Quote:
Originally Posted by andrewwynn
How old is the battery? I've replaced a couple batteries lately that started the car right up (until they didn't) and even when they tested fine on a load tester they were below 40% capacity.
If it's old and can't hold a reasonably full charge it's time to replace.
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This is answering the common question of "
How long should my battery Last?"
Answer: It depends....insert lots of anecdotes and classic real world examples. Bottom line: when it is dead/dying/and gives you trouble.
Example 1: My own X5 Sears DieHard AGM. At the 5 yr mark it was discharged due to a power outage so the charger did not reset. Batt Voltage fell to 7V as the battery discharged. Recharged at 3-4 amps for 48 hrs went to 12.5 volts, but as soon as a load was presented it fell off the scale. Dead unit, replaced with another Sears AGM unit. $200/60 months not bad.
In the old days of open cell batteries, you could drain the old acid, wash out the plates, install fresh acid, and recharge, extending the battery until the first real cold snap. Those days are long gone.
OP: when it gives
you enough trouble replace it. Most batteries last 3-7 years depending on charge vs discharge rates. Sits on a battery tender when not in use longer than three days? Last longer.
__________________
2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green