Finally found out what these little jewel were for and trevb nailed it. Seems the fossils of the world (dumb systems) had no way to let you know when battery was getting low other than BDI if equipped. Then one day a brilliant company come up with a lil add on module that would cut hydraulics when battery voltage was getting close to battery rated voltage. Apparently these modules were sold to about every battery supplier known for units that did not have oem pump cut cards already installed. These were probably installed by a lift dealer tech or battery tech. Finding these Exide pump cutters are near impossible. Just today i had to remove 2 of these cards that were mounted on a couple of fossils (Yale model k66c and Hyster e40ac) to regain hydraulics. One had sat 2 years and the other several months before i took a look at them. Shame i couldn't find a exact replacements for these but customer wanted them off period. What the customer wanted, the customer got.