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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Agreed.
Diamec are Gel-Cells - My experience is they dont cope with heavy currents (in our out) or mechanical shock at all well.
I dont know for sure, but suspect the Electrolyte Gel probably fizzes a bit or something reducing surface area in contact with the plates, when you push amps through it, The jaycar spec says no more than 5amps charge, which is low for a SLA.
Unlike a wet-cell where the electrolyte just bubbles gas if hammered, or AGM where the electrolyte is "Absorbed into a <fibre>Glass Mat" and pressed against the plate so it cant move easily if things get warm.
Also had (and heard) of them suddenly losing major voltage after impacts - again, suspicion only, but I'm guessing the plates are moving inside the battery, squishing out the gel, and shorting out cells.
The AGM style cant do this, because the mats between the plates act as solid insulators preventing inter-plate contact.
DOSS are Radio Parts cheap chinese brand AGM batteries, but they seem to do pretty well in combat based on our experience prior to moving to NiCds and others.
You can buy them online from http://www.radioparts.com.au/ - The 12v 7Ah bricks are the best ones to get - both power wise, and because they move off the shelves fast (theyre used in lots of things).
If you want another size, or want to make sure you dont get any duds even in 7ah size, I'd visit the city store of Radio Parts in person and ask that the batteries you buy be checked for voltage in front of you before you accept them, since some of the other sizes can sit on the shelf for ages, and if left mostly discharged for ages will sulfate up. Dont accept any batteries with less than ~12.4v on them. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Thu Feb 26, 2009 3:23 am |
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