trickle charger is a couple of amps charge that stays on 24/7 If left unattended for too long, it can overcharge or even boil dry the battery
a battery tender with float mode, is the best way to maintain your battery. A 200 to 300 milliamp float charge prevents sulfation by keeping it charged, and it switches to normal charging mode and turns on and off automatically
Do NOT get a trickle charger
Only use a battery tender