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Discussion Starter #1 (Edited)
I own several trickle chargers that work differently so I did some research. I found it's possible for a "trickle charger" to damage your battery. Here are my conclusions:

Battery Tender Junior
- Charges at about 14.4 volts then shuts itself off until battery voltage drops
- Conclusion: safe

Cheap Amazon trickle charger (MOTOPOWER MP00205A 12V 800mA Fully Automatic Battery Charger/Maintainer) $13.50
- Charges at about 14.2 volts then backs down to 13.2 volts
- Conclusion: safe and maintains battery at full charge without inflicting damage at least
according to this article - Trickle Chargers, Float
Chargers, Self Discharge Rates and How it Works Together

NOCO Genius G750 6V/12V 750mA Advanced Battery Trickle Charger Maintainer $29.95
- Charges at a continuous 14.4 volts contrary to the manufacturers claims
- Conclusion: Charge rate too close to the overcharging threshold; unsafe to leave on charger for long periods

MICTUNING Car Motor Battery Automatic Float Charger Trickle Maintainer 6V 12V (the one with a pinstripe style blue border; haven't tried newer 6/12V model)
- At powerup you can observe different voltage levels cycling up and down. If a battery is
fully charge it will turn itself off. It charges different batteries at different levels.
- This is my favorite charger (over the Battery Tender) because it 1) turns itself off and 2)
charges at a level suitable to the particular battery it's connected to.
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