The fact that a lithium-ion battery "works" under normal circumstances
should be no consolation. The problems come about if the thing should
get short circuited or overcharged (as might happen when leaving it in
the charger overnight) From the review:
--------------------------------------------------------------------
On the discharge test the control board battery voltage monitor IC did
eventually cut the pack off completely but it clearly had some problems
switching the pack off as the expanded discharge graph shows. It
eventually operated at about 3.65 volts. This is quite low, and gives
questionable protection for the pack. As with many lowest-cost packs
there is no polyfuse for protection against short circuits, a lamentable
omission. The charge control device is not a proper thermistor but just
a resistor on the end-mounted PCB.
--------------------------------------------------------------------
In other words a potential fire or explosion hazard. There's a reason
why reputable lithium ion batteries don't sell for $5.
Chuck Norcutt
wiliam Wagenaar wrote:
> Under "Avoid at all costs" I see the e-film battery mentioned.
>
> I received one with my E-1 almost 5 years ago and it still functiond
> flawlessly although I feel it has a bit less capacity than the original
> battery. I sometimes leave it in the charger overnight and have not had any
> problems so far.
>
> Just my experience.
>
> Wiliam
> ----- Oorspronkelijk bericht -----
> Van: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> Aan: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
> Verzonden: Maandag 23 november 2009 23:35:26 GMT +01:00 Amsterdam / Berlijn /
> Bern / Rome / Stockholm / Wenen
> Onderwerp: Re: [OM] Replacements for Oly BLM-1 Batteries
>
> Martin has it right according to this page:
> <http://t5r.pwp.blueyonder.co.uk/e1/clonetests.htm>
> The data is getting a little long in the tooth and the brands are what's
> available in the UK and not necessarily Oz. But it's an excellent read
> even if you can't get your hands on the recommended brands. There are
> some warnings there about what's likely a fire/explosion hazard due to
> substandard construction.
>
> From the summary section
> ------------------------------------------
> Overall winner - UNiROSS VB104295
>
> Second place - Energizer OM-1
> Third place - Olympus BLM-1
> Fourth Place - Hahnel HL-M1 (note 1, 2)
>
> Best capacity - UNiROSS VB104295
> Best value for money - 7DayShop PS-BLM1
>
> AVOID AT ALL COSTS
>
> Sterling Tek WT-BLM1 (note 2)
> 'WinTop' PS-BLM1 'Olympus' clone
> e-Film (Delkin) PS-BLM1
> 'Cb' BLM1 clone
> ------------------------------------------
>
> AFAIK, UNiROSS isn't sold in the US. But my second battery for my 5D is
> an Energizer CR-590 which I've owned for over 3 years and it seems to be
> going as strong as the Canon BP-511A that came with the camera. They
> get roughly equal usage. But there isn't a great savings. The
> Energizer is about $35 and the Canon original at B&H is about $50.
>
> Chuck Norcutt
>
>
>
> Martyn Smoothy wrote:
>> Uniross - bought one years ago when I first got the e-1 - at least as
>> good as the oly original.
>> Not sure where you could get one these days...
>>
>> Martyn Smoothy
>>
>>
>>
>> Wayne Harridge wrote:
>>> I have a few BLM-1 clones purchased from China/Hong Kong which do not have
>>> anything close to the capacity of the original Oly batteries which came
>>> with cameras.
>>>
>>> I'm looking for some good value replacements - any recommendations ?
>>>
>>> ...Wayne
>>>
>>> Wayne Harridge
>>>
>>> http://lrh.structuregraphs.com
>>>
--
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