These types of batteries are commonly found in power tools, such as the new Argos simple value drills.
Shakey said in his breakdown of the drills:
"They are LiNiMnCoO2 batteries, the most common type used in powertools. Safer than LiPo, not quite as safe as LiFePo4. However not on the FRA's approved list, I move that this battery chemistry should be tested. It is in the roboteers interests to have such a common battery type available to us."

Does this mean we are currently not allowed to use these batteries? And is there any chance of them being tested and approved any time soon?