sodium ion battery powered projects - Page 1
Forum section: electronics / projects

author: glenenglish
author_rank: Frequent Contributor
timestamp: August 13, 2025, 11:50:17 pm
content: Has anyone got any physical experience with sodium ion cells 18650-33140 size etc ?I've read all the curves.Next work is to measure variation of internal resistance with SOC.I have orderd a box of them to work with / evaluateIn my case, the Na+ battery ( 10-16 cells in series) is there to hold a product up while someone finds another / changes over the much larger external battery to plug inBeing able to ship them at zero volts is an interesting concept. IE my internal float/charger needs to be able to start gently putting charge into the battery at zero volts...since the internals float on that internal cell bank , it might take some minimum time after plugging in an external power supply before the SOC is up enough to use the system.Or I could have some sort of idea diode / power switch scenario and powers from external while that internal abttery is coming up.interesting times. new battery chemistry with new curves. exciting-glen

author: thm_w
author_rank: Super Contributor
timestamp: August 14, 2025, 12:13:29 am
content: There are a few threads, what specific part did you buy?Maybe good for a garden light where you don't care if it runs down to almost 0V. I'm still waiting for low cost 12V units.https://www.eevblog.com/forum/projects/sodium-ion-battery-evaluation/https://www.eevblog.com/forum/chat/apparently-you-can-just-buy-sodium-18650s-now/https://www.eevblog.com/forum/dodgy-technology/fake-sodium-ion-cells/

author: Mr.B
author_rank: Unknown
timestamp: August 14, 2025, 12:55:44 am
content: I watched this just yesterday.It seems that mass production for vehicles will ramp up late this year.This should hopefully deliver DIY size batteries shortly after.How CATL Made Batteries 90% Cheaper (And What Happens Next)Undecided with Matt Ferrell

author: glenenglish
author_rank: Frequent Contributor
timestamp: August 14, 2025, 07:37:05 am
content: highstar-sodium.comthe 33140 battery is speced for a internal resistance of < 5 mohm, the 18650, < 30 mohmbig difference...

author: tszaboo
author_rank: Super Contributor
timestamp: August 14, 2025, 07:41:14 am
content: Quote from: glenenglish on August 14, 2025, 07:37:05 amThanks. I'm interested in buying Sodum batteries, but so far I've only found resellers, and not manufacturers.

author: glenenglish
author_rank: Frequent Contributor
timestamp: August 14, 2025, 08:08:04 am
content: yeah this is an OEMthey have 18650s and 33140sthe 18650 are a bit small for me, (R internal < 30 mohms ) and the 33140 are a bit physically big (but R internal quite low < 5m ohms)OK so these cells are "do not discharge to zero""Customer shall Prevent draining any product down to over discharge state. A product may be permanently damagedinternally when the cell voltage is lower than 1.8 V and which shall be strictly prohibited, failing whatHIGHSTAR’s warranties under the contract shall cease to apply, thereby releasing the HIGHSTAR fromany liability in connection therewith. After discharge cut-off in accordance with paragraph 3.6,Customerundertakes to educate the users of the products or other parties who may come to handle the products torecharge the cells at minimum time intervals to prevent reaching the over-discharge state"