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I've had this a few years on a hybrid and can't fault it: https://cycletraveloverload.com/blackburn-outpost-frame-bag-review/

In the DC 30V to 60V range the spec'd accuracy for the OWON OW18E or Farnell's similar Multicomp MP730624 is good at 0.1%+2 but there are reports the datalogging is hard to use.

Well known brands are a help but haven't always guaranteed quality, so we need to measure. For a spare charger the OEM one could act as reference for a cheap meter and at the right voltage. My meters aren't linear enough to check with a low voltage reference...

> That test is for cells, not a battery with BMS. You've a knack for finding fair points that are easily overlooked :) But assuming the cells don't go madly out of balance.... what might make the results differ / how? The "PSU" is a CV & CC regulator, some have guards such as Ah limits. They...

Yes it's the older version of this and the one I received sets voltage accurately. https://vi.aliexpress.com/item/1005001488070904.html https://www.directcalibrationsolutions.co.uk Calibration can be pricey but I got quick tests over a narrow range and Chris gave a very fair discount.

80%: what would be proof, if not evidence? Here they report test results from BMZ, and my adjustable supply cost £35 much the same as a charger. https://pushevs.com/2018/04/27/battery-charging-full-versus-partial 100% agree that it's great that people are trying to get the details on what's...

True but it's also an investment in safety necessitated by the BMS's balancing threshold being unknown or too high. If you can build a battery with an external balancing port life gets a lot easier. What do they do in China? Are there unbranded charging stations, do they use generic...

> So how do you decide if battery B can be effectivly charged by charger C ? As others have said the right target voltage matters a lot e.g. 10S/13S/14S x LiIon/LiFe/etc, and the current too to some extent, which is what led to this suggestion...

Ripple's a good point, if the battery can't discharge through the charger presumably it goes on charging to the peak voltage including ripple, albeit increasingly slowly. This might be a concern if float charging, which isn't the usual way to charge lithium batteries... although if left...

https://www.ebay.co.uk/itm/126010252383 The cells are very underutilised and checked for balance from time to time. They're charged with a constant current power supply, its ripple can be 300mV but has a narrow spiky waveform so there's little energy in it. By avoiding conditions where...

These are a couple of handheld multimeters. The cheaper one's accuracy varies which is bad news at values away from the voltage reference. Then again the pricier meter's less accurate. I set the charger 0.5V lower to err on the safe side and I'll be treating myself to a better meter...

That one sounds right.

> it is what it is ...and that's ideally not a jelly, if the ratio's really high you can end up with cracks around the nipples:eek: Have a look at my lacing

I used an Andra 40 rim and Sapim Strong spokes with head washers on a Shengyi DGW22C motor. Grin's calculator worked a charm, I measured the rim carefully and the rest fell into place as shown. The wheel's beginning to creak and needs retensioning after 1900 miles.

Although to be fair you can smother a chip pan fire and it takes longer to release its energy. Agreed but ignorance and abuse probably take first place as causes, like indoor charging, unsuitable fast chargers or twist and tape bikes. Good advice so spread the word. Overcharging is a clear...

8 speed? That depends on how many gears your shifters are indexed for (or whether they do friction mode) - your cassette is 7 speed so tell us more. Your derailleur spec will say something like Max. teeth large sprocket 36, Total Capacity 45. Subtract the range of your chainrings (52-28=24?)...

Maybe that steep slope above 4.1V is unique to the 30Q cell, that might account for it losing 3% while other cells lose nearer 10%. https://www.powerstream.com/lithium-ion-charge-voltage.htm

Works for me. You can just see the buttons alongside the display on the far side of the mounting bracket. I've ape arms but the buttons would probably fit on the stem too.

Who said that? "Sounds over complicated" - fair enough it's a thread summary, sorry I missed the bit about live connectors. A combiner's simpler than a controller and if it fails you can connect either battery around it and carry on. Description of sorts here...

Good testing. To recap what's been said up-thread, given that BMS malfunctions aren't uncommon the procedure to link up is: charge both swap chargers and top up both measure difference (because BMSs can differ) switch off both BMS modules fit Y lead working upstream (in case of isolation...