Second Hand Battery Packs

Started 3 months ago | Discussions
Colin Creevey Regular Member • Posts: 276
Second Hand Battery Packs

I wasn't planning on buying a battery pack anytime soon but I've seen a second hand Godox LP800X portable battery go up for sale and I am interested in picking it up (if I can get it at a decent price).

I realise that a large part of the item is the battery and I also know that batteries degrade over time. Can anyone give me some advise on how I can/should asses the remaining life of the pack other than looking at how much cosmetic wear and tear there is?

Apologies if this would be better suited in the Accessories Talk forum but considering how niche an item it is I thought it would be more relevant here.

tugwilson Senior Member • Posts: 2,919
Re: Second Hand Battery Packs

Colin Creevey wrote:

I wasn't planning on buying a battery pack anytime soon but I've seen a second hand Godox LP800X portable battery go up for sale and I am interested in picking it up (if I can get it at a decent price).

I realise that a large part of the item is the battery and I also know that batteries degrade over time. Can anyone give me some advise on how I can/should asses the remaining life of the pack other than looking at how much cosmetic wear and tear there is?

Apologies if this would be better suited in the Accessories Talk forum but considering how niche an item it is I thought it would be more relevant here.

Some batteries can be re-celled Might be worth checking with a specialist to see if the LP800X batteries can be refurbished.

It's very difficult to find LP800Xs new at the moment I think that's because Godox is going to replace them with the LP750X . So new LP800X batteries may be hard to come by new.

Gato Amarillo Veteran Member • Posts: 7,201
Re: Second Hand Battery Packs

First question: Are replacement batteries available? My quick search indicates they may be discontinued. If that is the case the pack becomes a real gamble, and the price should reflect that.

As to assessing the battery --

How old is the unit? My search indicated these have been around a few years, so a battery could be nearing the end of its expected life. I would be wary of anything more than a couple of years old.

Li-ion batteries do best with regular use and frequent charging, I would avoid a unit that has spent most of its life in storage and used infrequently, or one that has been used hard every day. You can ask the seller how the pack was used and possibly get some idea.

Deep discharge or overcharging can shorten battery life. A seller may or may not be honest about this.

If replacement batteries are not available it it may be that the pack can be rebuilt by an independent shop, but there is no guaranty of this. You may not know until they open it up and look inside.

Bottom line: To me this is a gamble and I would want a very favorable price.

Gato

Guillermo Shashte Senior Member • Posts: 1,009
Re: Second Hand Battery Packs
1

https://www.adorama.com/elp800x.html

According to the link above, it is a LiFePO4 Battery. These type of batteries have about 25% less energy than similar sized Li-ion but they last a lot longer (about 2000 cycles) and are safer (do not explode).

According to the link, it can power a 100w Halogen lamp for approx. 80 min. Check your test light connected to an AC outlet to see how bright it is. Then test the battery with it.

If you are in the US also consider the Vagabond Mini Lithium.

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GS

Ed Shapiro
Ed Shapiro Regular Member • Posts: 339
Re: Second Hand Battery Packs

There is no simple way that I know of the determine the remaining useful life of any battery.  As batteries age they may not produce as many flashes per charge, they may show no symptoms and just unceremoniously drop dead at the most inopportune times, they may begin to not deliver sufficient voltage to operate the Speedlight.

The way to figure out if you are getting a good deal is to find out what the replacement battery cost, should you need to replace it, and compare it to the cost of the used unit plus that cost as compared to a new battery pack.

It is a private sale, and the seller is honest, he or she will tell you what kind of "milage" they put on the unit.  Some folks buy stuff, don't use it very much and just want to sell it and use the money for something else. Others know the item is approaching the end of its life and just want to unload it.

I am not familiar withte the unit in question, but I can't imagine that a battery could not be replaced unless the part has been entirely discontinued and there is no substitute of the proper voltage and ampere/hour specs that would fit in the pack.

Commercial and Portrait Photographer. Ottawa, Ontario Canada

antares103 Senior Member • Posts: 1,260
Re: Second Hand Battery Packs

Remaining life of the pack is impossible to determine. Just as humans have a life expectancy of around 70-80 years, some pass much too soon, and others live another 40 years.

Lithium batteries have a battery control circuit to disable charging and discharging if a fault is detected. A fault can develop at any time, or there may be one that is marginally below threshold, that can then evolve into an issue.

To determine what capacity is currently available, you can run a known continuous load and see how long it takes for the battery to become fully discharged, and run some math.

LiFePO batteries can also reduce run time if left unused. This capacity can be stretched back to normal or near normal capacities by several charge/discharge cycles.

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OP Colin Creevey Regular Member • Posts: 276
Re: Second Hand Battery Packs

Gato Amarillo wrote:

Li-ion batteries do best with regular use and frequent charging, I would avoid a unit that has spent most of its life in storage and used infrequently, or one that has been used hard every day. You can ask the seller how the pack was used and possibly get some idea.

Deep discharge or overcharging can shorten battery life. A seller may or may not be honest about this.

Right and this is my exact concern.  The seller said they are selling it due to the fact that they never use it.  This leads me to believe that it was used infrequently.

OP Colin Creevey Regular Member • Posts: 276
Re: Second Hand Battery Packs

Ed Shapiro wrote:

Some folks buy stuff, don't use it very much and just want to sell it and use the money for something else. Others know the item is approaching the end of its life and just want to unload it.

The seller has said they are selling it because they don't use it very much so I believe they belong to the prior group.  This being said, I was only interested in the unit because of its competitive price, so I also belong to the group that would probably buy it and not use it much.

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