I would suggest and think it would be advisable to go with the Li-ion if you plan on keeping your car. Additionally, a longer range is achievable, but may be more costly than lead acid. For a Li-ion 17kw pack designed for Volt, your are looking at about $4k. For a 24kw pack designed for the Leaf or Focus, you are looking at about $5k. With proper care you wont be replacing any of these in 5 years or less like lead acid. My experience with Chinese phosphate is not good, failures are unpredictable. Maybe that's why most new electric cars don't use the Chinese batteries. LG chemical seems to be the leader in the Li-ion field and provides cells to most EV manufacturers, except Tesla. Do a comparison of the costs and amortize it over the years you plan on driving the car. Having the Li-ion aboard when selling is a big time plus and will achieve a higher selling price. Lots of luck.
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