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Chienmortbb

9.6V Rechargeable Batteries

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On 24/08/2019 at 19:14, Chienmortbb said:

My Trustfire also measures a tad over 8.4V fully charged.

Is this your Trustfire?

rBVaSFuYi1SAN2xtAAGDPzhpwK8869.jpg

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I'm tempted to get 4 of these for my bass... certainly cheaper running LEDs on these than pretty much anything else I guess!

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The battery in my jazz bass is behind the pickguard (as you know Russ), I could fit one of those and a USB port to charge the bass somewhere. Hhmmm 

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22 hours ago, stingrayPete1977 said:

The battery in my jazz bass is behind the pickguard (as you know Russ), I could fit one of those and a USB port to charge the bass somewhere. Hhmmm 

Have you got a router bit for your dremmel?

Talking of dremmels, I've got a project for soldering club I'm working on at the moment and could do with some box cutting advice! Sounds like a project night and pie outing!

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I suspect 8.4V is enough for most purposes. I wonder if the rechargeable lithium batteries last longer than non- rechargeable alkalines. It wouldn't surprise me.

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26 minutes ago, stevie said:

I suspect 8.4V is enough for most purposes. I wonder if the rechargeable lithium batteries last longer than non- rechargeable alkalines. It wouldn't surprise me.

Hard to say as no manufacturer, that I know of, publishes battery capacity for non-rechargeable batteries. 

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The trustfire mentioned above looks interesting, I like the idea of charging them with a small USB port rather than having to buy a charger (I don't have any rechargeable batteries in the house yet so buying a bunch of these + a charger is a mess).

Assuming they will rate at 8,4 V as mentioned above, did someone notice any effect on the instrument sound, preamp response, this kind of things?

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On 02/09/2019 at 14:51, stevie said:

I wonder if the rechargeable lithium batteries last longer than non- rechargeable alkalines.

The difference between primary and secondary battery is the discharge curve. Usually a rechargeable (secondary) cell has a curve, that looks a bit like a box: it can push lots of current and steady voltage but only a certain time and then the end comes very quickly.

A common alkaline can push less current and the voltage curve is slowly descending. It is common that a primary cell has bigger capacity: it has not the space for the chemistry that is needed in secondary cells for recharging. So actually a bigger amount of energy in the same space.

This text is a simplification but the basics are there.

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17 hours ago, Sven said:

The trustfire mentioned above looks interesting, I like the idea of charging them with a small USB port rather than having to buy a charger (I don't have any rechargeable batteries in the house yet so buying a bunch of these + a charger is a mess).

Assuming they will rate at 8,4 V as mentioned above, did someone notice any effect on the instrument sound, preamp response, this kind of things?

No difference really - although the higher voltage may give you more headroom and better reproduction of transients.

Anyway, the Trustfire appears to be good... although a tiny bit oversized. It will fit in the Gotoh battery boxes on my basses - but is defo a firm fit where other batteries will quite easily slip in and out. Not a real big issue really though!

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Years ago I bought a couple of specialist over-voltage PP3 type rechargeables, along with the special charging station they needed. This was just to use in an A/B switching pedal.

Unfortunately, in that application they were entirely inappropriate and drained down in less than an hour. ☹️

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