You’re confusing maximum output with rated capacity. The OP describes rated capacity of 20AmpHr

 

I am not, In post 21 you stated:

 

Otherwise a battery with say 10ahr capacity is likely to be made from Samsung 25R cells in a 4P - 4 parallel cells

 

As I mentioned the 25R cell is a pucker 20a rated cell and very few 10ah batteries will have these cells inside and more likely will have far inferior/crappier cells then these.

Rob, I’m referring to building your own battery packs not chargers. I’ve used AnnPower (AliExpress) 4 amp chargers for several years without any trouble. I couldn’t build one for the £30-40 they charge for them. Building battery packs is more testing and mechanical engineering (keeping the cells in place) than electronics.

 

My mistake, I'm pretty sure that the cells in my battery are of the inferior variety so I have decided to play safe and go for a 2A charger. I have followed your lead and gone for a metal cased one, with a fan and a fuse on the output made by AnnPower. It claims to be CE compliant but we will take a peak in side just to make sure it looks OK (not possible with a welded plastic case).

 

I will report back once it arrives.

 

Thanks for your help

https://bmsbattery.com/search?controller=search&orderby=position&orderway=desc&search_query=Charger&submit_search=

 

 

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Off topic and possibly stupid post but just want to be certain. The prices on the above site look very reasonable. Many of the chargers say they are suitable for lead acid batteries so would this one for example be suitable for charging a 12v conventional lead acid leisure battery (these are not true deep discharge batteries but can be partially discharged and are used in caravans and boats) ? The label on the one in this link shows that they do a 12v 20A version.

https://bmsbattery.com/ebike-charger-ev-charger/795-s600-300watts-lifepo4li-ionlead-acid-battery-charger.html?search_query=Charger&results=149

Off topic and possibly stupid post but just want to be certain. The prices on the above site look very reasonable. Many of the chargers say they are suitable for lead acid batteries so would this one for example be suitable for charging a 12v conventional lead acid leisure battery (these are not true deep discharge batteries but can be partially discharged and are used in caravans and boats) ? The label on the one in this link shows that they do a 12v 20A version.

https://bmsbattery.com/ebike-charger-ev-charger/795-s600-300watts-lifepo4li-ionlead-acid-battery-charger.html?search_query=Charger&results=149

I have not used BMS Battery and can't vouch for them.My understanding is that when you order you need to specify the battery chemistry (e.g. lead acid) and they will customise the charger to match it.

I have not used BMS Battery and can't vouch for them.My understanding is that when you order you need to specify the battery chemistry (e.g. lead acid) and they will customise the charger to match it.

Thanks Robert. I have since looked at the site again and I was being over cautious and I am sure the chargers would be suitable if I specify the lead acid option. It was all the references to the lithium ion chemistry that put me off. They make the chargers sold by that well known multiple car accessory retailer seem woefully under powered and over priced !