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VK5ATN > TECH 25.03.06 23:32l 36 Lines 1345 Bytes #999 (0) @ WW
BID : 360024VK5ATN
Read: GUEST DL1LCA
Subj: Re: Paralel Batteries
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Sent: 060320/0107Z @:VK5ZAR.#ADL.#SA.AUS.OC #:37693 [Broadview] $:360024VK5ATN
From: VK5ATN@VK5ZAR.#ADL.#SA.AUS.OC
To : TECH@WW
> This is a wasteful use of battery power, and its probably better to
> simply common them, providing they are of equal capacity throughout
> most of the discharge cycle. Diode isolation is a wasteful way to
> mate two unequal batteries. If you're stuck with unequal batteries,
> solve the problem at the source - replace one or both of them!
>
> 73 de Neil ZL1ANM
I agree.
I used to use isolating diodes once, but they are messy, get hot,
insulation / mounting problems are a real hassle and the voltage drop
factor is always a worry. One or both batteries are never fully charged
unless you try and fool the charging system to raise the cutoff voltage.
Interestingly several recent messages on the excellent HF-Pack internet
group indicate that the use of paralleled SLA batteries (Gel cells) to get
extra current capability from modest and cheap batteries is a widespread
practice.
Connecting LA batteries in parallel works well despite the theoretical
problems which have been raised in this discussion but which seem not to
eventuate in real life.
Of course all of this assumes that you start with two new batteries of
identical brand and capacity, and having connected them, then treat them
as a single unit for the rest of their working life.
73
Terry
VK5ATN
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