when you recharge a 12 V dry cell battery the power supply's current is about 1.5A? Sound right?

Answer 1

First determine the chemistry of the battery. sounds like you have a gel cell battery at 12V. That is a lead acid and there is probably an Amp Hour rating printed on the side. The rule of thumb used to be 1/10th to 1/20th of the Amp Hour rating.
but I believe that figure is out of date.
Also how long do you which to charge the battery? Is this a continuous trickle charge (lower current) or a full recharge (higher current)?
Look up the manufacturer on the web and find the battery and you can get the correct information.
I have included info on one battery below.

Answer 2

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RE:
when you recharge a 12 V dry cell battery the power supply's current is about 1.5A? Sound right?

Answer 3

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Its not designed just to die after a year. Rechargable batteries have certain chemicals inside that can hold a charge and regain the charge by adding electricity. Over time, these chemicals (usually nickel and cadmium) lose their potency. The best way to extend their life is to periodically run the battery completely dead, and then recharge it fully. Most take several hours to actually recharge, and if you take them off too soon it can reduce their potency. Always leave your batteries to charge for at least a couple hours, don't always trust what the phone says. As far as the on/off question, the batteries will keep the current charge for longer if you turn it off, but it shouldn't affect the lifetime of the battery. Vibrate does use more of the current charge, but ditto on the lifetime. If your battery won't keep a long enough charge, the potency is permanently affected and you do need a new battery. Freezing the battery may work, but it may also cause the battery to explode. Do that at your own risk.

Answer 4

That depends on what kind of chemistry the dry cell has, its size and capacity, and its state of charge when you measured the current. It would also depend on the technology and capacity of the charger.

And I hope the battery is one that is intended for recharging and you are using the right kind of charger. Batteries have been known to explode if overcharged or charged too quickly or if the battery was not built for recharging. And if you mean by "dry cell" a carbon-zinc or alkaline battery, most are not intended to be recharged. Don't even try, especially at the rate implied by the 1.5A reading.

Answer 5

I assume you are talking about a rechargeable cell (not a dry cell which doesn't come in 12V anyway). The current flow is usually a function of how much more charge is needed. In a trickle charge the current is a small number (below 1.5A) that is only enough to balance the losses as the cell self-discharges.

So the answer is a bunch of "no", including no dry, no 12V, and no 1.5A, and especially no to "sounds right.".

Answer 6

Most 12 V batteries are lead-acid. You need to verify this. Standard practice is to charge a battery using a charge current given by

I.Charge = C/10

where C is the amp-hour rating of the battery.

For example, a 50 amp-hour battery would be charged with a 5 amp current.

Answer 7

Without details of the battery, the charge current is meaningless and many chargers are sized by voltage.

A typical charger may be rated at 110% of the battery voltage for say NiCads, although modern chargers do consider currents.

Often it is heat that damages batteries during charge and so it is this that needs to be controllled. Obviously batteries don't have thermometers so the charger has to model the battery for optimum charging.

Answer 8

Dry cell batteries are not rechargeable. If you mean a captive electrolyte battery like a gel-cell, it depends on the power supply. If you actually hooked up a power supply to a dry cell battery, you are not accomplishing anything. You are lucky you used such a small power supply, and so is your eye doctor.

Answer 9

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