USB charger ecology

Batteries and Chargers Chargers
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Had some very useful advice on this forum about headlamps so thought I’d share the following, more complex query. Sorry for any headaches resulting. All input gratefully received.

Context: I want to assemble a reliable, backpackable set of electronics. I’m careful with my gear but shock and water resistance is good.

I have a small effective solar panel (Ryobi, 14w) with two USB-A ports. On a sunny day it will power both of them at 4pointsomethingV and nearly 1A.

I have a low-power cellphone that charges happily from USB-A, a couple of rechargeable flashlights similar, a crank radio that can be hooked straight to the panel when I need news, and various tried-and-true devices that run on AAA batteries.

I plan to replace the existing slew of AAAs with Eneloops ie NiMH.

I figure that the way to get max use out of all this carefully-assembled tech is to buy i. a lightweight powerbank that fits into the zip-up wiring compartment in the Ryobi and ii. a USB-powered two-slot smart charger that can handle the Eneloops. I can then charge the powerbank and two AAAs or a flashlight simultaneously in the day, and charge the phone from the powerbank overnight.

I like the Klarus K5 for the powerbank but I haven’t settled on a USB AAA charger. And someone might suggest another approach?

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Is this acceptable to charge your AAAs?

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Thx for suggestion. I’m thinking better (smarter) charging, dead battery re-set and Li-ion/NiMH switching, like eg LiitoKala Lii-S2. But there may be something even better. I didn’t finish reading lygte-info.dk yet.

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PS A further twist: I found a perfect set-up but it would rely on a no-longer-available item, the (v1.0) Black Diamond Revolt headlamp.

Here’s the story: my phone, flashlights, head lamp and camp radio are all fine – they’ll charge straight off the panel, or a waterproof powerbank. The weak spot is my slew of AAA-powered items, which mean carrying an extra USB charger that wasn’t designed for trail use.

Turns out that Black Diamond used to make a decent 3xAAA headlamp with a USB port that enabled it to double as a battery charger. Plus it’s IPX8 waterproof. Perfect for my purposes, but long out of production.

Maybe I’ll luck out and find old stock…