Anybody notice the OP seems to be gone?
: >> Don't put them on a concrete floor either. : >
: >
: > That rule no longer applies. : : true, the material from which cases for batteries have been made has : been for quite a few years immune to the old problems of increased : self-discharge if you put the battery on a concrete floor; or a copper : floor for that matter. : >
: >
Yes
1) Not as safe as having one good one in the car.2) Whatever is draining the charge is causing heat and corrosion at the cause of the draining. That is unsafe.
3) The starter motor is designed to run for only short periods of time before they overheat. (The inefficiencies in the motor create heat.) Even one battery has enough power to burn out a starter motor several times over. The glowing internal parts of the starter motor are unsafe around any gasoline.
If you inadvertantly hook any one of the three up wrong, there is a chance they will explode - either from heat boiling the fluid or from hydrogen gas, and then spray hot sulfuric acid on everything in the area. As far as damage to the person connecting them - as long as you have a rubber apron and an acid-resistant suit and hood/face shield , and do it outdoors or in a well-ventilated area, and be careful to hook it up only when alert and sober, it won't be too bad.
However, instead of stacking batteries -
I might suggest that you get one of those dual batteries, the kind that has a switch to throw in case the "usual" part of the dual battery goes dead (if they still make them.) With one of those, you only have to "switch over" on the battery itself to start the car.
Or just get rid of the battery drain.
You mean *almost* gone! :-) But I'm still here. Been very busy for a few days.
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