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Key Features

The MH-21 can be used to recharge and calibrate EN-EL4/EN-EL4a batteries.
It can fully recharge an exhausted EN-EL4/EN-EL4a battery in about 100 minutes.
Quick Charger battery charger, for recharging and calibrating EN-EL4/EN-EL4a batteries.


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Does the MH-21 with USA 120v cord needs new 240v cord for Europe?

Jan 29, 2012 by
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From what I have read on the MH-21 and this website, the charger will have no problems switching between the USA and Europe power systems. However, it appears that I will need a new cord rated for the 240v while in Europe, right?
2 years, 4 months ago by
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Answer: 
Nikon Digital SLR cameras have an auto switching (from 100v to 240V 50hz/60hz) battery charger that will work in most countries around the world. A/C adapters have similar characteristics. Always check the specification plate on your other battery chargers or A/C adapters as third party products may not support dual voltage systems. We do not suggest the use of third party battery chargers and A/C adapters with Nikon equipment.
Note that the cord included with the Nikon charger or A/C adapter is designed for 110 volt use only. A power cord suitable for the local power system should be obtained on arrival, most airport shops and computer suppliers will carry these items which are typically used for laptop conmputer power supply connections. Be sure that the new cord you buy fits the Nikon adapter you wish to use it with and that it is rated for the voltage in your new location. While not recommended, a simple plug adapter may be used, but caution should be taken as the cord Nikon supplies is not rated for the higher voltage and may heat or fail.
Jan 31, 2012 by
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charging condition

Mar 8, 2012 by
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Is it normal for this kind of charger, mh-21 charger, to blink (all bulb) while charging?
When I insert the battery the 50% bulb blink and in about 20 or 30 minutes all bulb blink at the same time.
Please help.
2 years, 3 months ago by
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Age: 45-54
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Nikon Family: 0-1 years
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Answer: 
If the battery is less than 50% of maximum capacity (50% blinks). 50-80% of maximum capacity (50% glows, 80% blinks). More than 80% but less than 100% of maximum capacity (50% glows, 80% glows, 100% blinks). 100% of maximum capacity (50% glows, 80% glows, 100% glows).
Mar 13, 2012 by
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MH-21 Quick Charger
 
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how to cal battery

May 14, 2012 by
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2 years ago
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Answer: 
With the battery in the charger just press the calibration button.
May 15, 2012 by
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KeithD
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Chargin

Sep 28, 2012 by
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TGP
Boston, MA, USA
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I have a brand new MH-21 plugged in and charging with a brand new EL4EN-ELa battery. The calibration light is on and the battery ( after 3 hours now) the other charge lights aren't coming on. Only the constant green glow at 50%. It appears to be stuck on solid yellow (calibration) and solid green ( 50%) and isn't changing. Any tips?
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1 year, 8 months ago
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TGP
Boston, MA, USA
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Boston, MA, USA
Age: 45-54
Favorite Subject: Sports
Nikon Family: 2-5 years
Experience: Less than a month
Role: Occasional user, memory keeper
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Answer: 
Sometimes calibration can take a long time depending on how much charge is left in the battery as it has to discharge the battery first.
Sep 29, 2012 by
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