What is the difference between the Panasonic K-KJ17KHCA4A Eneloop Pro vs the Panasonic K-KJ17MCA4BA? Which is a better choice to buy?

The pro cells hold about 25% more capacity under use before you have to charge it. That translates to longer run times for things like hiking GPS and high powered flashlights and wireless microphones in constant use. The trade off is that the pro cells don't retain a charge when stored which is good if you normally plan to drain the battery within a few days of charging it. In a TV or DVD remote control, the pro cells would have to be charged at least once every several months, where the regular cells will last for years without charging in remote controls that are not used daily. So far, I have never had an Eneloop battery ever leak, where I have had several expensive remote controls and headlamp LED's destroyed by leaking modern alkaline batteries. Modern alkaline batteries will often start leaking while still performing and still many years before the best used date has arrived. Modern warrantees for alkaline batteries only cover the battery that fails to perform, not the expensive device that was destroyed by the leaking alkaline battery. I have had several Duracell batteries start leaking while still unused in the original package stored in a cool dry place (basement) and still have a few years before the best used date has arrived. Today's alkaline batteries are junk. The standard Eneloop battery seems to be the most dependable battery I have ever found. They cost more, but the extra cost is worth it. Other brands of NiMH batteries I use often don't hold a charge in storage. The supposed lower voltage compared to alkaline is not the whole truth. Under extreme low power loads, alkaline battery voltage is higher, but under higher loads like cameras and flashlights, the alkaline battery voltage drops lower than NiMH battery within a second of the time the load is applied and then goes back up to resting voltage after the load is turned off. After an alkaline battery looses around 20% of its original charge, it is performing worse than a rechargeable NiMH battery and many devices like cameras can't take that drop in voltage.

i just received the charger and i do not see any indicator lights on mine. anybody???

Just to update this - the chargers shipping now have hidden lights (unlike the product picture). To see them charger must be plugged in with batteries in place. NOTE: To clarify the paper comment - the batteries are shipped in the charger in the charging position. Before first use, remove all four batteries and you will find a small piece of cardboard paper at the top covering the positive charging contacts. This paper is to be discarded. Put the batteries back in position, plug in charger to working circuit and you will then see the now hidden lights under the white plastic "skin" below each battery. This is still true as of 11/2018.

Do the Eneloop batteries require an Eneloop charger or can they be charged in other AA and AAA battery chargers?

The Sanyo/Panasonic eneloop cells can be recharged in any good-quality charger designed for NiMH batteries.For best battery lifespan, choose a 'smart' charger that has a charge time between 2 and 5 hours.Avoid slow, timer-based dumb charger that will over-charge your batteries, and 'ultra-fast' 30-minute chargers that will over-heat your batteries.

Must you charge 4 batteries at a time OR can you charge, say 2 with 2 open slots?

The Panasonic BQ-CC17 can recharge 1, 2, 3 or 4 AA/AAA cells at once. You don't need to charge in pairs like in the case of old MQN06 charger.

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エネループ2100サイクルバッテリーセルエネループ2100サイクルニッケル水素プリチャージ充電式バッテリー、eneloop ni-mh「低自己放電」バッテリーは、パナソニックの高度な充電式バッテリー技術を利用し、最大2100回充電できます。 Eneloopバッテリーセルは一貫した電力性能を提供し、充電の70%を最大5年間維持し、ソーラーパワー(工場)でプリチャージされ、パッケージから出してすぐに使用できます。これらのエネループセルは、保管寿命を延ばし、華氏-15度までの極端な温度性能を備えています。 eneloop ..1931年以来、パナソニックはバッテリー技術の大手メーカーです。 2005年、eneloopは人々の生活、仕事、遊び方を変える新しいタイプの充電式バッテリーとして発売されました。この充電式バッテリーは非常にシンプルなアイデアを念頭に置いて作られました;何度も繰り返し使用できる共通のエネルギー源を提供します。この「ループエネルギー」はエネループになりました。今日、エネループバッテリーセルは、業界最高の充電式バッテリーとして世界中の何百万もの消費者に認められています。主な特徴 eneloop ni-mh 2000mah 典型的 /1900mah 最小 (aa) 800mah 標準 / 750mah 最小 (aaa) 5年間の使用後に充電の最大70%を保持し、太陽エネルギーから生成された電力を使用して工場で2100回まで充電でき、パッケージから出してすぐに使用できます。極端な温度下でも動作します。 ~4°fのバッテリーは、iec 61951-2(7.3.2)に基づく「低自己放電」充電式バッテリーが完全にまたは部分的に消耗した状態で充電できます。 iec 61951-2(7.5.1.3)によって確立されたテスト方法に基づくバッテリー寿命。使用状況により結果が異なる場合があります。 20° (68f) 環境条件(放電:)でグリーンエネルギー認証センターストレージによって認定されています。 2lt、e.Vは1.0v相当)(使用条件により異なります) Eneloopバッテリーは充電するには充電器が必要です。 Panasonic ニッケル水素バッテリー充電器推奨。

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Batteries Included	Yes
Batteries Required	Yes
Brand	Eneloop
Manufacturer	Eneloop
Item Model Number	BK-3MCCA16BA
Model Year	2014
Product Dimensions	3.05 x 19.38 x 10.8 cm; 430.91 g
Item Weight	0.95 Pounds

AA ENELOOP BATT 16 PK

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