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Discussion Starter #1
As quite a few people seem to be doing this, I thought I'd post the details.

1) Unlock car, switch off. Remove floor panel in boot. 4 nuts, M10 I think, 1 in each corner.
2) Undo & remove the -ve cable.
3) Remove the vent pipe.
4) Unclip (2 tabs I think) the large plastic fuse-box thing on top of battery and open CAREFULLY.
5) Undo & remove the +ve cable-clamp attaching it to battery, & move it to one side. There's a tricky little clip
thing at the side of the battery at the bottom which needs moving probably.
6) Unclip the plastic fusebox & move it out of the way.
7) There's a hex screw holding the battery-strap to metal below battery, Undo & remove strap.
8) Lift battery out, replace & assembly is the reverse of the above.
 

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I used a Bosch S5 005 battery ordered from here: S5 005 Bosch Car Battery 12V 63Ah Type 027 S5005 - Car Batteries - Bosch Car Batteries

Note that this battery size is ever so slightly less tall than the GM battery; I had to put a magazine underneath to create a shim to ensure it wasn't loose.

I recommend waiting for the car to go into battery save mode before disconnecting the battery (wait for approximately 10 minutes with the boot open until the light goes out) to ensure the computers have all powered down.

For people wanting to leave their Ampera for weeks or months without having to disconnect the battery, have a read of this: Long Term Storage Guide
 

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Not reallly a question of best, its a set of compromises, There is no cold cranking required with this battery the only reason GM used it was because it was readily available and cheap ish. As it's inside the passenger cell that's reallly the only key requirement it to be sure that it meet the standards for that.
 

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Before I saw @Freebird suggestion I was going to suggest an AGM battery. They are needed for any car with start stop technology for example, as they can withstand a greater range of charge than ordinary batteries. It MIGHT be worth the extra if the Amperas suffer from 12v battery problems like the Zoe.
 

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It appears the Volt does use an AGM battery, especially developed for it:
Electric Car Battery | ACDelco EREV

This appears to have been covered quite a bit on this forum and I agree that if the Bosch S5 is EFB it's probably fine for the job.
Thanks for the link Damo, seems this battery was built for the Chevy Volt (it states 'Built specifically to meet the unique demands of the Chevy Volt'). Looks to be US only and I wonder if its for the Volt 2? I will try to find out more before I buy.
 

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AGM batteries are sensitive to over-charging and the recommended bulk and float charge voltages are lower than for flooded type batteries. From what I've seen and read the Ampera regularly sends 15.1v+ to the battery so maybe the flooded Bosch S5 might last better.
 

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Apologies for persisting with this battery quest, I'm hoping for further opinions.
I was about to buy the S5 005 Bosch 12v battery from Tayna, but they have recommended I use the D52 Varta Start-Stop Plus 027 AGM, because its AGM (Advanced Glass Mat).

Lincoln batteries had also pointed out that the original GM battery fitted to the car is AGM and that I should use the same.

I know this may be getting boring but I would appreciate anyone's input, there is a great amount of expertise on the forum which I value. What is holding me back is that two battery specialists have recommended AGM and AGM are the original batteries. As they are more expensive I can't see GM fitting them unless there was good reason.

Thanks

Phil
 

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I understand that we must use AGM and one of the reasons is because it is in the passenger compartment, no acid to fly around during an accident.
That said, all EV's seem to suffer from drastically short Pb battery life. I had an ICE M3 that didn't need it replacing for over 10 years.
Some Tesla Roadster owners have used 12v Lithium packs which seem to last longer and are much lighter. Only around 20Ah but EV's shouldn't need much more, especially if the DC-DC is online.

Both my home builds use 20Ah packs successfully although I am not recommending downsizing the Ampera's.
 

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Discussion Starter #16
Maybe tayna recommend the Varta over Bosch coz it's AGM therefore safe when tipped over, but the Bosch is also safety rated for being tipped over inside a passenger space, unlike most Pb batteries, so no difference there. Several of us have bought the Bosch, so why don't you get the Varta as a comparison? Will take 3+ years to begin to get any idea of any difference tho...
 

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I had installed AGM in my Toyota Prius and also in the BMW 745i . These batteries are just better to recover from a low charge state, which would send the others to the recycle yard lol.
I would install AGM personally
 

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Does anyone have a photo or model/make off the original battery? Ive been asking as a standard question if its been changed and all i get is a "dunno" from dealers.
 
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