Battery drain uneven in Parallel Box mod??

[edyle]

Also, since I feel it's related to the thread, I'll mention that NONE of my 3 (batteries in series) box mods drain batteries evenly. I've used a DMM and the volts are always VERY close (like the difference between 4.00 and 4.08) but it still concerns me a bit.

Was thinking this might be because the batteries weren't originally made as a "pair", maybe one was made slightly later than the other? I've always kept them married since the day I got them, and they're decent enough batteries (I've got a pair of Efests and a pair of Samsungs), they've just never matched voltage when I put them in to charge. Kind of odd.

1: To get a handle on whether two numbers are the same of different, look at the PERCENTAGE difference.
In this case 4.00 compared to 4.08 is a difference of 8/400 = 2%

2: To keep batteries matched,
(a) mark the batteries to identify them; in this case 'A', 'B' and 'C'
(b) attempt to have them follow the same usage; use together, charge together, and when you use them, rotate the position in the box so that you don't always have the same battery at the top.

3: batteries are often sold in pairs, so for a set of 3 batts to go in a sigelei 150, I guess you should buy 3 pairs from 1 supplier, so that they're probably from the same manufacturing batch; use 1 set of three while the other set is charging.