Honda Insight Forum banner

Anyone interested in a bunch of Toshiba 2.9Ah SCiB LTO (lithium-titanate) cells?

5460 Views 24 Replies 7 Participants Last post by  eq1
I bought these a few years ago to build a replacement pack, but since then I got into new shenanigans that made my NiMH pack work. I'll probably never get around to building that LTO pack and can't stand seeing these cells go to waste...

I have a box of 74 cells with untapped terminals (first image) and a box of about 65 with tapped terminals. Some of the taps are no good, but there should be at least 60 cells with taps that have enough holding power to grip a busbar. I also have shrink wrap sleeves and a bunch of hardware, washers, screws, etc. And, a bunch of notes and data. I cycled each of the tapped cells and have data for that, for instance. I have initial voltages for each of the un-tapped cells (they were very even)...

I'm 99.5% sure these would work in the car as-is, with the stock BCM's NiMH-based parameters. A 60 cell pack would require you to watch the top-end voltage; a 72 cell pack wouldn't. The nominal voltage range is 2-2.7V; a good working range is about 2.3V to 2.6V; nominal voltage is 2.4V. With 6 cells per Insight voltage tap, you'd be looking at a conservative working range of 6 X 2.3V to 6 X 2.6V, or 13.8V to 15.6V (138-156V for pack). With 7 cells per tap it'd be 16.1-18.2V (161V-182V for pack)...

I think you could easily use 80% of the capacity range without trouble, which at a nominal 2900mAh capacity results in 2320mAh of usable capacity. For comparison, in stock form, with 6500mAh NiMH cells, you generally use about 50% of total capacity, max, so 0.5 X 6500=3250mAh.

The max charge and discharge rating is as I recall about 420W, at 2.6V charge that'd be about 160 amps, or a c-rate of 160A/2.9Ah=55. At 2.1V discharge, it'd be 200 amps, about 69 c-rate... Internal resistance is supposed to be below 1mΩ...

I've mocked-up how they might fit into the stock battery case. There's various ways they'd fit, but in general, you'd have three rows of cells that slide into the existing sections of the case. You wouldn't need to hack-up anything.

Etc etc.

Here's a few images:
Untapped cells

Boxed tapped cells

Close-up of tapped cell
The tapped cells have stainless steel 'helicoil' type inserts twisted into the tapped aluminum terminals.

Charge/discharge curves for tapped cells
See less See more
  • Like
Reactions: 2
21 - 25 of 25 Posts
For EQ1 - still interested in selling these? Happy to pay a fair price.
^ I'm don't know, I'm kind of too busy to deal with it right now... Where would I have to ship to?
^ I'm don't know, I'm kind of too busy to deal with it right now... Where would I have to ship to?
Utah. Can pick up at any freight / warehouse in Salt Lake City
@eq1 you might want to look up the regulations on shipping lithium cells before packing them up. @ryandc It is a beautiful drive from SLC to the PNW. I did it last year to pick up some LTO packs (actually I drove all the way from the east coast.) Might I suggest that you guys set up an InsightFest West to do the swap? (you might get me and others to show up too)
Yeah, not sure what the regs are... I have relatives in Tremonton, maybe I should visit them and set-up an LTO delivery?? I'll have to think about it, and look into what it takes to ship...

edit: looked up usps shipping, looks like that's no good - says you can ship only 8 cells or 2 batteries per mailpiece, with a weight limit of only 5 lbs. That would be a lot of packages...
21 - 25 of 25 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.