trickle charge low capacity 2.4v NiMH batteries?

[hank]

I’ve slowly accumulated a handful of wireless phone batteries, all shrinkwrapped 2.4v NiMH packs with the little red/black wire plugs.

They’ve still got some capacity, not enough to allow leaving the dagnabbit handsets off the base overnight — but plenty to drive single 5mm LEDs.
And the LEDs plug nicely into the red/black plugs.

Handy for little emergency/path/marker lights, not to mention Hallowe’en ghosts etc.

Can anyone suggest a simplest possible trickle charger for these batteries?
They’re low capacity — rated 300 mAh to 800 mAh

I’d like to leave them with a low powered solar cell charging on windowsills for occasional use.

(I realize these are just 1.2v AAA cells — I just don’t want to tear the packs apart, if I’m going to use them.

[EasyB]

3 Si solar cells in series, so ~3V, with an appropriate resistor to limit the current to 50 or so mA?

[dchomak]

Check out how I experimented with some very old NOS cordless phone batteries. I was able to bring the capacities back up with my OPUS.

Reviving New Old Stock (NOS) NiMH AA cells

Over the last week or so I spent some time experimenting with some new old stock nickel metal hydride AA cells that I had come across. About 10 years ago or so, before there was a BLF, before I even knew there were others just like me, I was just a lone wolf in the wilderness enjoying my passion for flashlights and rechargable cells. Back then, to me, Nickel Metal Hydride cells were the upgrade to the old NiCd cells that I was using up until then. Of course they were expensive and I was always …

[hank]

I haven’t found Si solar cells as EasyB suggested (except out of stock listings)
but I did just find this: MEGAJUDI303 : Slot88 Slot Online Gacor Maxwin Pulsa Tanpa Potongan
so if that spec is accurate (I think my cheap little DMM can tell me), I’d just want a resistor to drop 160mA to around 50mA

I’ll try the cycling dchomak suggested on my old Maha MHC-9000, which can cycle cells.
Hm, when I have old packs with two or three NiMH spot welded together, can I treat them as independent — put a magnet connecting wire on the plus and minus pole of one cell, connect that with wires to a charger, and just ignore the other cells since they’re ‘dead end’ not connected at both ends?

[hank]

OK, uh — how do I modify this 3v 160mA solar cell.
Can I just hook it up to a 2xAAA NiMH pack and check the temperature?

EDIT, one day in direct sunlight, didn’t make the 2xNiMH pack feel hot, and the voltage is above 2.6v after resting overnight.

I guess this will do for emergencies (when we need the home “wireless” phone to work and the AC power is out)

ALso the little telephone battery packs have small plugs that accept 5mm LED legs and light them up fine for emergency lighting.

So, salvaging works.