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The point is: the internal R (or Z) of an alk 9v is not all that much more compared to NiMH:
Alk 9v -- about 1.5-1.7 Ω according to **broken link removed** and http://www.electronicspoint.com/do-calculate-battery-internal-resistance-t10177.html and...
But one can't EASILY re-wire the CELLS w/diodes in a commercial 9v BATTERY ...
**broken link removed**
... and of all the 9v NIMH batteries I've seen INTERNALLY, none -- IAC -- have diodes. And a diode(s) between parallel 9v BATTERIES does barely anything ... you've still got the full...
WRONG!
Sometimes matching the plug to the batt terminals -- in a dark room, or if you have poor eyesight -- can lead to bass-ackward cond. (they just need to make contact momentarily, not plug in, to do damage downline). The pwr switch may be off, but if you've got electro caps --- boom. Also...
Just to be clear: I'm talking about PERSONALLY (ad hoc) using two/more 9v NiMH batts connected in parallel. This is totally independent of manufs' suggestions (and there are no specifics -- hence gray area) for NiMH powering devices with their cells/batts in this. It's not in their Application...
There is a diode placed immediately following the POS (+) terminal of each battery. This is an anti-rev-chg-protect feature. But that does not prevent them from charging EACH OTHER. IAC, I usually disconnect them from the device after use as they are ready for recharging anyway...On that note: I...
Couple of things ...
The danger aspect you allude to makes no sense. The rapid chargers used for NiMH often make the batts VERY warm -- this never happens with running respective NiMH batts in parallel (they don't even feel mildly warmer in parallel (than single)). Since heat is an enemy of...
This seems to be the same UN-referenced "answer" Tangent provided in quote from my OP.
Two problems:
(a) Science-based proof not provided (more than a sentence response -- links, refs, work too, etc.)
(b) My experience in paralleling 9v batts: using two UNmatched 9v batts (an Eveready [7.2v] and...
I have a headphone amp -- similar to the one that takes 9v batt., noted above -- that incorporates 8 AAA. It has a built-in charger (they charge in SERIES, I think) and gets quite warm when doing so -- that doesn't inspire a lot of confidence (i.e, the audio electronics getting baked in there)...
Yeah, they are different -- especially WRT quality (= reliability and longevity). Maha Energy (maker or Powerex and Imedion NiMH) makes absolute junk -- 9v, AA, AAA, even their chargers! This is a major Japanese company which make their poor quality all the more surprising.
9v batts. are...
There are conflicting views on whether one can "safely" use 9v NiMH batteries in PARALLEL -- by "safe", I mean mostly for battery longevity as opposed to fire/explosion risk. One may want to do parallel as the mAh of most NiMH 9v single batts kinda sucks, so multiple parallel batts may be better...
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