Suzuki GSX650F Forum - www.GSX650F.biz

Any time a battery goes completely "flat", some degree of damage is done. Unless exactly matched, one or more cells are likely "reverse charged" in order to make the average charge of the battery zero (or nearly). When recharged, there is no way to attain the previous charge balance between the cells, and some cells are not completely charged, lowering the overall capacity of the battery. Repeated drainings to a flat state only compound the problem and make it that much easier to happen next time- sort of a death spiral. For this reason, keeping an electronically monitored tender (as opposed to a simple trickle charger) on your battery at all times is the best insurance against problems.

Any voltage below 12.4V the damage from Sulfation starts... http://en.wikipedia.org/wiki/Sulfation

http://www.batterystuff.com/tutorial_battery.html


Guess how many bikes I own?

The name Battery Tender is the brand name for one model that constantly measures the battery's charge and will only come on when needed. Basic trickle chargers are always on and if left attached continously they can do serious damage to a battery. There are other automatic chargers available that will do the same thing as a Tender, but I have had good luck with the Battery Tender brand except for one that malfunctioned and failed to cut off. It cooked a PWC battery. The charger was replaced under warranty, but I had to purchase a new battery.

same here, 3 bikes all with Tenders .... 24 / 7 / 365 days a year