Voltage labels are marketing, not a spec you can compare across brands. Here is how to actually read platform names, voltage classes, and connector shapes so you buy a battery that fits your tool.
Read guide →DeWalt 20V MAXBest DeWalt 20V MAX Batteries (2026): 20V MAX vs FlexVolt Explained
Every DeWalt 20V MAX tool takes every 20V MAX battery. The real questions are how much capacity you need, whether FlexVolt is worth the upgrade, and genuine versus aftermarket. An honest breakdown.
Read guide →Buying guideRYOBI ONE+ 18V vs 40V: Two Separate Battery Platforms Explained
RYOBI runs two batteries that don't share a charger: ONE+ 18V for drills, drivers, and 300+ indoor tools, and 40V for mowers and outdoor power equipment. Here's what actually determines fit, and where the two genuine packs in our catalog fit in.
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