Battery Reconditioning

3 Responses to “In what way can you charge a 4v Rechargeable battery fast using a 6v source?”

1. By Zulfi on Jan 20, 2010 | Reply

   i dont think its possible
   but if u got some way try to do it ,if u got its become new invention
   best of luck
   References :
   R

2. By billrussell42 on Jan 20, 2010 | Reply

   Depends on the size (rating) of the battery and the source. You can put a resistor between the two with a value that will drop 2 volts at the highest current you select.

   Watch out, the faster you charge a battery, the easier it is to damage it.

   .
   References :

3. By Kipp on Jan 20, 2010 | Reply

   This depends on the chemistry of the battery. Nickel-based batteries can tolerate a lot of abuse; you could just connect the + to the + and the – to the -… It will likely charge VERY fast. If your 6-volt source is limited (such as a wall transformer), it may take a little longer to try. Heat will damage a nickel-based battery, so if any is detectable, stop the charge! A nickel-based battery is usually fully charged by the time it starts producing heat.

   For a safer, less exciting, but still fast charge, you need to know the capacity of the battery. Assuming your six-volt source can keep up, the resistor formula for the desired resistor is approximately this:
   ohms = (chargeTimeInHours * voltageDrop) / batteryCapacity

   So, if you have a 1Ah battery, a 2-volt voltage drop between source and battery (6 – 4 = 2), and want to charge it in 1 hour: (1 * 2) / 1 = a 1-ohm resistor, assuming the battery is fully dead.

   The above applies to all battery chemistries, BUT, if the battery is a lithium battery, I would strongly recommend against any kind of charging without a proper charging circuit. If the battery becomes overcharged, it will likely violently catch fire.
   References :

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