Hi do these batteries work for any battery size as claimed. the image shows renata 364 but can i use it in place of renata 377 or 394?

no , you will get only what you can see in image

is the model number for the Titan watch that I need the battery for. Would these fit or is it a different model I need

You need to look at the information in the instructions for the watch or contact the manufacturer. There are many types of batteries. And even the same watch brand can use different types of batteries. If you previously had a SR621SW / SR60 /164 battery, then the 364 battery will suit you. The photo shows a battery 364 silver oxide 364 size 6.8 x 6.8 x 2.1 mm

Are they mercury free?

According to the Renata website, all their Silver Oxide batteries contain 0% mercury.

Can this be use to replace LR621?

Yes it will replace the LR621 it has a higher capacity and silver oxide

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Renata Silver Oxide Watch Battery, 2 Pieces, 2.3 g

Product ID: 47946702

Details

Battery capacity
20
Battery cell composition
Silver Oxide
Brand
Best Price
Number of batteries
2 Product
Recommended uses for product
Watch

⏳20mAh long-lasting capacity

⚡1.55V stable power

⚖️ultra-light 2g weight

₨2260

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Description

⏰ Power your moments with Swiss precision — never miss a beat!

LIGHT AS A FEATHER - At just 2 grams, these batteries maintain your watch’s sleek profile without added bulk.
EXTENDED BATTERY LIFE - 20mAh capacity ensures your watch keeps ticking longer, minimizing inconvenient replacements.
SWISS PRECISION POWER - Genuine Renata silver oxide cells deliver reliable 1.55V performance for your premium timepieces.
VALUE PACK CONVENIENCE - Two batteries included so you’re always prepared—ditch costly watch shop visits and DIY with confidence.
UNIVERSAL COMPATIBILITY - Supports 40+ popular watch sizes including SR621SW, making it the go-to choice for quartz watches.

This pack includes 2 genuine Renata silver oxide watch batteries (model 364 SR621SW), each delivering a stable 1.55V output and 20mAh capacity. Weighing only 2 grams, these Swiss-made batteries fit over 40 watch sizes, offering long-lasting, reliable power for quartz watches. Ideal for professionals who value precision and cost-effective maintenance, this set lets you replace your watch battery quickly and confidently.

Specifications

ASIN	B00N92ZSY4
Amperage	2 Amps
Antenna Location	Watch
Battery Capacity	20
Battery Cell Type	Silver Oxide
Battery Weight	2 Grams
Best Sellers Rank	5,367 in Fashion ( See Top 100 in Fashion ) 20 in Watch Batteries
Brand Name	Best Price Square
Compatible Phone Models	Clocks
Country of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (6,928)
Item Dimensions	7 x 7 x 2 millimetres
Item Weight	2 Grams
Manufacturer	Renata
Model Name	Watch Battery
Model Number	364 SR621SW
Number of Batteries	2 Product Specific batteries required. (included)
Reusability	Single Use
Unit Count	2.0 count
Voltage	1.55 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₨2260

Duties & taxes included

In stock

Sold byAmazon Sri LankaDelivered 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 Sri Lanka.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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