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Lead-carbon is the new kid on the block in the consumer battery market.
Perhaps you’ve heard of them but you’re not sure what the hype is or what sets them apart from other batteries?
Lead-Carbon is to Lithium as a Land Rover is to a Ferrari, with AGM comparable to the family run-around. Lithium offers incredible performance but it’s high maintenance, needing support from the BMS to ensure it doesn’t get outside its narrow comfort zone. AGM is durable, but if you push it too low too many times you’ll kill it.
Lead-Carbon can withstand an absolute thrashing and still perform, with higher charge/discharge rates and an extremely long cycle life, they’re simple to install, low maintenance and have better heat tolerance than other batteries on the market.

carbonPLUS were so sure of the performance capabilities of their lead-carbon batteries that in 2023 they offered up one 12v 100Ah as sacrifice for The KILL Test.
We kept the battery on a continuous full-discharge cycle, taking it all the way down to 6v – beyond the manufacturers recommended 100% discharge range to see how long it would last.
To put things into perspective an AGM can survive an average of six cycles down to 6v before its dead. A lithium battery has a BMS because without it, after one cycle down to 6v it would be toast!
The Kill Test began running on Saturday 10th June 2023 after an initial capacity test, out of the box our 12v100ah battery was testing at 138Ah.
We ran a competition asking ‘how many cycles (down to 6v) do you think it will take for our battery to reach its stated 100Ah capacity?’
Results
Our 100Ah Carbon-Plus battery put up an incredible fight enduring 9 months of constant full-discharge cycles before reaching its rated capcity. We didn’t treat the battery very well, during the test there were a couple of long weekends where the battery sat fully discharged. The laptop running the test actually died at one point and yet our trusty battery kept on going.
It became a bit of a joke just how long the battery endured the rough treatment and it really demonstrated just how resilient lead-carbon batteries are.
