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Sanyo Eneloop Compact Charger

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Sanyo Eneloop Compact Charger with 2 Sanyo Eneloop AA Batteries is an extremely compact, small and yet advanced NiMH battery charger pack. This pack is useful for any one who needs a small battery charger. It is particularly useful for people on the move or for people who travel often. You can use eneloop AA batteries for applications like flashlights, digital camera, remotes, gadgets etc. Eneloop Batteries due to its special low self-discharge properties can also be used for applications that don't see frequent / daily use use (this is the area where alkaline batteries used to dominate). Sanyo Eneloop batteries can be recharged up to 1000 times, it serves the purpose of almost 1000 alkaline batteries at a fraction of its cost. Imagine the amount of money in savings that this small pack with 2 Low Self Discharge NiMH can provide, especially during these tough economic times. The cost of the compact charger pack is fully recovered within just a few battery recharges compared with cost of single use Alkaline batteries. Sanyo first introduced Eneloop by in November 2005. Eneloop batteries are one of the most environmentally friendly and long lasting batteries available to consumers. Read in depth review of Sanyo Eneloop Batteries Power Pack with advantages and features of Eneloop technology. You can buy Sanyo Eneloop Compact Charger from Green Online Products at DepotEco.com, they offering a good deal on this pack. Sanyo Eneloop Compact Charger pack includes two Sanyo Eneloop AA cells, Compact Charger and instruction manual. Sanyo Compact Charger has advanced electronics and circuitry for intelligent battery charging. It also has an inbuilt temperature sensor for thermal protection. The Compact Charger is very light weight, plugs directly to wall electric outlet.

Sanyo Eneloop Compact Charger Features:
  • Compact size
  • Intelligent charging, detects charge state of battery, stops charging when battery is fully charged.
  • Wide input voltage range of 100 to 240 V.
  • LED Indicator for charging status display
  • Inbuilt temperature sensor for temperature protection
  • Sleek light weight design easy to fit in travel cases
  • Self Contained unit with power pins that fits directly to wall outlet
In-Depth Review & Pictures:
Sanyo Eneloop Compact Charger Packaging: The Compact Charger is packaged in blister type packaging. On front display, major features & applications. The package with batteries weighs about 150 grams, 72 grams without batteries.

On back side, top left region of Sanyo Eneloop Compact Charger package you will find "eneloop: energy + loop" which clearly explains the eneloop brand. Just below is an illustration that explains how eneloop carries advantages of both NiMH battery as well as alkaline battery. There is also a chart showing typically 514 as the number of pictures that can be captured on single charge of eneloop AA battery using Canon DSC-S4 camera as compared to that of 117 from alkaline under given test conditions. A long term energy storage comparison with conventional NiMH battery clearly shows major advantage that we get using eneloop batteries. At the center major features as well as line drawing of charger is shown. Manufacturing details, website for more information and the bar code for scanning are located at the bottom most portion. It should be noted that the Eneloop batteries for this pack are manufactured in Japan where as the charger is manufactured in China.

Inside Sanyo Eneloop Compact Charger Pack you will find two Sanyo Eneloop AA batteries, Compact Charger and instruction manual. You can also download this instruction manual as a PDF document from sanyo's eneloop website here.

Sanyo NiMH Compact Size Comparison: This is one of the most compact charger with dimensions in mm as 70 (W) x 75 (L) x 27 (D). Without batteries it weighs mere 72 gm. Easy on weight, easy on size makes perfect companion for travelers.

Here is a picture showing the charger sideways compared to eneloop AA battery.

Sanyo NiMH Compact Connections, Interface & Other Details: On front / top side there are two charging bays. The charging bays are designed to accommodate AA as well as AAA battery. On each bay, positive terminal is common for both the batteries where as there are separate negative terminals that help in delivering required charging current depending on battery type. At the bottom there is a red colored LED indicator to indicate charge status of batteries. When the cells are fully charged, LED switches itself OFF. Fast blinking LED means damaged battery.

Have a look at more pictures from both sides.

Let us turn our attention at the back side of charger. The first noticeable thing on right side is integrated power input plug. Also on back side of Sanyo Compact Charger, detailed charger specifications are mentioned along with typical charging currents. The Sanyo NiMH Compact Charger is specified as Model #NC-MDR02NU. Charger accepts input voltage range of 100V to 240 Volts DC at 7 to 11VA. The output charging current for Sanyo Eneloop Compact Charger is 550 mA per channel for AA battery bay where as it is 380 mA per channel for AAA battery bay. There is a precautionary note informing user to read instructions carefully before using the equipment. The charger is designed to charge NiMH type cells only. The charger is manufactured in China by Sanyo Electric Co., Ltd.

Here is the animation of unfolding integrated power plug. The charger will fit directly on wall electrical outlet. No wires to mess around.

Typical charging times for 2000 mAh Sanyo Eneloop Ni-MH AA AA Cells is 240 min where as for 800 mAh Sanyo Eneloop Ni-MH AAA Single AAA Cells is 135 Minutes. The charge time may vary depending upon battery condition and temperature.

Sanyo NiMH Compact Charger Technical Details: Externally it looks like a very simple, small & economical charger! So how does this compact charger actually perform? To know answer to this, let us go in to further details. It's true that the charger looks small and compact, but size alone should not be a determining factor when it comes to performance. In fact, this charger it is loaded with brains and intelligence. The charger constantly monitors battery condition and knows when battery is fully charged. This is achieved by use of special Microcontroller (µC) based electronic charging circuitry. It even has got a temperature sensor on board. The temperature sensor is very useful in protecting the batteries and the charger from meltdown. Skip the rest of this section if this sounds too techy.

Would you like to see what's inside the charger? For your convenience, we opened up the charger to see what's really inside. Pictures that follow are purely for your viewing pleasure and admiration. WARNING: DO NOT TRY THIS AT HOME. Of course, unless you know what you are doing. By opening, you may have to sacrifice and void terms of warranty; additionally, the charger may get damaged if not handled carefully. We have opened up this charger so that you do not feel a need do so. Rest assured that it's no ordinary charger.

The first picture shown here below makes us feel like there are a few components that every normal charger would have. But if you look in to more depth, you will notice that there are a few components that are particularly special. Some of the components such as filter capacitors, LED are easily identifiable. But did you notice the temperature sensor that is standing exactly in center of where both batteries would be placed? The dark green color component with red dot on top, the one that is placed inside white colored circle labeled TH 201 just below the digits '0608'. Yes that's the temperature sensor. At the bottom you might have noticed a bright yellow colored box, it's the inductor and placed very closely to two more very interesting components.

Zooming in towards bottom of PCB. There is one 7 pins dip package chip labeled as FSD210 DVF52. This is basically a Switcher from Fairchild, more technically it's a class of Fairchild Power Switch. This component itself deserves another page for review. But to summarize, FSD210 is integrated Pulse Width Modulator (PWM) and Sense FETs specially designed for high performance off-line Switch Mode Power Supplies (SMPS) with minimal external components. The device is monolithic high voltage power switching regulator that combines an LDMOS Sense FET with a voltage mode PWM control block. The integrated PWM controller features include: a fixed oscillator with frequency modulation for reduced EMI, Under Voltage Lock Out (UVLO) protection, Leading Edge Blanking (LEB), optimized gate turn-on/turnoff driver, thermal shut down protection (TSD), temperature compensated precision current sources for loop compensation and fault protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSD210 reduces the total component count, design size, weight and at the same time increase efficiency, productivity, and system reliability. The device is the base platform for designs of flyback converters.

Looking at just ONE component itself tells that this charger is much more than a simple / elementary charger.

There is another closely associated 4 pin component labeled as PC817 from Sharp that we must discuss here. PC817 is High Density Mounting Type single channel Photocoupler. The photocoupler provides feedback to FDS210. A photocoupler provides signal transmission between circuits of different potentials and impedances. And this is just the first half of the story.

Would you like to know more? Let's flip the PCB. What you see on the back side of PCB is nothing but astonishing and simply marvelous. First things first. You will notice that the HV side of circuit (upper half) is separated with the LV side of circuit (lower half with a LOT of SMD components). Not just that but the charger body has got a physical baffle separator that fits in the PCB notch. This reduces the chances of any electrical shock to exposed charging terminals.

At the lower end, you will notice a big SMD chip. It's labeled as AS-2144D 505 61C2. All we know so far is that it's the main brain that handles all the charger operation. It appears to be a custom designed Microcontroller (µC) chip with custom programming routines. AS-2144D constently monitors battery conditon, temperature and determines when the charge termination takes place.

There is another chip labeled LM358 which belongs to category of Low Power Dual Operational Amplifiers. LM358 series consists of two independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.

We will refrain from going in to details of each of the components but there are other components like voltage references, FET's, zener diodes etc. all working in conjunction to make a extremely sophisticated charger. Overall, the charger appears to be a very well designed.

How to Charge using the Sanyo Ni-MH Compact Charger (Model: NC-MDR02NU)
Note: These instructions are taken straight from the charger manual.

Complete charger manual can be downloaded from www.eneloopusa.com

Test Results: in progress
Reviewed: 2008-09-15
Updated: 2008-12-21

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