D型電池

Got these for the flashlight that eats regular batteries in a week, and they're holding up way better with the high-drain draw. The LR20 size fits perfectly, no fiddling with the contacts.

These D cells have powered our kids' toy train for two weeks straight without any drop in performance. For high-drain stuff like that, they're clearly holding up their end.

The contacts on these D cells are nice and tight, so my flashlight stopped flickering. It’s kept the LED bright for about a week of daily use so far with no drop in power.