Picture shows aaa too short for charger to reach contact points. Does it work?

Be sure to read the enclosed instructions for the charger regarding proper insertion of both size batteries. As already noted, different contact points and different insertion techniques. If you are forcing AAA's in place (and ruining the charger contacts) or they fall out you are doing something wrong.

Waterpik toothbrush has battery 3.7V, can I replaced with these battery?

No, this is a different type of battery, different voltage. It would not work.

How long it takes to charge 2 aa with an advanced charger?

TL;DR: 2.5-3 hours I'm not entirely sure what an "advanced charger" is but my charger outputs 3V@1550mA to two AA batteries. At this rate the batteries should take roughly 2.5 to 3 hours to charge. Your charger is likely not very different so I would expect the same. I'd recommend having enough so that you always have batteries to swap with because that is extremely convenient.

What about use in Europe, will an adapter work? Can it withstand the higher voltage used there? Thanks!

The answer by jennicalaura is incorrect. The charger is 100V-240V Auto Voltage. It's printed right on the package (see left side of the picture). So yes, it will work in Europe with the appropriate adapter and without using a transformer.

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Panasonic K-KJ17M3A4BA Advanced Individual Cell Battery Charger Pack with 4 AAA eneloop 2100 Cycle Rechargeable Batteries

Product ID: 306131475

Details

Brand
Eneloop
Colour
gray
Item weight
159 g
Product dimensions
3.2D x 6.7W x
Specification met
Energy Star

⚡850mAh high capacity

🔆solar pre-charged & long hold

🔋2100 recharge cycles

Description

🔋 Power your life smarter, longer, greener.

ECO FRIENDLY READY - Pre-charged using solar power and holds 70% charge after 10 years—always ready when you are.
UNMATCHED LONGEVITY - Recharge up to 2100 times—save money and reduce waste like a pro.
CLEAR STATUS AT A GLANCE - Four LED indicators keep you informed on each battery’s charge status—no guesswork.
POWER PACKED PERFORMANCE - 850mAh typical capacity delivers reliable, consistent energy for your devices.
SMART INDIVIDUAL CHARGING - Advanced tech charges each battery separately for optimal performance and lifespan.

The Panasonic K-KJ17M3A4BA pack includes a CC17 charger and four AAA eneloop NiMH rechargeable batteries with up to 2100 recharge cycles and 850mAh capacity. Pre-charged via solar energy, these batteries maintain 70% charge after 10 years unused. The charger features individual cell analysis and LED indicators for precise, efficient charging.

Specifications

ASIN	B010U57MSW
Best Sellers Rank	#9,335 in Electronics ( See Top 100 in Electronics ) #780 in Household Battery Chargers
Brand	Eneloop
Built-In Media	4 AA eneloop rechargeable batteries, CC17 rechargeable battery charger
Color	gray
Compatible Devices	Solar
Customer Reviews	4.6 4.6 out of 5 stars (2,223)
Global Trade Identification Number	00073096902404
Input Voltage	120 Volts
Item Dimensions D x W x H	3.2D x 6.7W x 10.9H centimeters
Item Weight	159 g
Manufacturer	Sanyo
Mfr Part Number	K-KJ17M3A4BA
Model Number	K-KJ17M3A4BA
Number of Items	1
Number of Packs	1
Number of Ports	4
Specification Met	Energy Star
UPC	073096902404
Unit Count	4 Count

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