Rechargeable batteries can be recharged from as many as 600 times to 1,000 times depending on the quality of the rechargeable battery.
For cheaper rechargeable batteries you should get at least 600 recharges out of the rechargeable batteries but for higher end rechargeable batteries that cost more then you can usually get at least 1,000 charges out of the rechargeable batteries.
If you put the batteries in slow charge mode then charge the rechargeable batteries overnight slowly then the batteries will usually take more charges than they would if you fast charge them.
If you get between 600 to 1,000 charges out of the rechargeable batteries then you're doing good and saving money but after 600 to 1,000 charges the batteries might recharge again but they may not.