Ran the three sides around its corners on bench grinder till it started exposing gap most way around. Then went a couple shallow passes on the round side opposite the connector to give it a bend point.
My first thought was hack saw it slightly in the middle and snap it in half then decided it be better to spew plastic filings all over the garage floor using the bench grinder.
That would have 2 banks of 3 cells in series. so 4400mAh/2 = 2200mAh cells
Based on the description I’d agree 100% with dchomak, it is a cheap aftermarket replacement and will have inferior cells. But, not all aftermarket replacements use cheap cells. It the states we have brands like Denaq or Maxcapacity that are quality replacements using high quality cells. Check out this interesting video of a battery factory tour. At one part they speak of a Polish branded pack using panasonics…
No problem, I was like wow this pack is impossible to open compared to all the other packs I ever opened. For the metal burrs on the end, I used my dremel and slowly sanded them down, then used my hft stick polish and the dremel cotton buffer disc and made it nice and shiny! Better than brand new looking!
No. The battery isn’t flat at 0V and the discharge curve isn’t linear.
Look at some of HKJ’s battery reviews, he actually shows the amount of current (and also energy) batteries put out when discharged at different rates. For 4.35V batteries, he shows that information for the battery charged to 4.35V as well as for the same battery charged to 4.2V.
Just finished capacity results on the first 2 batteries.Both charged to 4.16 volts with the i4 charger. I used the LittoKala Engineer 260 for discharge capacity and internal resistance and results are very good.
Battery 1 IR = 53 and 2380 MAH
Battery 2 IR = 51 and 2409 MAH
I’m not sure how accurate the IR numbers are from this LittoKala battery tester,but brand new panasonic cells are in the same range as these batteries.My conclusion is that these batteries are slightly better than the Panasonic CGR18650CG that I got last week.They measured 2210 MAH and in the low fifties IR values.I do have some very old sony laptop pulls that are supposed to be 2250 MA and only measure 1100 MA and the IR values are over 100.
I’m really glad I happened to read ur post b4 opening my pack w/ hand tools. After reading ur post I went to my grinder & ~15 minutes later (probably took that long b/c I kept checking to not grind too deep into the pack) the pack opened up like a can of sardines! My fingers especially thank you (probably my last pack was a real boar to open w/ hand tools.) I didn’t open up the pack any further after getting the plastic shell open. I’ll save that for tomorrow when I’m fresh and alert.
Anyhow, great call on using a grinder. I’m definitely going to use these method for opening pretty much ALL future packs.
On my second pack i target the slowest first the two sides of pack at the ends of cells. then the two inside corners near the connector in the front. After its just seconds to complete the rest of the front. Take a few shallow passes across the back to make a bend point. Otherwise your can of sardines will try to keep the lid closed. :bigsmile:
That was definitely the hardest pack to open that I have done, they seem to be new with all new packaging and good cells, one tiny spark in opening, all test 3.66.