Recent content by kc8adu

yet another crap cell variant. over 3600mah=B.S under 45g is suspicious too. have not seen the powder filled ones in a while. they must have gotten rid of the rest of the toxic drywall dust by now.

25r is a safe bet. btw that looks like a very common tool pack. lots of brands with only key tabs to differentiate. easy to fix with a dremel.

i find those same cells in devices that are designed to be recharged. rather wasteful to use in disposables. i tell folks all the time to save them as the cells are useful. top voltage is 4.2v

lg cells with that style print are getting pretty old now. those are hardly new. well you voided any warrenty it probably didnt have :-)

while researching battery data. found the cell database via search engine.

they are a 1500mah 15a continuous cell. and probably old age and an application that dumps them in about 5 minutes. i would replace with these. https://www.18650batterystore.com/collections/molicel-18650-batteries/products/molicel-p26a those are my go to for tool pack rebuilds. just rebuilt some...

i stuff them in 3aaa side by side items along with a tp4056 board.

i have rebuilt a bunch of bikes myself. got a goldwing tore down right now. getting that tank fixed is first. as long as its shedding crud you wont keep a carb working very long. i tear the carb down and remove any plastic. then soak in hydro seal or berrymans carb dip. blast it out with air...

you also want to vent it outside in such a way that if there is a catastrophic failure the resultant blowtorch possible at the end of the vent wont ignite anything. tight enclosure=bomb.

enough energy to blast that diode=dead driver opto. and likely other parts. on high cost parts jobs i replace everything. then test via dim bulb. idea is to have enough resistance in circuit to limit current if something gets latched up . a bulb does that and serves as an indicator.

btw the time to test all the drive parts was before reinstalling that heatsink and igbt's you have 5 identical channels so a problem one will stand out. clean off the 8 pin ic's and post the number.

got one of those chinese componant testers? since you have several identical channels grab the diode from either side. the tester will tell you if its a plain diode or a zener. the ic behind it is likely an optocoupler and bad too. any part on the gate of a failed fet is suspect. and if you dont...

can you see whos cells are in these? all the real ryobi packs i have seen had samsung or lg. had 1 knockoff that had generic 2200mah laptop grade cells. they must have thought that in 3p they could get away with it. they were beat. 400mohm beat!

YIKES! no bms. thats a disaster waiting to happen!

many cheap and nasty ups units have a timer in firmware. its not designed to run beyond its stock battery capacity. best ones are the old metal case apc and best power units. i usually set up a fan that runs from the logic so it runs in inverter mode only. metal case= probably good. plastic...