What do you mean the batteries are no good? I just removed them from the airplane

Emergency Sealed Lead Acid battery which are connected to the DC bus continuously, so that water evaporates from the electrolyte. Droplets of electrolyte plates and separator are beginning to dry out (if necessary) the separation of the material starts to degrade, and thus the shorter the heating cells in extreme cases.
  The Sealed Lead Acid battery are removed from the load constant and have little or no opportunity for the needs firstly, the water level, and second, to test the capacity.
  Checking the water level can not be done in the chamber. You can only take place in a test with a DC charger, and only when the battery reaches full charge. Excessive consumption of water can be a sign of overload (bus voltage too high) rarely or maintenance, or both. The time required for this test may vary from one day to the battery as "good" for a few days "battery problem".
  With backup batteries usually hold a charge, and will be its ability to provide energy slowly as needed (capacity fade), you also need to regularly check the possibility. If this test is not significant or not, the cells have to be deep cycle (download) to recover. Depending on the severity of color, unloading and subsequent reloading done several times before recovery is sufficient capacity. Time for this type of test takes two days for the battery "good" needs a week to the "problem" of the battery.
 There is no battery, the tests do not replace individual cells, specific tests can not be recovered, but not more than 20% of the total number of cells in the battery must be replaced (4-5 cells). If more than 20% of the cells have to be replaced, replace the SLA battery (this is done to minimize the space between the cells of the old and new cells).
  Under normal circumstances, most batteries should last five or six years, if properly maintained (including cell replacement randomly). This is also true for most batteries used to start the engine or APU is true. But with poor service (rarely done) the battery life is much shorter. When the service is rare because the batteries finally removed from the test may be too late.
   Proper maintenance is expensive. It's time to make the right people, the presence of battery shop battery replacement costs, etc. But if, as a result of improper maintenance, the batteries need to be replaced, the cost is much higher than the cost of proper maintenance . This also applies in case of failure, the result of the VRLA battery in a horizontal plane. Finally, the cost of failure in flight battery (heat capacity