Can a 9 volt battery charger be used to charge a 9.6 V battery pack?

Simple, quick answer Not satisfactorily The real trick with battery chargers is reliably detecting when the battery is fully charged. That's why there are different chargers for difference battery chemistries and for different voltage battery packs. A charger intended to charge a 9V battery will probably wrongly detect that a 9.6V battery is fully charged well before it has reached capacity and may fail to charge the battery at all Below are ideas from various contributors.

All make valid points but before using any ideas to modify a charger, make sure you understand the risks of explosion and fire by wrongly charging a battery If you mean the chargers for 9V rechargable batteries charging a 9.6V remote control car battery, it will not work. It's easier to just buy the proper charger To charge up a battery, you need to supply current at a voltage higher than the battery's voltage. If you don't have that voltage, then current will not flow For example, most cars have a "12 V" battery that measures around 12.6 V fully charged and open circuit, and requires around 14 V to charge (Like any other battery charger, such a battery charger would need to pump enough current into the battery that it recharges in a reasonable amount of time, but not so much current that it overheats the battery, overcharges the battery, or both.

A resistance in series will help to limit the charging current. ) Think about the old standard water analogy. You have two buckets at different heights and some hose.

If you want to be able to fill one bucket from the other, you need the bucket full of water higher off the ground. That gives it a higher potential (voltage) than the one you're filling. I have a universal charger (available from R/C hobby shops), and it works by adjusting the voltage to give you a particular current.

The target current setting is determined by what the given battery pack can take without heating up and venting (blowing up) Comments specific to NiCad and metal hydride batteries: If you are using rechargeable nimh or nicad 9v batteries, you are in fact NOT using a true 9v battery. ALL nimh & nicad 9v rechargeables are actually either 8.4v or 9.6v. And they are often interchangeable in devices and chargers alike.

The difference in voltage is not sufficient to cause a problem with the charger. The charger will produce close to 17v to charge the cell, which will be high enough to achieve peak voltage for either version of the "9v" (8.4 or 9.6) rechargeable battery Most "smart" chargers use what's known as "negative delta v" cut-off method When nicad or nimh batteries reach a full charge, they begin to heat up, this in turn increases internal resistance which causes a short sharp voltage drop (negative delta v). The "smart" charger senses this voltage drop and either cuts off the charge or switches to a low current trickle to maintain a peak charge This applies to the standard "9v" size format.

If you're talking about using a standard size "9v" charger to charge a 9.6v RC car pack, then the answer is still YES, but a standard "9v" charger has a very very low current output and is only going to be able to provide a trickle charge effect for an RC car 9.6v pack, and it could take a very very very long time to charge a high capacity pack like that using a charger meant for a standard little 9v, meaning 24-48 hours or longer.

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