4-Pack Tenavolts AA Lithium Rechargeable Batteries ...

4-Pack Tenavolts AA Lithium Rechargeable Batteries w/ Charger $12 at Amazon

$12 $35

$12 retail: $35

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Posted by Sharik
06/25/2019 at 11:22 AM PT

Comments & Reviews (2)

schmoe90

Ben's cred: 400

Posted 06/28/2019 at 09:47 AM PT

$11.90 with free shipping, as they're $35 before the coupon :) Interested to see how they do.

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dave_c

Ben's cred: 5862

Posted 07/02/2019 at 09:20 AM PT

These are interesting cells, have an undersized 3.7V Li-Ion inside and a buck regulator to output a constant 1.5V till the safety shutoff kicks in.

I doubt you can charge them with any other charger, including a standard Li-Ion 14500 charger, but they could be great for poorly designed devices that run out of voltage before their series of cells is fully drained, for example if a series of 4 x AA got down to 4.8V and it was too low for the device while 4 x of these would stay at 6V.

However the total capacity is misleading in being stated as mWh instead of mAh. If they're at least honest with the math (which is anyone's guess) then the Li-Ion cell inside is 2775/3.7 = 750mAh.

The effective impedance of the cell plus buck converter seems to be higher than with NiMH cells, so they aren't good for very high drain devices like camera flashes, some LED flashlights, really anything that runs a cell down in an hour or so of continuous use.

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