@baqui63 yesterday I opened the body of the massager
two mini phillips head screws that threatened to strip out at the head.
then one side has a plastic tab that needs to be pushed in.
that gets one side off.
in there is the battery, of course.
I took off the shrink wrap that encloses the battery and the apparatus that includes a small circuit board and a thin metal strap to the other end of the battery.
in fact, a “strap” is attached to each end of the battery.
it looks like detaching that from the bad battery & attaching it to the new one will be the trick.
the batteries are plentiful on Amazon.
but unless you want to buy 6 of them (or more) & a charger, they are not “cheap”.
in fact, expect to pay more (per battery) than you paid for the massager.
I bought these pair, no charger
but 6 with charger is a better deal if you have another use for the batteries - like lots of mini massagers!
I guess this post is what they mean when they say a picture is worth 1000 words, lol.
A lot of those charging circuits attached to lipo/liion batteries will not initiate a charge if the battery voltage is too low. Getting direct access to the cell(s) and applying your own charge can bring them back to life. This low voltage cutoff is 3-3.3v/cell.
I use an rc lipo charger to do it, but lacking that you should be ok supplying 4v/cell. 5v would potentially overcharge the cell although not immediately; depending on the chemistry cell voltage should never exceed 4.3-4.7v. With just a power supply you should give it power for up to 15 minutes or so then check for signs of life. With a lipo charger you can fully charge the battery.
I just resurrected an aftermarket Roomba li-ion battery pack that would not charge this way and it’s working good as new.
@djslack I notice that the LED flashes when the USB gets connected (or removed, I think), but does not stay lit while “charging”.
not sure if it is supposed to or not.
I thought maybe it was an odd connection, but could not get more than the single flash, while wiggling the connector in the charging port.
can I charge the one battery from my new battery by using some wires as jumpers?
@ekw that should work. If you had a 4 or 3.7v transformer (more common than 4 but not very common) or an adjustable bench power supply you could use that as well. USB with an appropriate resistor would also work. But the easiest would be one of your new batteries.
The common problem is that the charging circuits assume the battery is defective and will not attempt to charge a battery that shows less than 3v/cell.
You could also jumper together your new battery with the old for probably an hour or two until they equalize and then leave then jumped and plug the charging circuit in to charge them both.
@ekw i just thought some more about this. If you plan to replace the battery and don’t care about reviving the old one but just want to be sure the charge circuit isn’t bad, then jumper the new battery in parallel with the old and attempt to charge. The cells won’t be balanced but you should be able to see if it stays lit/charges pretty quickly.
@ekw jumping a new battery in parallel with the old and getting the charger to kick in could do the trick and seems the easiest course of action. If the old battery isn’t shot it shouldn’t take very long to get it above 3v and ready to accept a charge normally.
@djslack well, you were right. I think.
I jumped the battery for abt 20 minutes and that brought it to ~4v.
but - the ekw-factor came into play.
repeated handling has caused both the wires that attach to the mini circuit board that sits right on the battery to pop free.
I noticed the red one was off, and as soon as I moved the battery to get a better look, the black popped off.
so, now I can’t tell which was on which solder nub, nor do I have an iron tiny enough to attempt to reattach them.
one might have a stamp of “P+” by it.
or I could be mis-reading something unrelated.
red is +, right?
I suppose it’s 50/50 of getting it right.
so - the operation was a success, but the patient is dead.
fwiw - it still runs if connected via the USB cord, lol.
@djslack well, in keeping w/ my normal MO,
step 1 - buy $4 massager
step 2 - buy nearly $10 worth of batteries to try to fix it
step 3 - buy a HF “big” soldering gun & those alligator clip holder dinguses in anticipation of soldering in new batteries. call it $20
step 4 - break it some more while bringing battery back to life, negating the need for HF soldering gun.
step 5 - purchase $8 precision soldering iron to complete its destruction.
yeah, so I have nearly a month and 10x the purchase price sunk in this mini-vibe.
at this rate, I could have just purchased a Hitachi Magic Wand at retail and saved a few bucks.
I’ll keep you updated, but keep an eye out for house fires in southeastern PA.
at least my hands already have a bunch of burn scars.
@djslack fwiw - I bared the ends of the wires that popped off, then set the vibe to “on”, and touched the wires to the nubs.
it fired up, startling me, of course.
so, if I can get the wires reconnected, it will likely work.
the more likely outcome: I pull the OTHER end of the wires free while trying to reattach them.