NI-MH battery pack and charging help please?

Hi all, I need to power an LED to about 4 amps in a small flat space, so I was thinking about getting these 3x AA nimh packs Pololu - Rechargeable NiMH Battery Pack: 3.6 V, 2200 mAh, 3x1 AA Cells, JR Connector

What I need to know is how can I charge a bunch of these packs fairly easily? I need to charge about 10 of them at a time? I was thinking about just getting a fist full of USB type chargers, but I don’t even see any of those with that “JR” type plug on it.

Any suggestions would be appreciated. I’m not dead set of the packs from pololu if there is another source I can get quality packs from quickly I would change to whatever.

Why not 14500?

Are you charging exact same amount of packs each time, or random number every time?

Hi all. I Found what I needed. I ended up just going with Lipo packs. Even though they have much lower relative capacity they gave me enough run time, and I can get chargers that will power several of them using JST connections.