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USB power?

I have a 1.2 V nimh battery and a 3.7V li ion (no protection circuitry) battery, which would add up to 4.9V if put in series. However, I want to turn it into a temporary USB power supply (5V) so ignoring all the things regarding putting 2 batteries of different capacities together, is there a way to kick the voltage up a tiny bit? I was thinking something like filtering the output of a joule thief, possibly. I also have a solar panel (4.5V, ???A) and was wondering if that could help, but I don't want to rely on it too much.

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Re-design6 years ago
4.9 volts would work for usb. I really don't like mixing the different voltages and TYPES.

Go to youtube and search "lithium fire" to see what I mean.

But nobody could tell me anything when I was young either.
Good video.  Can a phone battery do that?
If it's a lithium it can.
.Unknown. (author)  Re-design6 years ago
I've got another idea: put 2 li ion batteries in series and regulate with a 7805 IC. Any thoughts/comments?
Use a charger made for lithium batteries and it should work.