does this 2.5ah battery outperform the standard 2ah unit? if so, how much??

The 2.5Ah battery will provide a bit more runtime than a 2.0Ah battery. Approximately 25% more than a 2.0Ah battery.

Is this listing for a 6 amp 40V (see picture) or 80V 2.5Ah (see heading)?

I missed that photo mess up! Looking down through the description and other toys they show are 80v. I got the Greenworks leaf blower GBA80250 80V 2.5Ah Lithium Ion Battery with a spare. The batters seems to be last longer between charges now that I have had it awhile Only issue with the blower was the tube kept coming off. Replace the wire tie with a Aero-Seal Clamps and it swings left to right with out coming off.

Can you explain why batteries are not properly marked for amps? on the 2a-144wh 80v=1.8amp, on 4a 288wh-3.6a

The reason is that the voltage of the battery is 72V nominal/80V max. Nominal is average use volts, max is extreme use volts (surges, start-up, stall prevention etc). For example, 72V x 2.0Ah = 144Wh which would be the capacity of the battery.

Will this fit in the old style drop in charger?

McGee, your question is too vague to answer. I would not know what an "old style drop charger" is. This battery has a charger made specifically for it by Greenworks. That is the only one you can use.

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Greenworks GBA80250 80V 2.5Ah Lithium Ion Battery

Product ID: 693184050

Details

Battery capacity
2.5 Amp Hours
Battery cell composition
Lithium Ion
Brand
Greenworks
Number of batteries
1 Lithium Ion
Recommended uses for product
Power Tool

Description

Rapid charge of 45 minutes to full capacity
One Battery, Multiple Tool Compatibility
On board LED lights fuel indicator for on demand reference of remaining power
Lithium-ion technology delivers maximum performance and fade free power to complete the job at hand
Compatible with 80V charger model GCH8040

Landscaping has never been easier with Green works Pro 80V Max system. The most powerful cordless battery platform in outdoor power equipment, you can now breeze through homes, corporate parks & Entertainment venues with zero gas, zero emission & Zero maintenance. Go from zero to power with a push of a button & get you through the task at hand with less vibration, less noise & less mess. With additional batteries, a rapid charger for quick charge time & a multiple tool compatibility platform, you can get all your landscaping done with all the power & performance Of gas while at a lower cost of operation. it's not just your job, it's your life.

Specifications

ASIN	B07M7WN1YS
Amperage	2.5 Amps
Antenna Location	Power Tool
Battery Capacity	2.5 Amp Hours
Battery Cell Type	Lithium Ion
Battery Weight	1452 Grams
Brand Name	Greenworks
Compatible Phone Models	/
Customer Reviews	4.5 4.5 out of 5 stars (296)
Global Trade Identification Number	00841821016418
Item Dimensions	15.2 x 9.5 x 19.7 centimetres
Item Type Name	Lithium Ion Battery
Item Weight	1.18 kg
Manufacturer	Greenworks
Model Name	GBA80250
Model Number	GBA80250
Number of Batteries	1 Lithium Ion batteries required. (included)
Reusability	Rechargeable
UPC	841821016418
Unit Count	1.0 count
Voltage	80 Volts

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