Wet cell battery trouble
We have three 12V wet cell small car batteries for powering GPS base and external radio, and robotic total stations. When not in use they are left on CTEK smart chargers. The charging station is in the office, which is under aircon about 12 hours each day. I??d been away recently for a few weeks so nobody was checking the chargers and when I got back, all the chargers were showing fault light. One battery had over 12V on it, one was about 11.5V and the other was 4V.
The one that was 4V looked like it had no fluid in it, and the 11.5V was not much better, the 12V one looked ok. I can only presume that the aircon has had its tentacles down the vent holes and evaporated the water, unless some pilgrim stole the juice while I was away. I’ve just refilled them with ??battery water? (not the acid juice), and within an hour the 4V (not connected to a charger) has crept up to 7V and I??ve put the other two on charge to see if they’ll charge up and wont get to the fault light.
Also, the positive terminal on one has corroded right through and collected this gunk. This has happened before. The terminals are home made using those light gauge hobby electrical lugs that you can solder things on to.
One other related concern is that I have a 2005 BMW X5 that has the battery (I??m fairly sure it is wet cell and not AGM) in the rear of the car, inside the cabin, so it is ??touched? by the aircon, and therefore if this aircon-evap-your-battery-water phenomenon is true, the same thing could be happening there.
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