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jdemaris
02-08-2005 06:17:40
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Re: Help! Battery condition? driving me crazy! in reply to wilko, 02-07-2005 21:08:19
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That's not necessarily the case. If both batteries were both just charged, and one is bad
and the other good, a machine might start fine if started soon after the charging. In the
case of the 450C, OEM is two 12 volt batteries in parallel. So, one bad battery does not
nullify the good one - however - higher voltage flows to lower voltage - i.e. a good 12.5
volt battery will be drained down to a lower voltage battery - so after sitting for awhile,
the good battery gets run down. If the bad battery has no voltage or continuity between
the POS and NEG posts, it won't drain the other. Deere used to offer the second battery as optional for cold areas, and southern machines
often came with only one. As far as the difference between having two 12 volt batteries in parallel, or two six volt
batteries in series, or one huge 12 volt battery - they all work the same if the wattage
sums are equal. Volts times amperes equals watts. Two sixes in series can be problematic
at times because of higher amperage carried by the battery cables. If done right, though,
it works fine. Also problematic if one battery is bad you get a no-start condition. With
two 12 volt batteries in parallel - Deere uses two separate ground straps so there is less a
load on each cable. But, again, if one battery goes bad, it will eventually drain the good
battery, but . . . a bad battery won't block the flow of the other if it's any good. With a
single large 12 volt battery - it's just two six volt batteries hooked in series, internally - or
call it six two-volt batteries hooked in series. In the old days of car and truck batteries,
each 2 volt cell was removable - so instead of buying a whole new battery, you only
replaced the bad cell.
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