Reddit mentions of LandFox Battery Holder, 3 x 3 AAA Battery Holder Spring Box for Flashlight

Whatever you do, don't buy any plastic flashlights. If you wanna buy some flashlights at a reasonable price, try getting some Maglites. They can be serviced if need be and will last a long time. If I can't afford expensive flashlights at the moment and would need to buy a bunch of them, Maglites can be purchased on the fly at the box stores.

But if you want the real deal, then get a state-of-the-art tactical flashlight that can fit inside your pocket. ThruNite, Nitecore, Fenix, and Convoy are the kings of flashlights. Personally, I recommend the Thrunite TC12 V2 as the reviews on this flashlight praises its durability and reliability. Not too many people had trouble with this flashlight, except with the V1 because people complained about cycling through modes to get to the one they want.

Since power is an issue. Rechargeable batteries are the way to go. 18650 Lithium batteries will last you 500 charges, but you can pick up rechargeable batteries in AA, AAA, C, and D-Cell Nickel Metal Hydrate as well. Since the flashlight kings have torches that run off of 18650, there are adapters that you can use in case you can't get a hold of them. If you want to stick with primaries and AA/ AAA batteries, then get Energizer Ultimate Lithium cells. They're pricey but they last a long time and can be stored up to 25+ years.

Since this is a third-world nation you're sending these lights to, then USB rechargeable lighting an absolute must. If you want true independence, get a solar charging kit, portable energy storage, and a USB rechargeable battery system. You can use the solar panels to charge your flashlight and your rechargeable batteries without ever using the power grid.