The ACCU 4 ULTRA is a rechargeable Lithium Ion battery that weighs 265g. This battery will run the Ultra for 3 hours 15 mins on full power (120m beam) or 34 hours on economic (40m beam). Petzl say after the battery has been charged for 300 cycles it will have 70% of it's original capacity. If you choose to renew your battery at this point it would have cost 38p per charge cycle for the ACCU 4. You can of course continue to use the battery with reduced capacity. For best performance Lithium Ion batteries are best used regularly.
The ACCU 4 can be used with the standard Petzl Ultra by combining this battery with the extension cord it can replace the ACCU 2 battery to give longer battery life with only a 120g difference in weight.
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