The google monster points to quite a few rechargeable 2cr5 batteries
https://www.google.com/search?q=2cr5+battery+rechargeable&client=firefox-b-1-d&source=lnms&tbm=shop&sa=X&ved=0ahUKEwi3vqq__pviAhWItZ4KHUwYAxkQ_AUIDigB&biw=1344&bih=781
For rechargeable AA my preferred battery is the Eneloop Pro (black, high
capacity). They have a low self discharge, which means that even a year
after charging they still have most of their charge. The high capacity
don't have quite as many recharge cycles as the low capacity, but for me
it's worth it to get that many more flashes out of the speedlight.
https://www.google.com/search?client=firefox-b-1-d&biw=1344&bih=781&tbm=shop&ei=kjfbXODBK4fb-gSavIHoDg&q=eneloop+high+capacity+AA&oq=eneloop+high+capacity+AA&gs_l=psy-ab.3..33i299k1l3.10754.12700.0.13952.3.3.0.0.0.0.216.377.2j0j1.3.0....0...1c.1.64.psy-ab..0.3.377....0.5h0TePERbBE
Igor PDML-StR wrote on 5/14/19 1:47 PM:
Alan, thank you for pointing out to KENTLI batteries.
I've missed that development, - the rechargeable AA Li-ion batteries.
But the price is ...argh!... not even biting, rather - eating you alive:
$37 for 4 AA batteries!
https://www.amazon.com/KENTLI-Rechargeable-Battery-Lithium-ion-Batteries/dp/B019O4WISY
Just in case, (I almost got fulled by that), instead of the battery
capacity listed in mAh as it is done for all Ni-Meh AA's, they list it
in mWh. To bring it to the same scale, you need to divide that but the
voltage. I.e. 3000 mWh / 1.5 V = 2000 mAh, which is a good, but not
enormous capacity as might seem.
I wonder how well a "regular" AA-batteries charger (such as my La
Crosse) would work with those.
A nice thing is that are already some 3rd party batteries available for
a lower price: $26 for 4, but with a slightly lower capacity of 2775 mWh
(i.e. about 1850 mAh).
I've also found rechargeable lithium-ion AA batteries that have
individual micro-USB plugs:
https://www.amazon.com/Rechargeable-Batteries-Battery-Li-ion-Long-Lasting-High-Capacity/dp/B07D9K2H9H
I am not sure these are practical.
First, they are rather expensive ($20 for 4). Second, the capacity is
small: 1250 mAh.
Third, in many (most?) applications, they are used in a set of 4,
sometimes 3 (remotes and kids' toys), or at least 2 (remotes).
I'd rather have the full set recharged at once in a 4-battery charger,
than have 3-4 USB cables used for that.
Cheers,
Igor
Alan C Mon, 13 May 2019 21:58:16 -0700 wrote:
A pair of R-CR-V3's worked very well but, freshly charged, they could
deliver 7.4V which apparently fried the camera electronics in some
cases. This led to the Pentax warning. Nevertheless, many 1stD & K100D
owners still used them successfully without incident. A workaround was a
single R-CR-V3 with a pair of R-AA's which gave a "safe" max. starting
voltage of about 6.5. I did this successfully for some years with my
K110D - still do occasionally. I had one set in the camera & another on
charge. The problem with 4 R-AA's is that the starting voltage is only
5.6 and it doesn't take long to get to the cut-off of 4.8V. Not too long
ago, KENTLI introduced Li-ion's in AA format with circuitry to limit
them to 1.5V. I have no experience of those but if the underlying
starting voltage of each is 3.7V (limited to 1.5V) they should last for
ages.
Alan C
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
