Citizen BM8186-07E Eco-Drive Field Watch

Citizen BM8186-07E is a men’s field-style watch that uses Eco-Drive technology to convert natural or artificial light into stored energy. This avoids routine battery changes according to the manufacturer, while customer feedback reports a simple design and good functionality alongside some concerns about strap length.

At a glance

Eco-Drive is described as converting light into energy stored in a rechargeable cell.
The manufacturer says the watch can charge from sunlight and everyday indoor light sources.
Customer feedback describes a straightforward field-watch design and good functionality.

Price

£83.69Save 15%

Reference price: ~~£98.69~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

Light-powered charging is intended to reduce the need for battery changes.
Indoor light as well as sunlight is listed as a charging source.
Reported feedback includes positive comments about durability and long-term use.

Technical specifications

7 specifications

Identity
Brand	Citizen
Model	BM8186-07E
Department	Men's
Country of origin	China

Power
Power technology	Eco-Drive technology powers your watch using natural or artificial light
Energy storage	permanently rechargeable lithium-ion cell

Listing details
Package dimensions and weight	19.5 x 18.5 x 10.8 cm; 240 g

What to know before buying

Customer feedback is mixed on fit. Some buyers say the size is not too large, while others report that the strap feels too short.

Listing details to confirm

The product details list “1 A batteries required. (included)”, which conflicts with the Eco-Drive description that says the watch uses a rechargeable cell and avoids battery changes. Confirm the power and battery details for the selected listing.

Who is it for?

A good fit for

Buyers seeking a men’s field-style watch with a simple design.
People who prefer a light-powered watch and want to avoid routine battery replacements.
Those comfortable checking strap fit before purchase.

Less suited to

Buyers who need a confirmed strap length before ordering, as none is stated in the supplied details.
Anyone who requires the listing’s power and battery information to be unambiguous before buying.

Citizen BM8186-07E Eco-Drive Field Watch · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 341 ratings

5 stars67%67%
4 stars19%19%
3 stars8%8%
2 stars2%2%
1 star4%4%

Customer feedback describes a simple field-watch design, good functionality and perceived durability, including a report of extended use without missing a beat. Some customers consider its size manageable, but others say the strap is too short. For buyers drawn to the stated light-powered design, the reported durability is encouraging, while strap fit remains a practical uncertainty. Aggregate ratings lean positive, but do not explain individual experiences.

Positive themes

Customers describe the design as simple and field-watch-like.
Feedback highlights functionality, perceived durability and value.

Negative themes

Some customers report that the strap is too short.
Some negative feedback concerns fit.

Mixed feedback

Customers differ on size, with some finding it not too large and others raising fit concerns.

Frequently asked questions

How is the Citizen BM8186-07E powered?

The manufacturer describes Eco-Drive charging from natural or artificial light, with energy stored in a rechargeable lithium-ion cell. The product details also say an A battery is required and included, so the listing’s power information is inconsistent.

Can it charge from indoor light?

The manufacturer says it can charge from everyday light sources such as indoor fluorescent lights and desk lamps.

What do customers say about the strap fit?

Feedback is mixed. Some customers find the watch’s size manageable, while others say the strap is too short.