Igor wrote:
"I wonder how well a "regular" AA-batteries charger (such as my La
Crosse) would work with those."
It can't. The Kentli's have a separate +ve charging ring at the top to
bypass the 1.5V circuitry & connect directly with the 3.7V Li-ion core.
Alan C
On 14-May-19 11:50 PM, Larry Colen wrote:
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
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