Here's an option....
Okay I'm surprised I no one has discovered this yet (that I've heard/seen/read)
If you were a previous Samsung Instinct owner, like I was, you are in luck!!! Because you have an external battery charger, and one or two extra COMPATIBLE batteries.
I was just sitting around tonight and picked up my phone (minimal use today) 15% battery
Well there was my old instinct external charger and battery sitting there staring at me, seemingly taunting me. Knowing that the instinct battery was very similar in shape I got kind of curious.... So I powered off, took off the back plate, took out the Moment battery, and slid the Instinct battery into place. Wow... kinda fits, doesn't really move around much, surely it wont work... Turned the phone over, held down the power button for a couple seconds... SAMSUNG.... IT WORKED! I let the Andriod OS fire up and the battery meter read 60%... not bad, considering the battery hasn't been touched for almost a month.... but, maybe a distorted read since its a different battery (less mAh)
Well, surely it will fall out of place with ease and the phone will power off rendering it useless. I refixed the back plate and shook the phone around. Still on. Dropped the phone on the carpet from about 3 feet up. Still on. Put it in my pocket and ran in place for a few seconds. Still on. Battery meter still at 60%
I haven't done any type of battery life test yet, but as far as I'm concerned this will be HUGE in the way I use my phone. No more "Conservative Mode" which I feel like I'm always forced to be in, because of its crappy battery life. Now I have 2 backup Instinct batteries, one of which can be charging while the other is in use.
So, while this is no official battery fix, or an appropriate external Moment battery charger, it should definitely help some folks.