Onyx Boox posted an article that details the design and production of the Onyx Boox Note Air. Two interesting points stand out:(1) Initially, Onyx Boox planned to release the Note Air without a front light. Without the front light, the device would have been lighter and thinner (370g and 4.7mm). In my view, the added front light layer compromises the writing experience - most 10.3 and 13-inches e-readers don't have front lights - so it would have been better if Onyx Boox took the route of reMarkable and worked on optimising the screen for note-taking.
Therefore, some users are concerned that the 3000mAh batteries in the Note Air can only last a few days on one charge.Actually, Note Air can last at least 4 weeks on standby mode.Moreover, the two batteries are parallelly arranged to provide a capacity of 3000mAh in total. Such a structure enables a large space for the batteries and provides them with a higher voltage to speed up the charging. Together with Quick Charge 4.0, you can fully charge Note Air in just a few hours.
From the passage, it is not clear if the battery life will take a hit when using the Note Air for the main tasks it was built for, i.e. writing notes, sketching and reading. Instead, they merely affirm the device conserves battery in standby mode and charges quickly relative to other devices. I appreciate the front light is an essential feature for many users, so a trade-off with added weight and improved writing texture might be worth it. Trading battery capacity for thinness, on the other hand, is a downside that may repel some users.