As some may be aware I am true diyer and that includes batteries , well today I had to virtually bin a 974wh PF soft pack (a decent size being 7p 13s).
As with all my batt's I check on a 4 - 6 week cycle to see that nothing untoward is occurring, this one only being checked some 4 weeks ago and all looking good as usage hasn't been great during lock down. Knew something was wrong as soon as I turned in the voltage gauge and no reading at all, so took it indoors and pulled the sense connector to measure cells. What a shocker they had all collapsed to less then 1v per group and some as low as 0.4v.
I haven't yet stripped it down to get to the cells but expect either the BMS to be at fault and draining the cells or catastrophic collapse of the cells which seems unlikely not much of a biggy as I bought a job lot of cells (100+) a few years ago for £100 from a battery guy on here so a cheap layout as far as cells's go.
When time allows I shall split the cells in to there groups first then back to singles and check each one to see if any give a clue, as for the BMS not much one can test for except to wire it up to again to test/monitor it on another set up.
I have a pair of aged well used and abused 29E packs of 5p 10s so these I will strip out of the case and reconfigure in to a large 48v soft pack for temporary use , they sag a bit but are usable on low power.
I have two Oxydrive cases and the mount, I liked the case style and prefer them over the Dolphin 09 case. Just now need to source some cells decent cells to re -use them again, previously they were 5p10s using the mediocre Sam 22 & 26F cells. 4p 13s might fit inside if not certainly 4p 12s will.
Good genuine li-on cells are a very thin on the ground at the mo, so will have to see who has any stock. My last cells were genuine LG HG2 from a UK warehouse source so may be my next look to see what they have in stock. I had a mail shot a few weeks back to say they have new Molicell stock, Molicell are a Canadian Co. I believe but like all cells most are produced in the Far East or these in Taiwan, Moli's reportedly are very similar if not clones of the VCT5 & 6. They follow similar mah and current stat's.
On Ecf forum Mooch has tested and rates them as best all round 18650 and better the Sony's excellent VTC5A.
Any one used Nkon at all this year ?
As with all my batt's I check on a 4 - 6 week cycle to see that nothing untoward is occurring, this one only being checked some 4 weeks ago and all looking good as usage hasn't been great during lock down. Knew something was wrong as soon as I turned in the voltage gauge and no reading at all, so took it indoors and pulled the sense connector to measure cells. What a shocker they had all collapsed to less then 1v per group and some as low as 0.4v.
I haven't yet stripped it down to get to the cells but expect either the BMS to be at fault and draining the cells or catastrophic collapse of the cells which seems unlikely not much of a biggy as I bought a job lot of cells (100+) a few years ago for £100 from a battery guy on here so a cheap layout as far as cells's go.
When time allows I shall split the cells in to there groups first then back to singles and check each one to see if any give a clue, as for the BMS not much one can test for except to wire it up to again to test/monitor it on another set up.
I have a pair of aged well used and abused 29E packs of 5p 10s so these I will strip out of the case and reconfigure in to a large 48v soft pack for temporary use , they sag a bit but are usable on low power.
I have two Oxydrive cases and the mount, I liked the case style and prefer them over the Dolphin 09 case. Just now need to source some cells decent cells to re -use them again, previously they were 5p10s using the mediocre Sam 22 & 26F cells. 4p 13s might fit inside if not certainly 4p 12s will.
Good genuine li-on cells are a very thin on the ground at the mo, so will have to see who has any stock. My last cells were genuine LG HG2 from a UK warehouse source so may be my next look to see what they have in stock. I had a mail shot a few weeks back to say they have new Molicell stock, Molicell are a Canadian Co. I believe but like all cells most are produced in the Far East or these in Taiwan, Moli's reportedly are very similar if not clones of the VCT5 & 6. They follow similar mah and current stat's.
On Ecf forum Mooch has tested and rates them as best all round 18650 and better the Sony's excellent VTC5A.
Any one used Nkon at all this year ?
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