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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