NiMH Rechargeable Batteries and Battery Charger
NiMH stands for Nickel-Metal Hydride, the materials used in some battery packs. Unlike NiCad batteries, NiMH batteries do not use heavy metals that may have toxic effects.
In addition, they can store up to 50% more power than NiCad batteries and do not suffer from memory effects. I use Rayovac rechargeable NiMH AA batteries for all my outdoor and household devices.
Over the last couple of years, NiMH batteries of higher capacity hit the market, especially in the popular AA size which is what most of the metal detectors use. The first cells were only 800-900mAh capacity but now we have a wide choice of cells ranging from 1500 to 2700mAh.
The higher capacity means the longer run time. I run my detectors on 8 1800mAh NiMH batteries and get at least 36 hours of continuous run time from each machine.
NiMH battery technology is improving at a fairly rapid pace, and it is expected to upgrade and replace the cells every one to three years. The chargers, on the other hand, are a longer-term investment, and charger performance has a significant impact on battery performance. The 8 cell Rayovac battery charger that I use is not a fast charger but it is a convenient charger and it does a great job.
Rayovac 8 Cell Battery Charger that allows charging of AA, AAA, C, and D size batteries
SPECIFICATIONS:
Charge up to 8AA or AAA; 4C or D or 1 9V batteries
Charges Rechargeable NiMH and NiCad batteries
Capable of recharging up to 1000 times
Full charging time - 12 hours
Perfect for high household battery usage
LED lights indicate charging
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