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]

Product ID: 176399900

Details

Battery capacity
850 Milliamp
Battery cell composition
Lithium Ion
Brand
Kratax
Number of batteries
4 Lithium Ion
Recommended uses for product
Alarm Alarm

⚡600 recharge cycles

🔋850mAh high capacity

🔌3.7h fast USB charging

€ 110.77

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Description

🔋 Stay charged, stay ahead — power your essentials with Kratax 9V Lithium-ion!

BUILT IN SAFETY SHIELD - Multi-protection design guards against overcharge, short-circuit, and overheating for worry-free use.
POWER THAT LASTS LONGER - 850mAh capacity delivers extended runtime beyond typical 650mAh 9V batteries.
VERSATILE COMPATIBILITY - Perfect for smoke alarms, wireless mics, toys, multimeters, and more—your all-in-one power solution.
CHARGE SMARTER NOT HARDER - Fast USB charging in just 3.7 hours keeps you powered up with ease anywhere.
ECO FRIENDLY COST SAVING - Recharge up to 600 times, drastically cutting disposable battery waste and expenses.

Kratax 9V 850mAh Lithium-ion rechargeable batteries offer high capacity and durability with up to 600 recharge cycles. Featuring fast 3.7-hour USB charging and comprehensive safety protections, this 4-pack with charger is designed for reliable, eco-friendly power across a wide range of 9V devices including smoke alarms, radios, and wireless microphones.

Specifications

ASIN	B082CQSZ86
Amperage	2.4 Amps
Antenna Location	Alarm,Alarm Detectors,Radio,Remote Control,Toys
Battery Capacity	850 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Weight	29 Grams
Best Sellers Rank	34,383 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 729 in Rechargeable Household Batteries
Brand Name	Kratax
Country of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (361)
Item Dimensions	7 x 5 x 4 centimetres
Item Type Name	9v Rechargeable Battery
Item Weight	188 Grams
Manufacturer	KrataxDirectUK
Model Name	9V Lithium-ion Rechargeable Battery
Model Number	K007
Number of Batteries	4 Lithium Ion batteries required. (included)
Reusability	Rechargeable
Unit Count	4.0 count
Voltage	8.2 Volts

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€ 110.77

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Customer service was outstanding when I had questions about the product.

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