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Originally Posted by alanmcorcoran
The Battery Tender people will tell you not to use it if your battery is more than a few volts down.
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And that is because.....a wet cell battery that "is more than a few volts down" is not only discharged but DEAD......more than likely, beyond recovery.
A battery tender ABSOLUTELY IS a battery charger.....just a very low capacity one with an automitic "float" feature.
If your battery is just barely down enough that it won't fire the bike up.......which is most often the case when you first notice a problem, a tender is just as good as any other charger for bringing it back up to a full charge. It might take a bit longer but it works just fine.
A battery that a tender WON'T recharge (if you have enough patience) likely doesn't have much life left in it anyway. There are exceptions to every rule, however, and having BOTH around when you really do have "riding seasons" is really the best plan.
A tender won't help you much if you are late for work already and just discovered that you left the parking light on all night (car or bike).