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Old 11-06-2012, 05:10 PM   #8
StuartV's Avatar
Joined: Oct 2004
Location: Bristow, VA
Oddometer: 1,473
Having CANBUS compatibility may be of no special value, however, from my reading, having a charger that is Gel battery compatible can be very worthwhile.

My understanding is this: A gel battery can be messed up by feeding it too high a voltage when recharging it. And its max safe voltage is lower than for a LA (lead acid) battery. Generally, any Battery Tender or other motorcycle-specific charger will work fine. But, if the battery is especially dead, then some chargers will supply more voltage than is good for a gel battery.

For example, a Battery Tender Junior has a max charging current of 0.75amps. That is okay for a gel battery.

A Battery Tender Plus will supply 1.25amps. If the battery is dead enough to cause the Tender to run at max output, it can damage a gel battery.

With the Optimate 4 Dual Program, if you put it in "BMW mode", it will disable the Turbo (22V) desulfation mode and only use the Pulse mode.

Personally, I've been a Battery Tender and then Battery Tender Plus user for many years. But, of the 4 I own, I think 3 of them have simply died. I just bought 2 of the Optimate 4 DPs and am using one on my GS and one on my Suzuki. I've only been using them for about a week so far, so I can't really say anything more about them other than that they seem to work just fine, and all the lights on them give me a lot more info about what's going on than the 2 LEDs on the BT Plus.
FS: 2009 BMW R1200GS, '05 GSX-R1000
Iron Butt # 4999, (former) WERA/CCS EX # 666, AMA Life Member, Drummer, Bassist
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