Independent buying guides plus a set of tools that answer the real question - “which one do I buy for my stuff?” No fluff, no fake 9,900 mAh ratings.
Each guide pulls together real specs, independent test data, and community consensus - not marketing copy.
From a simple AA smart charger to analyzing chargers that measure true capacity. What to buy and what to avoid.
🔋Eneloop vs. Pro vs. IKEA LADDA vs. USB-C lithium - which AA cell is right for remotes, flashes, or the whole house.
🔋The small cells that power your remotes, headlamps, and toys. Capacity is tiny here - picking right matters more.
Free habits and built-in settings that add years to the battery in your phone, laptop, tablet, and every cell you own.
The 20-80 rule, overnight charging, the charge limits to switch on, and storage - so your laptop, phone, and tablet last years longer.
🌡️What actually ages a lithium cell - heat and a high charge level - and the simple habits that slow it right down.
🩺Find battery health and cycle count on iPhone, Android, Windows, and Mac - and know what the numbers really mean.
⚡Ditch the bundled brick. USB-C Power Delivery, the wattage each device needs, and one charger to run them all.
📷Cameras, handhelds, and media players each take different cells. Match the right battery and charger - and buy loose lithium safely.
📚Every VoltRated buying guide and battery-care guide in one place.
The Bench is where the guesswork gets settled - match a charger to the cells you own, look up what really replaces a battery code, and run the maths without trusting a random forum post.
Answer three questions about the cells you own and get a ranked shortlist, with the reasoning shown.
🔍What actually replaces an LR44, CR2032 or AG13 - plus the lookalikes that will damage your device.
🧩Will this charger safely charge these cells? Check before you plug in - chemistry is the one rule that bites.
🔋AA and AAA cells sorted by capacity, cycle life and the cost per cycle that actually matters.
📈Convert capacity to energy, and check a power bank against the 100Wh airline limit.
🧰Runtime, charge time, the series/parallel pack builder, and everything else on The Bench.
We don't run a lab - we do the digging. The best independent test data, manufacturer specs, and years of community consensus, gathered and compared into clear picks so you don't have to wade through it yourself.
Quick answers to the questions we get asked most. For the full picture, dig into the guides.
For anything you use regularly - remotes, controllers, flashlights, camera flashes, toys - yes. A good rechargeable cell can be charged hundreds of times, so it pays for itself quickly and creates far less waste than disposables. For very low-drain gear you touch once a year, disposables can still make sense.
NiMH cells are the rechargeable AA and AAA batteries that replace disposables in everyday gear - robust, affordable, and safe to handle. Lithium-ion cells (like 18650s, or the battery built into your phone and laptop) pack more energy for their size and power high-drain devices, but need more care and the right charger. The two charge completely differently and must never be swapped into the wrong charger.
A quality NiMH AA or AAA can handle several hundred to over a thousand charge cycles across years of use. Lithium cells are usually rated to keep about 80% of their capacity after roughly 500 to 1,000 cycles. Heat and sitting at a full charge are what wear them down fastest - see what ages a battery.
No. The charger has to match the battery chemistry, and a good one watches each cell individually and stops at the right point. Cheap chargers that blast high current and never terminate properly are the quickest way to ruin cells - our charger guide covers what to buy and what to avoid, and the compatibility checker settles a specific charger-and-cell pairing in one click.
mAh is capacity - how much charge a cell holds - so a higher genuine figure means longer runtime. But mAh only compares fairly between cells at the same voltage, which is why watt-hours is the honest measure. And the ratings on cheap cells are often wildly inflated: a bare 18650 claiming 9,900 mAh doesn't exist, since real capacity tops out well under 4,000 mAh. Trust independent measurements over the number on the wrapper.
Somewhere cool and dry, away from heat and direct sun. Store lithium devices and cells at around half charge rather than full or empty, and top them up every few months so they don't discharge too deeply. Never carry loose cells where they can short against keys or coins - use a case.
Informational only. Lithium and NiMH cells can be hazardous if misused - follow manufacturer instructions, use the correct charger for each chemistry, and never charge damaged cells. Prices and specs are approximate and change often. Informational only, not commercial advice.