So having a bit of a nosy at Li-Ion packs for my 7" to see if it’s worth switching over.
I currently use GNB 6S 102 Wh batteries, they have an energy density of about 5 g / wh. I then looked at the GNB Li-Ion 6S2P 178 Wh packs, and these have a very similar 5 g / wh energy density.
If I look at the bare cells, 40T’s are better at 4.5 g / wh, but that’s obviously excluding all the connectors and wiring and frames for the packs. That’s a significant difference, sure, but other comparisons like to quote nearly double the capacity per weight, which doesn’t seem to hold true for these.
OK the price for the Li-Ion cells is a bit better, but prices have still gone up (nearly £10 for a 40T now!) then I’ve got to solder them into a pack myself (not going to happen), and if I go for something off the shelf, the price difference is even less.
Is there a sweet spot where there is a big difference, and it’s just been eroded by the weight of the cell casings by the time you’re up at these big packs?