minimal battery info on the last page, but you may find the other pages interesting! https://www.fleet.ford.com/truckbbas/topics/2016/16_Transit_SB.pdf

 

alternator output curves including the transit (there has been some debate here about what rpm is max amps) https://www.fleet.ford.com/truckbbas/topics/2016/16_Electrical_SB_Updates_v5.pdf

 

no ford info, i am just putting it out there http://batteryuniversity.com/learn/article/sharing_battery_knowledge

 

The MSDS shows what the battery contains lead/lead acid/sulfuric acid - https://www.fcsdchemicalsandlubricants.com/main/msds/Lead Acid Battery SDS.pdf

Rather curiously it is missing from this chart. But based on it we can see this battery is considered 'Tested Tough Max' and is supposedly warranted until 100 month/unlimited mileage warranty w/ 36 month free replacement. This also shows the construction of the Tested Tough Max batteries.

http://machenry.com/documents/batteryspecs.pdf

Edit: You probably already knew the warranty based on here or similar -- http://www.fordparts.com/Commerce/P...jlS55RKEQ==&id=390174181&m=44&search=true&year=2015&make=Ford&model=Transit-250

 

The Group 48 form factor is very limiting, so I would assume that the specs for the Ford battery are very similar to those of any other Group 48 AGM battery. Here is the one I bought for my van (for about 1/2): https://www.amazon.com/gp/product/B008FWCLHU/?tag=vs-auto-convert-amazon-20

 

i'm actually interested in a detailed state-of-charge vs. resting voltage chart or graph. i may try calling motocraft and asking whether that's available.

 

The physical chemistry of lead/acid determines SOC for the battery. AGM will affect float/equalize times because the ion transport mechanism is different than a liquid flooded cell, but that is time only, not state of charge. The curves from any good battery manufacturer will do. The only real difference is how well they control the laboratory conditions while gathering test data. Temperature has a major effect on the voltage and that is the temperature at the point of the chemical reaction. Some labs monitor the case temp, others actually look at the lead plate temp.

The chart below is about as good as anything Ford can provide.

 

thanks! but then i see something like this, which shows the SOC vs. voltage varying across flooded/gel/agm:
http://www.energymatters.com.au/components/battery-voltage-discharge/

 

Forgot to mention that the available charge depends on temperature and how fast you discharge it so a 70AH battery (usually rated for 25 degrees C an 20 hour discharge rate) will be more like 50AH at freezing. Also if you pull more than 3.5A (70AH/20H) you will get less than 70AH of capacity.