Efficient, integrated level indicator ...

For reasons of economy and ecology, I mainly use rechargeable batteries. But some devices (smoke detector, eg remote control, but mostly headlamps) are more "safe" with conventional batteries.
A headlamp camping is better without the risk of "failure" stack, and not easy to carry the battery charger ...
In short, even being major consumers of rechargeable batteries, we practice regularly conventional batteries, preferably VERY long.

Duracell are among my favorites batteries because they actually have a long duration.
these batteries will have two more "gadgets" that have seduced me personally:
- The storage box seemed gadget ultimately it's more convenient to keep the batteries in a non suitable and reusable packaging: more batteries that disappear into the tray ...
- Powercheck or the charge level check warning is a real "plus". No risk of being empty without having anticipated so no need to always take spare batteries in case ...

Why only 4 stars?
Because I expect rechargeable batteries as effective!