Fosmon Replacement Rechargeable LI-40B / LI-42B Battery (3.7V, 1200mAh) – 2 Pack
Product description
What this battery is for
If your compact camera suddenly runs out of power too quickly—or you’re simply trying to keep a spare on hand for trips—this Fosmon replacement rechargeable battery is designed for cameras that use the LI-40B / LI-42B battery type. It’s sold as a 2 pack, so you’re not stuck charging one battery at a time when you’d rather shoot and only think about charging later.
On paper, it follows the same “replacement” idea as buying the original battery, with compatibility targeted at specific camera models. That’s the main reason to consider it: it aims to drop in where the LI-40B / LI-42B battery is expected, rather than being a general-purpose workaround.
Key points
This Fosmon pack is positioned as a direct replacement for LI-40B / LI-42B batteries, with a stated 3.7V / 1200mAh capacity. The description also mentions using Grade A cells and claims full compatibility with the original LI-40B / LI-42B batteries.
Where it’s most practical is everyday shooting: school runs, family days out, holidays where you don’t want to get caught without a charged spare, and those times you want the camera ready for “just in case” moments.
That said, it’s still a replacement battery, so it pays to match the camera’s battery requirement carefully. If your camera uses a different battery type, this won’t be the right fit.
Where it fits, and what you’ll notice in use
A spare battery is one of those upgrades that can feel unnecessary—until you’re halfway through a day and the camera suddenly slows down or powers off. With a 2 pack, you’re effectively giving yourself the ability to rotate batteries: charge one while the other is in the camera.
The description also states “extended capacity” (3.7V / 1200mAh), so the expectation is that it should buy you more shooting time than smaller batteries. Real-world run time can vary a bit depending on how you use the camera (flash use, how often you review photos, and so on), but for most people the benefit is simply fewer interruptions.
Worth noting: if you’re a heavy shooter—lots of bursts, lots of playback, frequent flash—any replacement battery may still need more frequent charging than you’d like.
Compatibility you should check before buying
The product listing is quite specific about compatibility. It’s described as compatible with Olympus LI-40B / LI-42B, and it also lists compatibility with a range of cameras including Nikon EN-EL10, Fujifilm NP-45, Kodak KLIC-7006, and Pentax D-Li63.
It also calls out “Olympus FE-series” and “Olympus MJU series” camera ranges (with many model names listed). The safe approach here is straightforward: confirm your exact camera model appears in the compatibility list, or that your camera’s battery requirement matches LI-40B / LI-42B.
Tech specs
- Name: Fosmon Replacement Rechargable LI-40B / LI-42B Battery
- Type: Rechargeable battery (replacement)
- Format: LI-40B / LI-42B compatible
- Capacity: 1200mAh
- Display: N/A
- Voltage: 3.7V
Pros, cons, and who should consider it
Why it makes sense: - It’s sold as a 2 pack, which suits people who want a ready spare. - It targets LI-40B / LI-42B cameras directly, including a detailed compatibility list. - The listing highlights Grade A cells and a stated extended capacity (3.7V / 1200mAh).
Why you might skip it: - The listing stresses compatibility with specific batteries and models, if you’re not sure your camera matches, you could end up buying the wrong type. - Replacement batteries can’t be guaranteed to behave exactly like the original in every camera across every usage pattern—so if you’re relying on maximum performance for long events, it’s worth setting realistic expectations.
It’s a better match if you’re after practical value: keeping your compact camera usable without treating battery charging as a daily chore.
Should you buy it?
It’s a good fit if your camera uses the LI-40B / LI-42B battery type and you want a reliable spare, ideally to rotate during the day. The 3.7V / 1200mAh specification and the inclusion of a 2 pack are the main reasons this one works for everyday photography.
You may want to skip it if you don’t have your exact camera model confirmed as compatible, or if you’re expecting this to behave like an identical original battery in every scenario. Replacement batteries can vary in how much “extra” you get depending on usage, so check the compatibility list first.
Mini FAQ
Is this battery a replacement for the LI-40B / LI-42B type? Yes—it's described as a replacement rechargeable battery specifically for LI-40B / LI-42B.
What capacity and voltage does it use? The listing states 3.7V and 1200mAh.
Does it come as a single battery or multiple? It’s sold as a 2 pack.
Which cameras is it compatible with? The listing names compatible camera models including Nikon EN-EL10, Fujifilm NP-45, Kodak KLIC-7006, and Pentax D-Li63, and includes long lists for Olympus FE-series and MJU series. Check your exact model against the compatibility details.
What should I double-check before ordering? Match your camera’s battery requirement to LI-40B / LI-42B and verify your model appears in the compatibility list provided on the listing.