Quoted: If you are referring to the Energizer Lithium E2 batteries they are 1.5V instead of 1.2V like AA Alkalines.
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Fully-charged Alkalines are 1.5 volts.
Fully-charged NiCads and NiMH batteries are 1.2 volts.
Fully-charged Lithiums (the non-rechargeable kind) are anywhere from 1.7 to 1.9 volts, depending on brand and batch.
If BOTH batteries are hot, the cause is probably a short circuit inside your remote, since the chances of two batteries going bad simultaneously are very...um, remote. When they are required to produce tremendous amounts of current (such as when connected to a short circuit), they can get pretty hot.