I get dizzy roaming around from one supplier/manufacturer to another looking for any standards as they apply to differently sized cells.
Where do the 18650, 17670 and (fractional) A sizes come from? EIA now known as ECIA, IP&E, iNEMI? Probably not EIA/ECIA
Great Googly Moogly.
Update: I bought some used OEM battery packs and upon opening one, found the length of the cells to be about 63mm (63.4 x 18mm dia). The skins are marked NT410LAH, but the actual metal shell is marked H410LAH-C under the skin (also 1K05F likely a date/production number). These cells are stated to be 4100mAh NIMH. Coincidently, GC brand has a GC410LAH cell.
Previously posted in Feb, I was inquiring about cell lengths. Excerpt: I received my order of 4/3 A NIMH 4500mAh cells (with tabs) and they measure closer to 66.11mm in length (not 66.25 mentioned previously).
Apparently, it's another issue of non-standardized "standards".
Specs for 18650 flat top cells show 65.5 x 18mm. Most sellers show flat top 4/3A cells as over 65 x 17mm Specs for 17670 flat top cells show 66/67 x 17.5mm
As a point of levity, an Amazon seller shows 4/3A flat top cells to be: Width: 0.66" Height: 2.61" Diameter: 0.69"
I saw a mention of a 7/5A cell size.. really? Can't come up with another letter? So maybe the OEM cells in this instance are 14/12A.
Panasonic OEM/industrial chart shows "18670 (L-Fat-A)" cells.. but no 4/3A size.
Dizzy I tellya.