My lead acid M.bike battery has had its AH rating rubbed off, can I/how Can I Wotk it out? with a multimeter?
i want to use it for my hobby (model boating) but i dont want to destroy my new expensive speed controller so I need to work out its AH rating but how do i do it?
2007-04-16 09:45:50 · 8 answers · asked by Daedalus 4 in Cars & Transportation ➔ Maintenance & Repairs
to find the rated capacity of a battery you need to know the internal resistance of the battery which cannot be measured with your meter. i:e 0.1 ohms 12 volt = 120 amps also the rating is the max power that can be supplied no device can draw more power than it needs from a larger same voltage battery. lucas or similar can supply duplicate batterys from dimensions or reference charts.
2007-04-16 16:41:02 · answer #1 · answered by Mick W 7 · 0⤊ 0⤋
Just go find another batter about the same size and find out what it's rating is. Otherwise, you'd just have to put a known draw on the battery and time how long it takes to die. Old lead acid batteries are usually not in very good shape, and are non sealed liquid, so you might want to spring for a nice new sealed UPS battery instead.
2007-04-16 10:58:45 · answer #2 · answered by Nomadd 7 · 0⤊ 0⤋
Has the battery still got its part number visible?
It could be something like GT12B-4 and would be broken down as follows GT - Type Size, 12B - 12volt bolted terminal, -4 - current capacity in amp/hours.
But don't forget the capacity will reduce slightly with age.
As for your speed controller, this works on Voltage, the battery capacity merely refers to the amount of time you need to charge the battery i.e 4amps for one hour, or 1amp for four hours in the above case ( the longer the charge time the better in most instances)., and the amount of time the battery will last on discharge.
2007-04-16 23:20:22 · answer #3 · answered by rookethorne 6 · 0⤊ 0⤋
In any DC circuit you have a source + a load + connecting wires. So what you really need to know if you are using the correct voltage source (battery) and how many amps your system needs to run. Once you have this you can put a fuse in the circuit to limit the amps to what the system needs. For example: if you system draws 0.5 amps then you would put in a fuse that would fail at 0.6 amps to prevent any damage to your controller.
2007-04-16 10:04:03 · answer #4 · answered by gary o 7 · 0⤊ 0⤋
Do you now the voltage? Let's say it's 12v. Then discharge it to say 10 volts and recharge at 1 amp. The time to 13.5 volts is the capacity in AH.
2007-04-16 20:38:07 · answer #5 · answered by The original Peter G 7 · 0⤊ 0⤋
1
2017-03-05 02:20:47 · answer #6 · answered by ? 3 · 0⤊ 0⤋
Maybe not yours but I do have this one(female) contact in Ohio that I`d like to play like a fine musical instrument.
2016-04-01 04:42:23 · answer #7 · answered by Anonymous · 0⤊ 0⤋
call the manufacture
2007-04-16 10:03:08 · answer #8 · answered by skcs11 7 · 0⤊ 0⤋