I just heard about this post, so did a quick search and currently it looks like Sriko is the only company providing affordable sodium-ion batteries. They appear to be within about half the energy density of lithium-ion batteries. I used AI (first Google then Bing because it has ChatGPT 5) to create tables comparing battery types:
A($/Wh) D(Wh/kg) D(Wh/L) P($) E(Wh) M(kg) Vol(L) V(V) C S URL(Sodium-ion)
0.46 97.50 235.79 1.81 3.9 0.04 0.017 3.0 3000 18650 https://srikobatteries.com/product/sodium-ion-18650-3-0v-1-3ah-3-90wh-20c-rechargeable-battery/
0.34 114.29 258.31 3.23 9.6 0.084 0.037 3.0 3000 26700 https://srikobatteries.com/product/sodium-ion-26700-3-0v-3-2ah-9-60wh-3c-rechargeable-battery/
0.32 134.78 258.89 9.98 31.0 0.23 0.120 3.1 5000 33140 https://srikobatteries.com/product/sodium-ion-battery-33140-3-1v-10ah-31wh-12c-cylindrical-battery/
0.40 112.50 224.09 21.85 54.0 0.48 0.241 3.0 5000 46145 https://srikobatteries.com/product/sodium-ion-46145-3-0v-18ah-54wh-10c-rechargeable-battery/
0.20 122.22 231.09 43.70 220.0 1.8 0.952 3.2 5000 pack https://srikobatteries.com/product/sodium-ion-na-5c-70ah-220wh-battery/
C($/Wh) D(Wh/kg) D(Wh/L) P($) E(Wh) M(kg) Vol(L) V(V) C S URL(Lithium-ion)
0.23 252.00 761.77 2.85 12.6 0.05 0.017 3.6 300 18650 https://www.18650batterystore.com/products/samsung-35e
0.16 262.01 742.41 2.85 18.0 0.069 0.024 3.6 300 21700 https://www.18650batterystore.com/products/samsung-50e
O: outlay
D: density
P: price
E: energy
M: mass
Vol: volume
V: voltage
C: cycles
S: size
Note: 26700 is not the same as 27100, they are just what each site specializes in.
Comment: I think that it should have been 18065 instead of 18650 because then the last 3 digits could be length in mm, same for the others, but what do I know.
Edit: I forgot to add cycles. When considered, they drop the price of sodium-ion to roughly 5-10 times less than lithium-ion for the batteries shown here.
It bugged me that lithium-ion battery listings only state 300-500 charge cycles, so I did a deeper dive with AI and found these batteries for a better comparison:
O($/Wh) D(Wh/kg) D(Wh/L) P($) E(Wh) M(kg) Vol(L) V(V) C S URL(Lithium-ion)
0.31 236.17 671.08 3.4 11.1 0.047 0.017 3.7 1000 18650 https://www.alibaba.com/product-detail/Wholesale-18650-Lithium-Battery-INR18650-3_1601503766893.html
0.36 222.00 671.08 3.99 11.1 0.05 0.017 3.7 800 18650 https://www.alibaba.com/product-detail/Hot-Selling-Factory-Price-INR18650-30Q_1601159662361.html
0.83 160.00 290.20 4 4.8 0.03 0.017 3.2 2000 18650 https://www.batteryspace.com/LiFePO4-18650-Rechargeable-Cell-3.2V-1500-mAh-4.8Wh-7.5A-Rate.aspx
0.36 227.85 1088.24 6.4 18 0.079 0.017 3.2 3000 18650 https://www.goldencellpower.com/product-item/18650-1100mah-3-2v-lifepo4-cells/
0.36 222.78 1064.06 6.4 17.6 0.079 0.017 3.2 3000 18650 https://www.batteryspace.com/LiFePO4-18650-Rechargeable-Cell-3.2V-2000-mAh-6.4Wh-6A-Rate.aspx
0.80 134.74 365.71 10.18 12.8 0.095 0.035 3.2 4000 26650 https://www.batteryspace.com/LiFePO4-26650-Rechargeable-Cell-3.2V-4000-mAh-12.8Wh-12A-Rate.aspx
0.24 184.00 396.07 3.5 14.72 0.08 0.037 3.2 3000 26700 https://www.alibaba.com/product-detail/lithium-ion-battery-cell-26700-3_1601277009356.html
0.31 240.00 413.29 4.8 15.36 0.064 0.037 3.2 4000 26700 https://www.sunpowernewenergy.com/product/26700-high-rate-lifepo4-battery-45e/
0.31 160.00 128.28 4.8 15.36 0.096 0.120 3.2 4000 33140 https://www.alibaba.com/product-detail/High-Quality-LMFP-5AH-Cell-Lithium_1601161018743.html
0.28 256.41 167.03 5.6 20 0.078 0.120 3.2 5000 33140 https://www.evlithium.com/LiFePO4-Battery/33140-20ah-lifepo4-battery-cell.html
Edit: dangit, I made a mistake in my previous post. A($/Wh) and C($/Wh) were supposed to be O($/Wh) for outlay. I fixed this one to provide context.
