For kicks and grins I sent an email to Sabre to ask if I could purchase a replacement battery. Their response was " The battery is non-replaceable". I replied that I already had the unit apart and commented on the ack of overvoltage protection on the charging circuit. Since I had it apart I again asked for a replacement. Again they said NO and also said they would forward the comment on the overvoltage issue to their quality department.
So much for customer support. I did see the Ali web site had 2/3AAA 300 maH batteries for less than $2.00 with a shipping cost of $6. Delivery in mid March!
I think I'll just pack it up and give it back.
Dan
On Friday, January 17, 2025 at 08:07:02 PM EST, Mike via groups.io <niche@...> wrote:
Interesting thanks,
Ive had few nicads & LiMH pretty much similar issues you've observed and incl trying to perturb them enough (incl slap then hard to break up shorting crystals)? to take a charge but, for my applications Li Ion's higher density more applicable and more efficient time/cost wise.
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From my observations of how duralamin was found/produced Ive experimented with putting dead or failing Li Ion's in the freezer until they reach same temp approx -15C etc then taking them out until they get to ambient then back into freezer so these cycles repeated over a few days - whilst Not charging or discharging avoiding catastrophic failure - though have trickle charged frozen Li Ion couple of times no issues so far, though would only be comfortable doing this outside in a bucket of sand with a scoop of sand at the ready...
Only after those cycles on charge at ambient temp observing charge current and rate of change of cell voltage.
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Would be good to find/design a battery cell characteriser - which reports Eg internal resistance, change in cell voltage when not charged/discharged in relation to temperature, efficiency re power not just Amp Hrs, proclivity to overheat ie temp stats during charge/discharge - so as to produce
some reference metric then serialise ie barcode stick on side of battery to track it with attention to cost/time etc
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I wonder how it would go to subject the battery to ultrasonics when charge/discharge eg to influence internal chemistry mobility etc.
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Extending the above to earlier nicads would be of interest though Id focus on large commercially useful packs, those for research could be worth it also as tool for education high school/uni etc
