Got 4 batteries pluged in charger, all 4 led are flashing both green and red, where when pluged just 3 batteries there is 3 solid red lights.That ok?

This means that your USB port is not supplying enough amps for the number of batteries charging. This will happen with say an older usb power adaptor. Try (i) charging less batteries at one time (ii) getting a new power adaptor that is rated for usb c or (iii) just plugging it into something that can supply enough power such as a PC.

Will they discharge if left connected to the unplugged charger? When not in use, would be handy if I can leave connected to protect the terminals.

No definitive answer on this in my experience if kept on the charger and briefly plugged back in prior to use they may show charging briefly (5_10 mins max) but this may be due to lithium batteries normal nominal loss while stored (much less than nic cads) rather than any effect of the storage being in the charger.

Are these batteries the same measurements as everyday standard 9 volt batteries. Please.

I only use these type of 9volt batteries so I couldn't say if they were the same measurements as alkaline ones. They last well until needing recharged

can you charge these on a standard multi battery mains charger

Yes, assuming there are the appropriate "press-stud" contacts on your multi-charger. This is exactly what I have. Additionally, the batteries arrived with a coupon to claim a free charger, specifically for the 9 volt batteries.

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– 9V 850mAh Rechargeable Batteries and Charger,Kratax 9V PP3 Lithium-ion Batteries,Low Self-Discharge High-Energy Battery with 600 Cycles,[4 Pack Batteries +1Pack Charger]

– 9V 850mAh Rechargeable Batteries and Charger,Kratax 9V PP3 Lithium-ion Batteries,Low Self-Discharge High-Energy Battery with 600 Cycles,[4 Pack Batteries +1Pack Charger]

Product ID: 176399900

Details

Number of batteries
4 Lithium Ion
Brand
Kratax
Battery cell composition
Lithium Ion
Recommended uses for product
Alarm Alarm
Unit count
1

⚡600 charge cycles

🔋850mAh capacity

🔒Multi-protection features

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Description

🔋 Power your passion with Kratax – where energy meets efficiency!

SAFETY FIRST - Sleep easy with built-in multi-protection features for worry-free overnight charging.
POWER UP YOUR LIFE - Experience the long-lasting energy of 850mAh capacity, outshining standard batteries.
ECO FRIENDLY CHOICE - Ditch disposables! Charge up to 600 times and save the planet while saving money.
VERSATILE COMPATIBILITY - Perfect for a wide range of devices from smoke alarms to musical instruments.
FAST CONVENIENT CHARGING - Get fully charged in just 3.7 hours with USB compatibility for ultimate convenience.

The Kratax 9V 850mAh Rechargeable Batteries and Charger set includes four high-capacity lithium-ion batteries and a fast charger. Designed for safety and longevity, these batteries can be charged up to 600 times and are suitable for various devices, making them an eco-friendly and cost-effective choice for everyday use.

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

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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₩131653

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In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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