Hi All
Just gone to get my 2002 MX5 1.8 out of my garage. Battery too flat to start it. Hasn't been used for 2 weeks and only had one short run in the 2 weeks before that.
Any advice on whether this is normal?
How long should a battery last?
Is there something I can do apart from disconnect the battery to save battery drain when the car is not in use?
Any other advice?
I will have to look up whether the warranty covers batteries.
Thanks in advance.
Hugh
PLEASE reply to group.
As far as I can tell with my son's '97 Miata, its normal. I'm keeping it for him while he's stationed in Hawaii. The intent was to drive it once a week to keep everything perking. But I had a period where I was out of town for three weeks. The battery was flat after that period, and since then, it tends to go flat after just one week.
This sequence of events also happened last year. The Mazda dealer said the battery was faulty and replaced it. It looks like it's happening again.
Jerry
Generally, batteries should last more than 2 years. 4-5 years is closer to the norm, unless you live in a hot climate, where I would expect at least 3 years. I have had Miata batteries last 4+ years here in SoCal and I have 2 years on my current one. I too was recently out of town. After 17 days away, the 2 year old battery started the car as if I had never been gone. If you are replacing batteries after 2 years, there has got to be either something wrong in the charging system of your car or an unusual current drain - it's not the battery.
Randy
Not normal, but typical of cars with aftermarket alarms. Something was draining the battery: an alarm system, or perhaps a door was left ajar and the interior light was on. Either eliminate the drain, or disconnect the battery while in storage.
Assuming the 2002 still has the Panasonic glass mat battery, they tend to last forever without any maintenance unless maltreated. There is a post here about one 14 years old. However, they should not be charged above 1 or 2 amps, and require some special care charging if really, really flat (see miata.net, garage section).
I would take Lanny's advice on checking what dark current there may be.
Leon
I ran into an interesting problem with a four year old Westco battery. The
99 would crank, but not start well. Turned out that the battery would accept a charge, but would not put out enough voltage under starting current to keep the ECU and the ignition happy. Result? Odd firing timing, misfire, backfires, etc. A bad camshaft sensor can cause similar problems. Even worse, replacement of the cam shaft sensor may seem to cure the problem, until the new sensor is heat cycled a number of times. For whatever reason, the camshaft sensor seems to change sensitivity (or the ECU detection circuitry) under different conditions, such as battery voltage.I d>
Operating under lower voltage, you mean? How?
Leon
I should have one since I replaced mine with a Link. You are welcome to it if you need it. I will not replace it, even if I still could restore the connectors.
Leon
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