Best Rechargeable Battery Chargers: Fast Speed and Intelligence

As you might know, nickel cadmium batteries (NiCd) need to be discharged completely before recharging as the frequent partial discharging leads to the “memory effect” which makes full charge no longer available. NiMH batteries are basically considered to be more tolerant to this issue, however, it's better to provide their complete discharge as well, since such approach ensures longer service life. For this purpose, the EBL Universal Battery Charger has the discharge function. To activate this mode, just press a special button. Another very useful feature is that the model comes with a large and clear display allowing you to get all data about the recharging process.

To get the most out of your NiMH rechargeable battery cells, you need to completely discharge and recharge them again 4–6 times. These simple actions will allow you to maximize batteries' performance. The number of discharge/charge cycles varies depending on the manufacturing process.

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The model comes with a user-friendly LCD display that provides all important data about the charging process in each of the four slots: charging status, time, voltage and current readings. This smart charger automatically detects a battery type and adjusts the output current and voltage to ensure "gentle" and safe charging. Two buttons on the side allow selecting certain battery types and specific charging parameters. A car adapter is a convenient addition to the appliance — you'll be able to charge your rechargeable batteries right on the go.

Li-Ion batteries don't have a memory effect, therefore, these batteries can be recharged at any time, you don't need to wait until they are completely discharged. Many manufacturers evaluate the battery life based on the counting of complete discharge cycles. High-quality lithium-ion cells typically deliver 400–600 cycles. To prolong lithium-based batteries, you need to recharge them as often as possible, a partial discharge reduces stress and prolongs the battery life. Optimally, once the power level reaches to 10–20 percent, the Li-Ion battery should be recharged. It can prolong the battery life to 1000–1100 cycles.

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Audio and visual alerts significantly contribute to the battery charger convenience of use. Three LEDs on the front panel inform the owner of the current battery charge level. The red light indicates that the charging has started, the yellow light shows that recharging is 50% complete. Upon completion of the charging process, the green LED will light up and you will hear a beep.

Thanks to the relatively high output current, it takes about three hours to charge the standard rechargeable batteries completely. With high-capacity batteries (about 2000 - 2400 mAh), the charger will need 4-5 hours to accomplish the recharging process. The appliance features built-in protection against overcharging, it cuts off current when batteries are completely charged. Additionally, in the case of bad battery detection, the device produces a repetitive audible beep.

Nickel metal hydride (NiMH) batteries are typically more sensitive to charging conditions than their nickel-cadmium (NiCd) alternatives. Therefore, to prevent them from losing their ability to hold a charge, don't expose them to heat.

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This rechargeable battery charger is intended for powering up AA and AAA batteries of various capacities. Note that it provides an output current of 360mA, therefore, it will take quite some time to charge high-capacity batteries. For AA batteries, estimated periods of charging is as follows:

• 2300 mAh - 8 hours
• 2050 mAh - 7 hours
• 1800 mAh - 6 hours.

At the same time, charging an AAA battery with a capacity of 750 mAh will take about 5.5 hours. The manufacturer declares that the supplied batteries require about six hours to be charged completely. It's necessary to add that the charger is intended for charging batteries in pairs, not individually.

It's also worth mentioning that the Duracell Rechargeable Battery Charger has a trickle charge mode to maintain a fully charged state of the battery by charging it under no-load. By this, the charging unit prevents batteries from being overcharged. An essential feature!

Discharging a NiMH battery completely is not recommended. In fact, the voltage falling below 0.9V can result in a shorter battery's lifespan. If your charger can't detect a deeply discharged battery, you'll benefit from using a less intelligent charger with an output current of 100-150mA and charge the died battery for a short duration until it reaches a 0.9V voltage.

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As we've mentioned above, this battery recharger can be used with batteries of various capacities. To charge AAA batteries, it takes 3–3.5 hours for 1800–2000 mAh, 3.5–4 hours for 2100–2300 mAh, 4–4.5 hours for 2300–2500 mAh. To charge AAA alternatives, the charger requires 2–2.5 hours for 700-800 mAh, 3–3.5 hours for 900-1200 mAh. As you can see, the charging unit really does well! You won't wait too long for your batteries to be completely charged. Another distinctive feature is a USB port that allows charging mobile devices as well. It's particularly useful when no sufficient number of power outlets are available.

Taking into account the capability of the device to charge smartphones and tablets, we feel it necessary to remind you about safety precautions. Make sure not to overheat the batteries. High temperature is the worst enemy of lithium-ion batteries, so, never expose the smartphone to direct sunlight. Likewise, don’t leave your gadgets near heating appliances. The maximum permissible ambient temperatures should be within the range of 40°F to 122°F.

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