I am starting a LIthium titanate (LTO) battery conversion on my 2000 Insight.
I will try and give details and pictures about the whole process.
The conversion will be a 3.3KWH, 72S, ~185 volt 90lbs pack.
UPDATE: Upgraded it to a 3.86KWH 84S, ~210 volt pack by adding 12 extra cells.
I will be using the BCM fooler + BCM interceptor, as they are simple to install and should make the whole conversion integrate nicely.
The battery packs are from a Honda Fit EV, which was produced in the USA from 2013 through 2015 and available by lease only.
Packs come in 24 20AH cells, 1.1KWH (they actually test at 22AH but rated sticker is 20AH)
2.3 volt nominal,
voltage range : 1.5 - 2.7 *most 95% of capacity is between 2.0 - 2.5 volts
Weight of pack: 30.2 LBS
Deminsions: ~10.5" x ~9.5" x ~5.5" *Each 24 pack can be divided easily in half.
Continuous charge: 160 amps
Continuous discharge: 160 amps
Temperature Performance -30C to 55C
Voltage DROP across 3 cells at resting 7.17 volts was .16 volts at 61.8 amps. Compare that to a 2 volt drop on one of my NIMH sticks which was fully charged.
From my testing of the 3 packs 72s, there was only 1 bad cell. The other cells tested fine and moved in perfect balance with each other.
The active BMS located on the packs is not usable and seems it needs to be plugged into a honda fit car so that it can communicate. So far there are really not many options for a BMS.
The reason I decided to use these cells is they are very robust, extremely long life, work in freezing temperature, Very safe from fires. They simply make a perfect NIMH hybrid battery replacement. The drawback is they are heavy, weighing in at almost NIMH weight. A 72S 3.3 KWH pack will weigh 90 LBS.
Thorough testing at 20 amp charge/discharge of all the cells
Each pack has removable black covers that go over the top.
30.2 LBS per pack, which is heavy considering you need 3 of them.
Voltage and capacity out at 20 amps discharge rate, test starts at middle of paper below or 50 MAH.