Polaris ATV Legend
Join Date: Feb 2009
Location: Washington State
no, they are not....a battery tender has special circuitry the completely cuts the charging power when it sense the battery is full...and resumes charging back to full after it senses the battery has dropped X amount of voltage, and charges back to full and stops....
a trickle charger doesnt have the ability to stop charging. the reason for a trickle charger is to not really increase the temp of the battery acid and to help protect all the fuses and electronics on board. when you do a quick charge, it becomes really easy to boil the battery acid if you dont pay attention to it. a trickle charger gives you a lot more slack in not overcharging the battery, but if you left a trickle charger hooked up to a battery for months at a time, it can, and probably will still boil the battery acid and cause damage and possible premature failure.
a device labeled battery tender is the only safe device to leave plugged in months at a time