I just bought this one for my new rebuilt trailer and I only paid $30 from Amazon, plus free shipping and no tax................Boom! love Amazon.
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If the battery is real low, the tender may not charge it... some folks have had some luck putting a good battery in parallel with the low one and hooking the charger/tender to both of them...
Thanks Hawkeye08 . I will try that and see if it works . So far the battery is only reading 1.4volts .