Is it compatible with the 40 volt hartz battery

I'm not sure because I only have a Kobalt battery but this week I will be going to the battery store and see if they have a cheaper battery for this charger then I can let you know if it works with my charge if the battery is not a Kobalt.

Will this charge a Kobalt 40v max 2.5 Ah (this listing has 6.0 Ah) lithoum ion battery?

I have the Kobalt quick charger, 6Ah also. It nicely charges my 4Ah batteries. I think it will charge anything less than its max of 6Ah.

Does anyone know of the off brand jailipok 40v 6mah battery will work with this off brand charger?

Yes, the Jailapok 40v battery will indeed work with this charger. However, this is NOT an off-brand charger; it is a genuine Kobalt charger and it works great.

Does it work for the 4-Amp 40v battery?

Yes; I bought a 2nd charger and battery to add to what was included with the original purchase package of blower, charger, battery. The identifying information is the same on the items. I have been using them successfully for about a year.

Kobalt 40 Volt Power Equipment Battery Rapid Quick Charger Gen3

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚡ Power up faster, work smarter, stay unstoppable.

COMPACT LIGHTWEIGHT - Weighing just 2.8 pounds, this charger is easy to carry and store, perfect for busy pros on the move.
LIGHTNING FAST RECHARGE - Cut downtime with rapid quick charging that powers your tools back to life in no time.
SLEEK DUAL COLOR DESIGN - Choose between professional black or vibrant blue to match your Kobalt gear and stand out on the job.
SMART LED CHARGE INDICATOR - Stay in the know with integrated LEDs that clearly display your battery’s charge status at a glance.
UNIVERSAL KOBALT COMPATIBILITY - Seamlessly works with all Kobalt 40V max Li-ion batteries—no guesswork, just plug and play.

The Kobalt 40-Volt Power Equipment Battery Rapid Quick Charger Gen3 delivers fast, efficient charging for all Kobalt 40V max Li-ion batteries. Featuring an integrated LED charge indicator and a sleek black or blue design, this UL and FCC certified charger minimizes downtime and keeps your tools ready for action. Lightweight and compatible, it’s the essential upgrade for any professional’s toolkit.

Specifications

ASIN	B09ZSDH2LW
Best Sellers Rank	#60,452 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #178 in Power Tool Battery Chargers
Brand	BSVI
Color	Black, Blue
Compatible Devices	Kobalt 40-volt max Li-ion batteries
Connector Type Used on Cable	Kobalt 40-volt max battery connector
Customer Reviews	4.6 out of 5 stars 807 Reviews
Global Trade Identification Number	00084182101595
Input Voltage	40 volts
Item Weight	2.8 pounds
Manufacturer	Kobalt Tools
Mfr Part Number	3809906
Model Number	KRC 840-03
Number of Items	1
Number of Ports	1
Output Voltage	40 volts
Specification Met	UL, FCC
UPC	084182101595
Unit Count	1 Count

Reviews

T**N

Great product

Works as expected!

17.07.2026

J**K

40 volt charger

Works as discribed

6.08.2026

T**E

Exact replacement

Works great

3.08.2026

G**E

Works Like It Should!

Works like it should

16.07.2026

C**E

Kobalt charger

Charged in little period of time. Better than expected

23.06.2026

A**R

Works well. Fairly quick to charge.

I would buy again

8.08.2024

A**R

Pole saw

Works great! Thank you

6.06.2026

D**G

Works for Kobalt 40

This works great for charging a Kobalt 40 V battery and was way cheaper than trying to get one through Kobalt. It didn't change the battery life or charge quality. It fits the 40 perfectly and provides the right amount of power.

19.03.2025

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TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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4 days ago

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.