My new Olympus compact uses their LI-90B type battery, and didn't include a charger. I have a number of LI-50B batteries from previous cameras, as well as a couple of chargers for them. Aside from a slightly higher capacity (1270 vs. 925mAh), the new battery type also gives its voltage as 3.6v, as opposed to 3.7v.
The charger I have (LI-50C) gives its output as 4.2v 700mA, and accepts the slightly thicker batteries after breaking off a plastic lip over the contacts that the thinner ones slid beneath.
I did one experimental charge this way, and found that the in-camera charger wanted to charge the battery for another ten minutes or so.
My question, then, to someone with insight into the subtle aspects of lithium packs and their chargers, is whether there could be any long-term deleterious effects to the batteries from doing this?
Could the charger be switching from CC to CV at the wrong point in the charge, for instance, given the numbers above? I have only a crude understanding of the process. Given the inflated price of OEM chargers, I'd be happy if I could continue to get some use out of the ones I have.