The Battery Tender Junior starts at around $45 US. If it's not made by Deltran it's not a "battery Tender"
These are MAINTAINERS, not chargers. Good for keeping a battery up in starage - useless for charging a dead battery.
The 10 battery unit is up around $750 - called a "battery managemenr system"
Why are they useless for charging a dead battery? They put out about an amp, it take awhile, 10X as long as one that puts out 10 amps, but they will charge a dead battery.
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