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 Rechargeable Li-ion Battery,Kratax 850mAh 9V Battery Rechargeable,2 Pack 9V Batteries with Protection Board for Smoke Detector Alarm,Fire Alarm,Multimeter,Radio Microphone,Kids Toys Battery

9V Rechargeable Li-ion Battery,Kratax 850mAh 9V Battery Rechargeable,2 Pack 9V Batteries with Protection Board for Smoke Detector Alarm,Fire Alarm,Multimeter,Radio Microphone,Kids Toys Battery

Product ID: 171269027

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Details

Number of batteries
2 9V batteries
Brand
Kratax
Battery cell composition
Lithium Ion
Compatible phone models
Multipurpose
Recommended uses for product
Smoke detector

⚡2.3A output current

🔋850mAh capacity

♻️500+ recharge cycles

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Description

🔌 Power Up Your Life with Kratax!

SAFETY FIRST - CE/RoHS certified with multi-protection features for worry-free overnight charging.
RAPID RECHARGE - Fully charge 4 batteries in just 4 hours, keeping your devices powered up and ready.
ECO FRIENDLY POWER - Rechargeable over 500 times, reducing waste and saving money.
INDEPENDENT CHARGING - Charge each battery separately with a USB Type-C cable for ultimate convenience.
VERSATILE COMPATIBILITY - Perfect for a wide range of devices from smoke detectors to remote control toys.

The Kratax 9V Rechargeable Li-ion Battery offers a robust 850mAh capacity, allowing for over 500 recharge cycles. Designed with safety in mind, it features multiple protection mechanisms and is compatible with a variety of devices, making it an essential power source for both everyday and specialized electronics.

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