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Yes. The first step is to open the battery and check the condition of the wiring for breaks, corrosion, etc. Also check the condition and voltage for the individual 18650 cells. Ryobi batteries are relatively easy to disassemble using available tools, see posting below. https://www.ifixit.com/Guide/Cell+Re-balance+of+Ryobi+One%2B+18V+Li-ion+Battery+%28130501002%29/13286 Depending on the findings, some parts may need replacing. If you replace the 18650 cells, use new ones which are easily found on eBay.
The battery cells inside lithium ion batteries (and other types of batteries) tend to corrode if they become wet for a given period of time. They need to be dried out immediately to avoid corrosion. Unfortunately, it seems like it is too late to dry out yours. Your battery will need to be carefully disassembled using procedures on fixya and the corroded cells replaced with similar quality cells. The cells in Ryobi batteries are spotted welded in place and these welds need to be broken carefully using a Stanley knife. Replace the cell(s) with new ones or from other disassembled batteries and solder them in place. Check for cell voltage imbalance (see other solutions on fixya) and reassemble. Good quality Panasonic Li Ion cells can be purchased for about $4 each on ebay. If you go this route, I would recommend replacing all cells, not just the corroded ones.
No, the P110, 18V NiCad battery charger, will not charge a 18V lithium ion battery. You need one of the dual-chemistry chargers. If you have the Ryobi ONE+ batteries, you can get the P117 charger ($30) or a charger with an extra battery (P126) from a store like Home Depot. A 6 battery charger and a 12V in-car charger are also available.
I wish that I had better news for you.
Cindy Wells (who has the Ryobi 12V drill and charger, a few of the 4V tools, and a number of the ONE+ 18V devices and chargers. The single chemistry battery charger is not used much any more.)
Rebuilding the Lithium batteries is a waste of time and money. For starters the cells cost a minimum of $5 ea and a low power pack takes 5, so now you are in for $25 without doing any work. You can pick up packs on eBay for around $30 - $40 if you shop around. If you know what you are doing, you can strip cells from bad packs and test them to find good ones and then rebuild with those. It can be tricky and you may get mixed results.
I believe this is a two cell lithium assembly for 2.4V. If your handy and can open the pack without damage it may be possible to get replacement cells and rebuild the pack.
I think the Che-ez brand went out of business a few years ago and there is no hope to buy a replacement battery from the market. This solution only works if you have the original Li-Ion battery with you, as the plastic frame is needed to re-build it. Strip the outside labels on the non-working battery by hand to expose the battery cell pack and the overcharge protection PCB (circuit board). With extreme care, unsolder both off the plastic frame from the inner side of the battery's electrical contacts. Go on ebay and buy a generic Li-Polymer cell pack (search "Lithium Polymer Battery 3.7V 380mAh for MP3 MP4 SAT NAV"). Again with extreme care solder the two wires sticking out of the new battery pack back into where the old cell pack came off (check polarity carefully). It is a bit oversized but it will still go into the battery slot without much problem. If you have done even right, you should now have a working camera again.
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