Can you leave them plugged in and seated in the charger after they are charged?

The charger LED go from red to green when fully charged. I have left them on for a few hours extra and detected no extra heat. So I think the charger or batteries are smart enough to stop charging. Lithium has a low self discharge so I don't see any benefit to leaving them plugged in after they're fully charged.

What size are these batteries? Are they the same size as standard alkaline batteries?

Loring Chien , Electrical Engineer for 45 years & IEEE Sr. Life member Answered 2 years ago · Author has 39.4K answers and 75M answer views I presume you are asking about Alkaline chemistry batteries. Their capacity is maybe on the order of 400 mAh. Actual capacity depends on the current value and the temperature. At higher current values the capacity is always smaller. And of course it varies some by manufacturer. this manufacturer rates these as 850mAh ......?

How long does it take to charge the batteries? Mine have been charging for 12 hours and still flashing red lights.

The 9V batteries come with an initial charge (although how full I do not know). I remember placing them in the charger overnight, so I can't speak to when exactly they reached a full charge? I would recommend that you unseat the batteries and then slowly re-seat them. I found that it worked best if I did so in a rocking motion: one edge in place and then rock forward until firmly seated. Perhaps they're not fully connected? Otherwise, contact Hixon customer service in the event you have a defective charger and they need to replace.

Can the Charger be used to charge other types of 9volt rechargeable batteries?

Hi, Yes it is a basic charger for most 9 volt batteries

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- 9v Rechargeable Batteries,9 Volt Rechargeable Batteries with Charger kit,4-Pack 850mAh 9v Lithium Batteries for Alarms Wireless Microphones Smoke Detectors Toys Flashlights and More

- 9v Rechargeable Batteries,9 Volt Rechargeable Batteries with Charger kit,4-Pack 850mAh 9v Lithium Batteries for Alarms Wireless Microphones Smoke Detectors Toys Flashlights and More

Product ID: 200693978

Details

Battery Capacity
850 Hour (mAh)
Battery Cell Composition
Lithium
Brand
Hixon
Number of Batteries
4 9V batteries
Recommended Uses For Product
Calculator GPS

⚡850mAh high capacity

🔋2000 recharge cycles

🔌4-channel fast USB charging

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11062 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up smarter, last longer, and never miss a beat!

CHARGE GO - Fast USB charger with 4 independent slots and LED indicators for effortless power management.
BUILT TO ENDURE - Up to 2000 recharge cycles means fewer replacements and less waste—eco-smart energy.
CERTIFIED SAFETY - CE, RoHS, and MSDS certified with smart protection for worry-free use in critical devices.
POWER THAT LASTS - 850mAh lithium capacity delivers up to 3x longer life than standard 9V batteries.
UNIVERSAL COMPATIBILITY - Perfect for alarms, wireless mics, smoke detectors, toys, and more—always ready when you are.

The Hixon 9V Rechargeable Battery Kit includes four 850mAh lithium-ion batteries and a USB charger with four independent charging channels. Designed for high performance and longevity, these batteries support up to 2000 recharge cycles, significantly outlasting traditional alkaline options. Certified for safety and equipped with smart protection, they are ideal for smoke detectors, wireless microphones, toys, and other 9V devices. Fast charging with LED status indicators ensures convenience and reliability for the modern professional.

Specifications

ASIN	B07ZJCHXZB
Amperage	1.5 Amps
Antenna Location	Calculator, GPS, Remote Control, Toys
Battery Capacity	850 Milliampere Hour (mAh)
Battery Cell Composition	Lithium Polymer
Battery Cell Type	Lithium Polymer
Battery Weight	12 Grams
Best Sellers Rank	#88,769 in Health & Household ( See Top 100 in Health & Household ) #20,863 in Household Supplies
Brand	Hixon
Customer Reviews	4.6 out of 5 stars 422 Reviews
Item Dimensions	0.79 x 0.79 x 0.79 inches
Item Weight	2.18 Ounces
Manufacturer	Hixon
Model Number	K007
Number of Batteries	4 9V batteries required. (included)
Recommended Uses For Product	Calculator, GPS, Remote Control, Toys
Reusability	Rechargeable
Voltage	9 Volts

Reviews

K**L

16.12.2025

H**U

6.09.2020

T**R

10.03.2026

C**Y

4.06.2025

A**K

29.04.2026

H**R

27.02.2024

W**A

26.03.2026

D**O

30.12.2025

K**B

29.10.2023

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

11062 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

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