loss of reserve power in a sitting battery

[back alley]

getting the kit ready for the week. the in camera battery was at half so i put it into the charger. pulled out a reserve and put it in the camera...it was at half power. i probably charged that one a week or so ago, maybe 2.
anyway it went into the charger as well. third battery was fine.

do your batteries lose power just sitting? this quickly?

 

[back alley]

i have 3 epson batteries, one is stone cold dead.

and i have 4 generic batteries, 2 at 1800mah and 2 at 1400.
the 1800 were the ones losing power. the 1400 seem fine, all new all bought at the same time.

i will eventually buy a few more as i keep getting them from different sellers in case it makes a difference.

 

[Gumby]

It is more about the chemistry of the battery, not who made them. But who makes them can be part of the problem -- there are lots of bad batteries coming from a land that sometimes makes products both cheap and inexpensive.

 

[back alley]

different sellers meaning different brands meaning maybe different batteries.

i'd get epson batteries if i could find them and if they weren't 100 bucks each compared to 5,6,7, or 8 bucks on the net.

epson canada won't reply to my emails anymore, i'd contact the main office in japan but can't read japanese to see who i could write to.

 

[Ronchnam]

R-D1 battery

R-D1 battery

Here is some information I received from a member :

Re: R-D1 batteries
The extra batteries I got were from Espow through a company in England called Battery Street (not Hong-Kong, I get cheap film and adapter rings through Hong-Kong).

They're marked as:
Replacement for NP-80
LI-ion
Batterypack 3.7V 1600mAh

They cost 8 UKP a piece and have a 1 year warranty.

There are 1800mAh batteries available, but at the lower voltage, so I guess they even out at about the same endurance.

Kind regards,

Rick

 

[kalex]

Would anybody know if these will work without issues? http://www.amazon.com/gp/product/B001FA09Z0

 

[back alley]

wow, 2000 mah!

i have never used them or seen them before but i am now also curious.

 

[kalex]

Same here. is there any danger of using these? I don't think there is but just in case want to check. if its safe to use, I'll get 2 and guinea pig them 🙂

 

[Spleenrippa]

Just wanted to say that if you guys want to learn more about lithium (or any) kind of batts, you should pop on over to the battery forum at rcgroups.com
Electric RC guys are used to dealing with setups that draw 50-200 amps. I could fry a yak with some of my battery packs ;-)
As far as no-name cells go, I'm all for them. Most of the time, brand name batteries are just relabeled OEM ones. Don't pay 2-10x more for the same thing...

 

[Rob-F]

wow, 2000 mah!

i have never used them or seen them before but i am now also curious.

I think I would be a little cautious about using batteries with a MAh rating much higher than the ones the camera's manufacturer provides. There have been issues of Lithium batteries catching fire due to internal shorts, as in the case of Sony computers. It occurs to me that the high MAh rating might have been achieved by leaving out some insulation, to make room for more Lithium. Maybe not--but it gives me pause.

 

[back alley]

we need a resident battery expert...

 

[Keith]

My son bought a battery charger for the batteries he uses in a remote controled car ... it cost forty dollars and is an amazing piece of technology. In theory it can be connected to any rechargable battery provided you can work out which contact does what. It analyses the battery as it charges it and over a period of several charges and discharges can change the behaviour of the cells siginificantly. He understands a lot more about it than I do but I noted that he was able to improve the performance of a couple of his rechargables!

He bought it here.

 

[Mr_Flibble]

*Woops, guess I am going blind*

I thought the 2000mAh Battery in that link was rated at 2.7v instead of 3.7.

 

[Mr_Flibble]

Here's a good read from Rich on Batteries:
http://www.richcutler.co.uk/r-d1/r-d1_07.htm

 

[lorriman]

I've picked up a few tips over the years.

NIMH batteries are fragile: one drop and they can be a goner: always change over something soft. The higher the capacity the more delicate: best to get low capacity for clumsey people (or NiCad). Batteries with mixed charges destroys the discharged battery: good idea to label them as groups. Dirty contacts make a big difference to rate of discharge. The higher capacity batteries lose their charge quicker but there are some new-fangled ones on the market that don't. NIMH are such a PITA that I prefer....

Li-ion: lose charge much slower, but at 100% charge they lose a disasterous 25% capacity per year (at room temp) doing nothing. 2% loss at 40% charge. 60% charge is a good compromise for storing a laptop battery as capacity loss is still quite low while you still have decent charge in case of no oppotunity for preparation. A discharged battery may automatically self-destruct after a few months for safety reasons (which is another reason to store at 40%). Some simple 3 contact batteries have a mechanism to avoid full discharge self-destruct, but it drifts upward and needs resetting with a full discharge every 30 charges. More complex batteries may not require this. If storing a laptop battery (I don't normally use mine on batteries and would rather have it still working when I do) wrap in cling-film to avoid short circuit detonations from silly accidents like spilled tea and put in a ziplock (precautions against wet but also condensation).