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Energizer 850mAh NP-FW50?

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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Topic: Energizer 850mAh NP-FW50?
    Posted: 23 January 2021 at 19:22
Did a search (here and the wider web) and came up blank.

Has anyone tried an Energizer NP-FW50 in an a6xxx or a7 series body?
eBay item: 402314821752 for those in the UK
They also make them for other camera brands.

This is listed as an NP-FW50 alternative. But also shows as only 850mAh
My a7 II Sony battery is 1020mAh.
So, I guess at full charge it'd just be about 80-something%?
And/or just - obviously - not last as long per charge.

Sony street price in a reliable camera store are about £55 to £60.
The Energizer is £20. Good/bad/ugly?
I'd rather buy a well known brand that one of the dubious $5 options littering eBay.
Is this just being silly?

The Sony is a bit pricey. Haven't needed the spares I got for my RX100 IV (the spares I got and haven't used look like they cost about $1 to make and are ready to fall to pieces). Kinda reluctant to drop £55 if I'm not certain I'll use a spare but want a spare.

Edited by dCap - 23 January 2021 at 19:31
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2021 at 21:24
I have no experience with those specific batteries, but I bought a pair of Tera 1950 mAh NP-FW50's which are supposed to last almost twice as long.

I didn't actually measure it but I had the impression they did, but only for the first two or three cycles. Now they last shorter than most of my genuine Sony ones , but they were 25 for the pair including a charger so still not a bad deal and you get what you pay for.


If you think you could live without a spare battery maybe you can apply a different strategy and buy a decent powerbank and when the battery gets a bit low while being out connect that to the USB port during the times you're not photographing and push a little extra energy in to last your whole outing.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2021 at 21:50
You might want to take a look at this thread. Like I say there, I have a Wasabi battery that is fine. I have a Jupio battery for my Canon cameras, but I have not used it enough to be sure how it behaves over time.

In general, if you think you can get by with your main battery and the Energizer is just for those times you need more, then 20 GBP is not much. Else I preferred buying native batteries.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2021 at 23:04
In the NP-FW50 case size the stated capacity is almost irrelevant because the actual run time is driven mostly by the battery's internal resistance - all cameras with NP-FW50 batteries shut down before full capacity is reached because the cell voltage drops below the permitted minimum (assuming AF is being used frequently).
It is possible that the lower capacity may give a longer run time than the higher capacity if the construction gives a lower cell resistance. Personally, I would not believe a capacity of 1950mAh from an NP-FW50. Such claims are usually barefaced lies, as is easily proved by removing the plastic case and inspecting the cells inside.
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Post Options Post Options   Quote Costas Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 04:57
Originally posted by Miranda F Miranda F wrote:

I would not believe a capacity of 1950mAh from an NP-FW50. Such claims are usually barefaced lies


Unfortunately this is very common these days with cheap batteries.

I find that in general, the 'cheap' batteries just end up as being false economy in the long run.

A few tips for those not familiar with lithium cells and how to ensure that you extract maximum life from them:

    Don't discharge them all the way down to 0%. Ideally you want to maintain approx. 5 to 15% charge in the cell when flat - consider that as the time to swap over or charge your battery.

    Don't charge them to 100% and then leave them in your cupboard for weeks on end. Ideally charge them to 100% just before, or a couple of days before you intend to use them. Lithium cells being left unused for extended periods at full charge state will degrade faster.

    When not in use, lithium cells prefer to be stored at approx 40 to 50% charge state to minimise cell degradation. Worst case is to leave them dead flat which can then cause irreversable damage over time as their voltage drops further due to self discharge.

    Don't store them at elevated temps.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 09:47
All good advice. I'd add one more thing - don't leave Lithium batteries in cameras or phones for months unused, as the electronics remains powered (at a low level) and will continue to discharge the battery. This is much more noticable on the Nex 6 than A-mount cameras.

On the other hand, some suggest that leaving the battery out for long periods loses the date and time info which is annoying to have to re-enter. I compromise by putting an old rubbish battery in when I'm not using the camera and leaving charged ones on the shelf ready.
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 12:50
Originally posted by Miranda F Miranda F wrote:

All good advice. I'd add one more thing - don't leave Lithium batteries in cameras or phones for months unused, as the electronics remains powered (at a low level) and will continue to discharge the battery. This is much more noticable on the Nex 6 than A-mount cameras.

On the other hand, some suggest that leaving the battery out for long periods loses the date and time info which is annoying to have to re-enter. I compromise by putting an old rubbish battery in when I'm not using the camera and leaving charged ones on the shelf ready.


I suggest that not using a camera for a long period of time means it is time to sell it and get something you will use

But that is easy to say when you shoot almost daily.

A7II - I bought the Energizer - which arrived super quickly - and is now charged (via the generic external charger I got). The battery reports, in camera, at 100% which I was unsure about as it is only 850mAh. Will be a few days/weeks before I can comment on how long it lasts in actual use. Popped the Sony one back in which dropped to about 85% just during menu/settings set-up!

RX100 - Even though I got a charger + 2 cells for my RX100 IV I just got into the routine/habit of charging the one Sony battery every 3-4 days.

I like the fact that both cameras offer the option to charge internally but I'd not rely on it for regular heavy use. The door/flap over the mUSB cover on both cameras looks to be of a very low standard and not designed for heavy use (which is why I think NOT including an external charger for both models is a poor choice). Well, that and the official Sony price of Sony's own charger/cells.

Factor in that the generic chargers (about $10) are being made by Company A in China, sold to Company B (locally in bulk) and then sold on to the customer.
Both Company A & B are making a (small) profit. This means that the Sony chargers at £85 are about £80 margin? Not a good look. The other camera companies do this too (and not just Leica) - e.g. Ricoh charges about £35 for a metal ring around the GR series, which likely costs $1 to make.

Making the first part batteries (£60) and charger (£85) vs the generic prices (£10 and £15?) will force most people to buy the generic. If the Sony charger was £25 and the battery £30 I'd buy Sony. There must be a tipping point where people will stay on brand. I'm sure Sony enjoys seeing the £85 sales but predict they would sell considerably more if priced better.

Edited by dCap - 26 January 2021 at 14:25
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Post Options Post Options   Quote Minolta55 Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 16:07
One thing I noticed about these third party batteries and their chargers is they only have two pins, while SONY has three pins. I guess the third pin is where the "info" about the battery comes through.

I read somewhere that a guy took apart these third party cheap batteries and they didn't have any circuits of any kind in there to prevent over-voltage and stuff like that.

Why risk a piece of expensive equipment for a few dollars by buying cheap batteries?
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 16:16
Originally posted by Minolta55 Minolta55 wrote:

(clip) Why risk a piece of expensive equipment for a few dollars by buying cheap batteries?


I have been this way of thinking for about 10 years.

But if camera shops push third party cells at time of purchase (they did for a fujifilm camera I bought) then that is the camera store telling me that the battery will work fine. If it didn't and caused a problem I would be back to the camera store to discuss what happens next (with my full refund).

I bought my Energizer cell for £20 (delivered) instead of the Sony cell for £60 mainly as I'm not 100% sure I need a spare. But don't want to find out I do need a spare on the day I lose power. I shot the RX100 daily for 6 months and never needed the spare (stopped carrying the spare after the first week). I'll pocket the Energizer and see if it ever gets used. At £20 that is something I'm happier to do than drop £60. If I find myself regularly using battery #2 and/or if I found the Energizer to be poor performance then I'd go get a Sony cell as I 'know I need it' then.

Today, I'm just in a zone where I don't know if I need it. I wasn't prepared to go to the extremely low prices I've seen for un-labelled ones. Probably come out of the same factory as the ones with Energizer or Duracell written on them but I stayed with a brand sold in a camera shop.
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Post Options Post Options   Quote Minolta55 Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 16:38
Originally posted by dCap dCap wrote:

[QUOTE=Minolta55] (clip) But if camera shops push third party cells at time of purchase


All electronics retailers including cell phone shops push accessories where they have a huge profit margin. They don't get the same pushing brand name products.

That being said energizer and other companies are reputable and should be okay. My concern is all those Chinese batteries.

Remember the Samsung phone explosion fiasco a while back where it was banned from all flights?. Turns out Samsung had outsourced their battery production to China.

Usually, companies have their strict QC even though it's manufactured in China, but in Samsungs case, they had just outsourced even the materials and such. If Samsung cannot control its own battery production in China what does that say about other ones that are totally on their own with no oversight?

So I don't risk these cheap batteries at all. If a lot of people are using it and have no issues, then it speaks to the resiliency of the camera electronics that is preventing it from blowing up.
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Post Options Post Options   Quote dCap Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 16:47
I would expect a camera shop to get a better margin on a £60 Sony battery than the £15 generics that they sell.

The fact that the shop (which stocked fujifilm's own cells) recommended the third party one seemed odd to me. They even discounted them because I was buying two cameras and two lenses and a bag all in one go - they could have easily dropped a bit from the Fujifilm battery price it wouldn't have made much difference to the final price.

I disagree with the blanket 'everything from china is rubbish' sentiment though. That just demonstrates a very poor understanding of how outsourcing works.
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Post Options Post Options   Quote Minolta55 Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 17:48
I didn't say everything from China is rubbish. Apple makes its products in China but it's all about who is enforcing quality control.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 18:42
Firstly: welcome to Dyxum, Minolta55

China makes really good stuff and really lousy stuff. Unfortunately always with a so-so human rights record. The Samsung battery fiasco was completely Samsung, it doesn't matter where it was made, it was under the Samsung brand.
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 23:03
The third pin is either a serial data connection (on some batteries with a 'petrol gauge' built in), or a simple thermister (on some older ones) which tells the camera/phone/etc how hot it is.
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