Battery tech and range

[oil pan 4]

There's always LiFePO4 batteries.
Saftey is great, but the density is meh and cold performance sucks.
Would be fine for plug in hybrid.

Due to scale of manufacturing battery vehicles make up the vast bulk of the battery industry, so all hybrid and plug ins will follow.
It doesn't really make sense for them to have their own battery chemistry.
For example Hyundai uses Li-poly in all their regular hybrids, plug ins and full electric.

[redpoint5]

It might make sense to run NiMH for hybrids and maybe even plug-in hybrids. You don't need active heating/cooling systems for that chemistry, but the trade-off is energy density. Not sure what the cost per kWh is.

[oil pan 4]

NiMH uses a lot of nickel.
Toyota switched from NiMH to lithium because every time gas prices would spike, prius sales would surge and vehicle production would shut down because of battery shortages.