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If its a NiMH battery then yes. The Energizer charger will charge ANY brand of NiMH rechargeable batteries.
Some will, but it is not recommended because it can damage the batteries or the charger. Invest in a NiCd charger or better yet get some NiMh batteries. NiMh batteries are better than NiCd in every way.
NiMH batteries will need an NiMh battery charger,no other type will work.
A NiCad charger has different sensor values than NiMh. I would find a charger that has a switch to select either, or specifically a Nickel Metal Hydride battery charger to prevent damaging and shortening the life of your batteries.
Packs,yep..
It is always better to use a charger designed to charge a particular battery type. Using a NiCad charger for NiMh batteries or vice versa can cause damage to the charger or batteries, especially if the charger is designed to charge the batteries in under two hours. The worst case is a fire risk. Some charger and battery combinations will work perfectly well together but it is safe to assume that the charger will only be suitable for the battery types stated on it.
The AX-Synth does not recharge the batteries. You have to get an external AA Ni-MH charger.
NiMH batteries are the longest lasting.You need to get a quick charger if you want to charge them quickly.That's more important than the batteries.
you can change the nicad batteries for nimh without any problems, the charging will take longer as the capacity of the nimh batteries will be much higher than the nicad batteries.
???????????????????? What exactly is your question? If you are asking if Ni-Cd batteries are rechargeable, then the answer is yes, although you need be sure to have the appropriate charger for them, just as with NiMH batteries.
No set answer to that. It depends on charger output and battery capacity. Usually a few hours.
Provided the batteries are the correct voltage (You shouldn't have to worry about this, as an odd size battery won't fit, though it is worth mentioning) and chemistry it should be OK. A NiMH charger should be OK on all NiMH batteries, but not for Li-Ion or other types.