Are these batteries pre-charged?

Yes. But batteries have a shelf life. Even rechargeable batteries, They will slowly lose their charge if left on the shelf. So it's always wise to fully charge them before using since you do not know how long they have been sitting on the shelf.

are these low self discharge Ni-MH batteries?

These batteries say 2500 mAh on them. That is not low discharge. They work just fine in the B500. I use them normally, and keep a set of the Lithium batteries I had bought first, as a backup. So far I have not needed them. The rechargables work just fine. That combined with the 128 GB memory I have in the B500 means I can shoot just about forever. I carry two sets of these rechargables and to sets of lithium batteries with me. So far I have never had to use the Lithium. (The B500 can only indicate space for up to 999 pictures remaining. But it can use the whole card. I have never gotten it below 999 pictures remaining.)

ASIN	B01DZZL6OK
Antenna Location	Camera
Brand	Synergy Digital
Brand Name	Synergy Digital
Customer Reviews	4.4 out of 5 stars 243 Reviews
Item Dimensions	7.1 x 3.9 x 2.1 Centimeters
Item Height	0.82 Inches
Item Type Name	battery
Item Weight Unit of Measure	4 Ounces
Item dimensions L x W x H	7.1 x 3.9 x 2.1 Centimeters
Manufacturer	Synergy Digital
Model Number	COOLPIX B500-SB201
Number of Batteries	1 Product Specific batteries required. (included)
Recommended Uses For Product	Camera
Reusability	Rechargeable
UPC	724327532999
Voltage	1.25 Volts

Synergy Digital Nikon COOLPIX B500 Digital Camera Battery Replacement for 4 AA NiMH 2800mAh Rechargeable Batteries

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