My mp3 will not charge
Eh, probably keep the needles well stowed in the future, and a silicone plug (if you have some spare all-silicone caulk...) in the port at the Sansa's base. You can of course repair or replace the socket; the easiest way is to find the wiring correspondence on the charger cable to the USB port (using a DVM in continuity test mode...and needles, but little force) and concentrate on restoring the position of those contacts so it recharges, epoxying things into place.
Try posting a (link to a) photo of the port, if that's easy for you.
Using a charger for the battery that has you unscrewing it often sounds unsettling, but of course you can. Interstate Battery and such can probably let you on to what they use (it's probably what I see on eBay for $40ish when I search for Li Polymer battery charger .
The low-cost way is to look at the charger descriptions at linear.com (e.g. http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,C1078,P9551 or http://para.maxim-ic.com/search.mvp?fam=batt_chrg&hs=1 ) and buy that or a similar product and support components from an components vendor like Jameco.com or Electronics Goldmine, or a local store that has those things, building it to plug onto a spare USB header or port on a computer. You just want to match the charger type to the battery chemistry (LiMH or Li____ will be on the battery as a hint) and rely on the chip to handle all the charging current the smallish battery can take on.
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