I am replacing a battery pack that's past its prime. I know how to cross wire the 1.2 volt batteries to get 6 volts. On any other project I've worked on, say R/C model battery packs, under the plastic wrap is the voltage, amp and or other numberto idenify what type of battery to replace it with.
In that case, it's a simple matter of buying the same type of battery and soldering it together in the proper order. However, these batteries have no writing on them at all. The only way I know the voltage and amps is a label on the plastic covering.
It requires 5 1.2 volt batteries to get to 6 volts, but I'm not sure what amperage each battery should be? How do I figure that?
2007-05-25 06:37:50 · 7 answers · asked by rann_georgia 7 in Science & Mathematics ➔ Engineering
There is 5 cells which I assume are 1.2 volts each cross-wired to get to 6 volts and a small circuit to prevent overheating, I'm guessing.
2007-05-25 07:02:32 · update #1
It is a Nickel Hydryde type battery and the curcuit attached to it may well indeed be a charging curcuit. I want to replace it with like-kind and like-stock. This device does have its own charger.
It's a major rip off from the manufacturer who want me to mail it to them to replace this battery and insure it incase of loss. This is all well and fine, but the device is worth 2,500 bucks and insurance for that is 178 dollars. It looks like I can buy the batteries with tabs for 10 to 25 bucks myself and resolder the wires.
2007-05-25 08:36:23 · update #2
"All single cell batteries will have the same voltage rating. You can even cross types such as carbon cell or alkaline or lead acid."
This is possible but definitely NOT recommended. The cell with the smallest current capacity will run down first, limiting the capacity of the battery as a whole. Furthermore, when this cell runs down completely, the other cells will reverse the polarity of the voltage across it. This often has bad consequences for the life of a rechargeable cell and may in extreme cases result in the discharged cell's exploding. You want all of the cells in your battery to be as similar in technology and capacity as possible.
If the device you are installing the battery pack into does not have a charger, you might want to consider replacing the nickel-cadmium cells with nickel-metal hydride (NiMH) cells. They are readily available these days and chargers for them are also inexpensive. NiMH cells also don't have the environmental problems of Ni-Cd cells - cadmium is toxic - and last longer on a single charge than Ni-Cd cells of the same physical size.
If you go with the NiMH replacements, it might be wise to put a suitable diode in series with your battery pack to block any charging current the device may provide. The charging requirements for NiMH cells are quite different from Ni-Cd cells and NiMH cells don't take kindly to overcharging.
2007-05-25 07:46:59 · answer #1 · answered by devilsadvocate1728 6 · 0⤊ 0⤋
Each battery must be able to deliver 2 amps. Most NiCad batteries will easily generate this much current. Just use a battery the same physical size as the rest of the pack. In an emergency you are safe using larger batteries. All single cell batteries will have the same voltage rating. You can even cross types such as carbon cell or alkaline or lead acid. Each type has a characteristic voltages. Carbon = 1.5 volts: Lead Acid = 2 Volts (but varies +/- .2 volts depending on the available charge) etc.
2007-05-25 07:06:03 · answer #2 · answered by Anonymous · 0⤊ 1⤋
You need to measure the current in the circuit using an ampmeter. You connect it 'into' the circuit to get the reading so you can measure the current flow (as opposed to taking a voltage reading where you take the measurement from any two points where you want to find the voltage difference). This should show you how much power your circuit needs... Hope this helps
2007-05-25 10:56:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
with out understanding what type of battery it really is a ordinary rule for charging is a million/C (ability) for 10 hours for known charging. quick charging if the battery helps it would want to boost the charging present day with the help of about 10. again we would might want to understand more advantageous about this battery to furnish more advantageous concise practise. employing 2A might want to very in all danger reason the battery to fail. it would want to warmth up a lot too immediately. If it really is a present day charger with monitoring circuits and the 2A putting is a optimal you'd be ok. yet when it really is a charger made for lead-acid vehicle batteries it really is a nasty decision.
2016-11-27 02:46:23 · answer #4 · answered by bennison 4 · 0⤊ 0⤋
If the cell voltage is 1.2V, then the batteries are, mosl likely, NiMH (nickel metal hydride) cells. These are rated in mA-h (milliamp hours). You can buy these on eBay. Get the highest mA-h rating you can find for the cell size (AA, C or D).
2007-05-25 06:48:22 · answer #5 · answered by John S 6 · 0⤊ 0⤋
Each battery should be 2000ma. 5 @ 1.2 volts in series will give you 6 volts @ 2 amps.
2007-05-26 00:13:58 · answer #6 · answered by jayktee96 7 · 0⤊ 0⤋
For batteries in series, the voltage adds, current is the same as one battery. For batteries in parallel, the current adds, voltage is the same as one battery.
So as long as one of your 1.2V batteries will supply 2A, your pack as a whole will as well since you have them in series.
2007-05-25 06:51:04 · answer #7 · answered by audiotecnicality 2 · 2⤊ 0⤋