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

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

Product ID: 16865928

Details

Brand
Panasonic
Color
gray
Item Weight
5.6 ounces
Output Voltage
1.2
Product Dimensions
1.25"D x x

⚡850mAh high capacity

🔆solar pre-charged & long hold

🔋2100 recharge cycles max

€ 58.90

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up smarter, last longer—never get caught powerless again!

POWER THAT LASTS - 850mAh NiMH batteries deliver consistent, reliable energy for all your devices.
READY WHEN YOU ARE - Pre-charged with eco-friendly solar power and hold 70% charge for 10 years.
UNMATCHED LONGEVITY - Recharge up to 2100 times—save money and reduce waste.
CLEAR STATUS AT A GLANCE - Four LED indicators keep you informed on each battery’s charge progress.
SMART INDIVIDUAL CHARGING - Each battery charges independently for perfect power every time.

The Panasonic K-KJ17M3A4BA pack includes a CC17 advanced charger and four AAA eneloop NiMH rechargeable batteries. These batteries offer up to 2100 recharge cycles, 850mAh capacity, and are pre-charged using solar energy, maintaining 70% charge for up to 10 years. The charger features individual cell charging with LED indicators and battery detection technology, ensuring optimal and safe charging for each battery independently.

Specifications

ASIN	B010U57MSW
Best Sellers Rank	#76,771 in Health & Household ( See Top 100 in Health & Household ) #114 in AAA Batteries #187 in AA Batteries
Brand	Panasonic
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 (2,270)
Global Trade Identification Number	00073096902404
Input Voltage	120 volts
Item Dimensions D x W x H	1.25"D x 2.63"W x 4.3"H
Item Weight	5.6 ounces
Manufacturer	Panasonic
Mfr Part Number	K-KJ17M3A4BA
Model Number	K-KJ17M3A4BA
Number of Items	1
Number of Ports	4
Output Voltage	1.2 volts_of_direct_current
UPC	073096902404
Unit Count	1 Count
Warranty Description	This product is guaranteed to be free from defects in materials and workmanship

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