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General Category => General Discussion => Topic started by: sethkeefer on July 20, 2016, 08:54:14 AM
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Replaced my AGM batt with one o them new fangled Li Fe batteries, capacity is only 4Ah instead of the stock 12Ah. I was curious how long it would take to ruin my $100 battery through parasitic draw in the baby Brava.
Key off parasitic draw = 4mA. A 75% discharge is safe in these batteries, that gives 750 hours or 31 days for a 4Ah battery (1,000 hours/41 days to full discharge and toasted battery.)
FWIW
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You are living dangerously. That's a 4-cell you're running by the sounds. 4ah won't last you long if taxed. Don't ask how I know.
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Yeah in hindsight I should have just removed the battery box and put in a 8Ah...
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Don't forget that's 4AH fully charged, what if it's only half charged to begin with.
Then it will only last two weeks
I'm curious to see how it goes, please keep us posted.
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I quickly found about the high parasitic draw in the B750. I slap it on the smart charger every three weeks. Although it has a tender function I don't use it. I use the discharge/then charge sequence as I think the batteries last longer. I am st only on my second battery after 12 years. Forgotten what size the battery I think it is a 14.
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Where are the electrons going? That is, what's causing the draw? My wife's bike is heck on batteries if I don't keep it on a charger (she doesn't drive it a whole lot).
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Direct connected regulator
GPS adapter
USB adapter
ECU
If it's going to be parked for a long time either disconnect the battery Negative or top it up every couple of months.
To measure the draw take the negative off and place a 12 Volt LED in series, if it lights you have a draw.
Measure it VERY carefully with a multimeter on first Amps range then milliamps, If you turn on even the smallest load poof goes the fuse in the meter and it reads zero which is not correct.
The meter in series with a 100 Ohm resistor will be safe, limited to 120 milliamps.
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To the best of my knowledge and experience, the draw on 750 Brevas is in the dash, it does have a clock and other memory items. I have disconnected the dash on mine and the draw goes away.
Brian
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Direct connected regulator
GPS adapter
USB adapter
ECU
If it's going to be parked for a long time either disconnect the battery Negative or top it up every couple of months.
I can assure you Roy two months on the 750 is waaaay too much, even with a reasonably sized battery. Known problem with the Baby B.