But they aren't perfect for everything. The best choice depends entirely on how fast a device drains power.
When Rechargeables are WAY Better
If a device drains its batteries in less than a few months, go rechargeable.
While they cost more upfront because you need a charger, a single rechargeable battery can be reused 500 to 1,000 times. You usually break even after just 5 or 6 charges.
- Video game controllers (Xbox, etc.)
- Wireless mice & keyboards
- Kids' motorized toys
- High-power flashlights
Why they win here: High-drain gadgets make disposable batteries lose power fast. Rechargeable batteries (like NiMH) are great at giving steady, strong power until they are completely empty.
When Disposables are Actually Better
If a device uses barely any power and a battery lasts for a year or more, use disposables (Alkaline).
Rechargeable batteries have a habit of "self-discharging"—they slowly lose power just sitting on a shelf, even if the device is turned off. Disposables, however, can hold their power for up to 10 years without leaking.
- TV and AC remotes
- Smoke detectors (where you need 100% reliability for years)
- Wall clocks
- Emergency earthquake/disaster kits