Found on Hackernews, I thought it was pretty good:
Dear battery technology claimant,
Thank you for your submission of proposed new revolutionary battery technology. Your new technology claims to be superior to existing lithium-ion technology and is just around the corner from taking over the world. Unfortunately your technology will likely fail, because:
☐ it is impractical to manufacture at scale.
☐ it will be too expensive for users.
☐ it suffers from too few recharge cycles.
☐ it is incapable of delivering current at sufficient levels.
☐ it lacks thermal stability at low or high temperatures.
☐ it lacks the energy density to make it sufficiently portable.
☐ it has too short of a lifetime.
☐ its charge rate is too slow.
☐ its materials are too toxic.
☐ it is too likely to catch fire or explode.
☐ it is too minimal of a step forward for anybody to care.
☐ this was already done 20 years ago and didn't work then.
☐ by this time it ships li-ion advances will match it.
☐ your claims are lies.
If you're building a vehicle, especially an overlander, you should use boring technology.