I have been using Deltran battery tenders for years and believe they extend the life of a battery. Any thoughts on what difference there is between Deltran and BatteryMINDer? Price wise, I bought my last Deltran on Amazon for $24.99. Today they are on Amazon for $23.99.
I have/had several types of "tenders".
1 - Deltran Battery Tender Jrs
2 - Deltran Battery Tender Plus
1 - Deltran Battery Tender Plus GEL
1 - Black & Decker BM3B
1 - BatteryMINDer(used for a couple of years and given away but still in use)
3 - Npower 2.5w solar maintainers
1 - Npower 7w solar maintainer
The Npower solar maintainers are in use on vehicles or toys that it's not possible to store them in a area with power. They have worked well for the past 3 years with out any issues. The 7w is on my truck in the driveway and sits in the cab in none-direct sunlight, previously unless the radio was unplugged it would drain a battery in about a week and a half. Now it can sit for weeks on end, no disconnecting the radio and no extension cord laying in the driveway.
The Tender Jr is mounted to a outlet above my lift, any bike that is on my lift for any length of time gets hooked up. The Other 3 Deltran tenders and the Black & Decker BM3B are on my bikes during times of un-use and over the winter. All have worked without issue.
The battery in my '76 Shovel is a maintenance free Yuasa from 2002 and as of last summer was still strong. The original battery in my '99 Fatboy lasted up until last year. It was taken out in a voltage regulator/stator failure. Both have always been on a tender when not in use.
The only "tender" I have ever had a issue with was a Harbor Freight that was given to me. Cooked the first and only battery it was ever put on.
Amazon frequently runs battery maintainers on their Lightning Deals. Both my Deltran Jrs were $19 and the Black & Decker was something like $14
